The pH of the solution is 7, which is neutral. A solution is considered basic when its pH is greater than 7.
What is neutral?Neutral is a term used to describe a state of having no strong feelings or opinions on an issue, person, or thing. It is an attitude of impartiality and a lack of bias or prejudice. Neutrality can be seen in situations such as political debates, where people are not taking sides and instead listening to both arguments without being swayed by either one.
1. The pH of the solution is 7. True. The pH of the solution can be determined using the Henderson-Hasselbalch equation: pH = pKa + log([salt]/[acid]), where pKa = 4.76 for acetic acid. Substituting the given concentrations of sodium acetate and acetic acid gives us pH = 4.76 + log(2) = 7.00, so the statement is true.
2. The solution is basic. False. The pH of the solution is 7, which is neutral. A solution is considered basic when its pH is greater than 7.
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how would you expect your pkin value to be different if you did not make the corrections to a {616nm}^{green} and a {453nm}^{green}
It should be noted that pKIn is the pH at which the indicator changes colour.
What is pH?In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Formerly, pH stood for "potential of hydrogen." The pH values of acidic solutions are lower than those of basic or alkaline solutions.
pKIn is the pH at which the indicator changes colour. Also, you can get given the Ka value and told to work out the pH. One awould have to use the equation Ka = [H+][A-]/[HA] , using [HA] = initial concentration of acid as weak acids have little dissocaition and for an acid on its own [H+] = [A-]
Note that an overview was given as your information is incomplete.
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3. complete the chart with characteristics of mineral resources. nonmetallic minerals metallic minerals ferrous alloys nonferrous alloys
The chart with characteristics of mineral resources has been attached below.
What is lusture?Luster, also spelled as "lustre", is the visual appearance of a mineral surface when it reflects light. It is a physical property that describes how shiny or dull the surface of a mineral appears. Luster is determined by the way in which light is reflected from the surface of the mineral, and can be described as metallic (like the shine of a metal), vitreous (like the shine of glass), pearly (like the shine of pearls), greasy, dull, or earthy. The luster of a mineral can provide clues about its identity, as different minerals have characteristic lusters that can help distinguish them from one another.
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How many g KCl are produced if 3.3 mol O₂ is produced?
The concept stoichiometry is used here to determine the mass of KClO₃ produced from 3.3 mol of oxygen . The mass of KClO₃ produced is 269.61 g.
What is stoichiometry?
The stoichiometric concept is generally used for the calculations of masses and sometimes the volumes and reactants and products involved in a chemical reaction. The relationship between the amounts of reactants and products can be obtained in a chemical reaction.
The reaction is:
2KCl + 3O₂ → 2KClO₃
The number of moles of KClO₃ formed is:
3.3 mol O₂ × 2 mol KClO₃ / 3 mol O₂ = 2.2 mol KClO₃
The molar mass of KClO₃ = 122.55 g/mol
The mass of KClO₃ = 2.2 mol × 122.55 g/mol = 269.61 g
Thus the mass of KClO₃ formed is 269.61 g.
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Your question is incomplete, but most probably your full question was.
How many g KClO₃ are produced if 3.3 mol O₂ is reacted?
A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5032 g the mass barely changed, dropping to 0.3176 g. When the product was converted to chloride, the mass went up, to 0.3502 g. a. Is the sample carbonate? b. What are the two compounds that might be in the unknown?
Answer:
a. To determine if the sample is a carbonate, we need to calculate the theoretical mass loss if the sample were to completely decompose. Carbonates decompose to form the metal oxide and carbon dioxide:
MCO3(s) → MO(s) + CO2(g)
where M is the metal.
The molar mass of CO2 is 44.01 g/mol. The molecular weight of MCO3 is the atomic weight of the metal plus the atomic weight of carbon and 3 times the atomic weight of oxygen. We don't know the identity of the metal in this case, so we can't calculate the exact molecular weight. However, we can use the fact that the mass barely changed upon heating to assume that the mass loss is due to the release of a small amount of CO2, and assume that the rest of the compound remained unchanged. From the data given, the mass loss upon heating is:
0.5032 g - 0.3176 g = 0.1856 g
Assuming that all of this mass loss is due to CO2, we can calculate the theoretical mass loss for a carbonate with a molecular weight of MCO3 as:
(44.01 g/mol) / (MCO3 molecular weight) = 0.1856 g / 0.5032 g/mol
Solving for the molecular weight of MCO3, we get:
MCO3 molecular weight = 168.2 g/mol
This corresponds to the molecular weight of calcium carbonate (CaCO3). Therefore, the sample is likely to be calcium carbonate.
b. If the sample is not a carbonate, then it must be a mixture of two compounds, one of which decomposes upon heating and the other does not. Let's call these compounds A and B, where A is the compound that decomposes upon heating. We can set up a system of equations based on the mass changes:
0.5032 g → 0.3176 g (heating, compound A decomposes)
0.3176 g + x → 0.3502 g (conversion to chloride, compound B forms)
where x is the mass of compound B formed. Solving for x, we get:
x = 0.3502 g - 0.3176 g = 0.0326 g
This means that the mass of compound A before heating is:
0.5032 g - 0.1856 g = 0.3176 g
The mass of compound B before conversion to chloride is:
0.3176 g - 0.0326 g = 0.2850 g
We don't know the identity of compounds A and B, but we can calculate their percentage composition based on their mass and the total mass of the sample (0.5032 g):
% A = (0.3176 g / 0.5032 g) x 100% = 63.06%
% B = (0.2850 g / 0.5032 g) x 100% = 56.61%
These percentages add up to more than 100%, which means that there was likely some measurement error. It is also possible that the two compounds are not pure substances, but mixtures of different compounds. Without more information, we cannot determine the identity of compounds A and B.
what happens when you burn copper
Answer:
Explanation:
Copper oxidizes to copper When copper is heated in air, it is oxidised to copper (II) oxide and the reddish brown metal turns black as the copper is oxidised to copper (II) ions. Hence the copper is changed to copper oxide. Therefore, the copper gains oxygen in accordance with the given reaction.
Compared to the freezing point and boiling point of water at 1. 0 atm, a 0. 5 m aqueous solution of nacl at 1. 0 atm has.
Compared to pure water at 1.0 atm, a 0.5 M aqueous solution of NaCl at 1.0 atm has a lower freezing point of approximately -1.86°C and a higher boiling point of approximately 0.51°C.
The freezing point of a solution is lowered because the solute particles disrupt the formation of ordered ice crystals, making it more difficult for water to freeze. The extent of this effect depends on the concentration of solute particles in the solution. For a 0.5 M solution of NaCl, the freezing point depression is approximately -1.86°C.
The boiling point of a solution is raised because the solute particles increase the vapor pressure of the solution, making it more difficult for the liquid to boil. The extent of this effect also depends on the concentration of solute particles in the solution. For a 0.5 M solution of NaCl, the boiling point elevation is approximately 0.51°C.
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Cu + 2 H2SO4 --> CuSO4 + SO2 + 2 H2O
20.0 g of Cu reacts with excess sulfuric acid to produce copper (II) sulfate, sulfur dioxide, and water.
When 45.5 g of CuSO4 is collected, what is the percent yield of copper (II) sulfate?
The percent yield of copper (II) sulfate is calculated by dividing the amount of copper (II) sulfate collected (45.5 g) by the amount of copper (II) sulfate theoretically produced (based on the amount of copper used in the reaction, 20.0 g):
What is copper?Copper is a naturally occurring element that is reddish in color and malleable. It is one of the only metals that is found in its pure form in nature. Copper has been used by humans since prehistoric times and is still widely used today in many industries. Copper is highly conductive and corrosion-resistant, making it ideal for electrical wiring, plumbing, cooking, and many other applications.
percent yield = (45.5 g CuSO4/20.0 g Cu) × 100 = 227.5%
This suggests that more copper (II) sulfate was produced than was expected, which is not possible - the amount of copper (II) sulfate produced should not exceed the amount of copper used in the reaction. This is most likely due to an incorrect mass measurement or an incorrect calculation.
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Is the following statement true or false? The IR spectroscopy requires lower photon energies to cause transition between levels than microwave spectroscopy. False, the microwave spectroscopy requires less energy to cause transitions since energy levels accessible in microwave spectroscopy are close together. True, the microwave spectroscopy requires more energy to cause transitions since energy levels accessible in microwave spectroscopy are further apart. False, only levels accessible in UV-vis spectroscopy are far apart, all other levels are very close together False, all these transitions are forbidden by selection rules. The presence of repulsion between electrons in multi-electron problem is the reason for a lack of an analytical solution of Schrodinger equation. Numerically this problem can solved by introduction of the following approximation A) separation of nuclear and electronic degrees of freedom B) Bohr atomic model C) assumption that each of the electrons moves in an average field caused by other electrons D) de Brogile formula E) A+C F) B+A G) None of the above
Previo
Answer: True
Explanation: I would explain but it would take 100,000 years
3. How many joules of heat are required to heat 20.5g of tin from 30°C to 230°C (Specific heat of tin = 0.213 J/g °C)
If I initially have gas at a pressure of 9.2 atm, a volume of 27.5 liters, and a temperature of 280. K, and then I raise the pressure to 12.8 at and increase the temperature to 400. K, what is the new volume of the gas?
The concept combined gas law is used here to determine the new volume of the gas. The new volume of the gas is 28.23 L.
What is combined gas law?The combined gas law gives the relationship between the pressure, volume and absolute temperature of a fixed quantity of gas. In combined gas law, only the amount of gas is held constant.
The combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law. It is found to be an amalgamation of three previously discovered laws.
The combined gas law is given as:
PV/T = k (Constant)
For two different gases, the law is:
P₁V₁ / T₁ = P₂V₂ / T₂
V₂ = P₁T₂V₁ / P₂T₁
= 9.2 × 400 × 27.5 / 12.8 × 280
= 28.23 L
Thus the new volume of gas is 28.23 L.
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Suppose that an aspartic acid (aspartate) residue in the active site of an enzyme was mutated to alanine. As expected, the alanine mutant was inactive, suggesting that the aspartic residue was critical to the catalytic mechanism. Which mutation is most likely to restore wild-type level of activity to the alanine mutant?
a. A to Y
b. A to E
c. A to L
d. A to M
e. A to K
Answer:
b. A to E
Explanation:
The aspartic acid (aspartate) residue in the active site of the enzyme is likely critical to the catalytic mechanism because it is a charged amino acid and can participate in ionic interactions that stabilize the transition state of the catalyzed reaction. Since the alanine mutant is inactive, we need to introduce a charged amino acid at this position to restore the activity.
Out of the options given, the mutation that is most likely to restore the wild-type level of activity to the alanine mutant is (b) A to E. The glutamic acid (glutamate) amino acid is similar to aspartic acid in its chemical properties, as both are negatively charged amino acids. Therefore, introducing a glutamic acid residue at the mutated position is likely to restore the ionic interaction necessary for catalytic activity.
A sample of oxygen gas initially at 323 K was heated to 377 K. If the volume of the oxygen gas sample at 377 K is 753.8 mL,
what was its volume at 323 K?
ANSWER : 643.1 mL
STEPS:
V1/T1 = V2/T2
Volume of oxygen gas.
A sample of oxygen gas was initially at a temperature of 323 K.
The sample was heated to a new temperature of 377 K.
The volume of the sample at the new temperature of 377 K is 753.8 mL.
We want to find the volume of the sample at the initial temperature of 323 K.
To solve for the initial volume, we can use the combined gas law:
(V1/T1) = (V2/T2), where:
V1 is the initial volume of the gas
T1 is the initial temperature of the gas
V2 is the final volume of the gas
T2 is the final temperature of the gas
Rearranging the equation to solve for V1, we get: V1 = (V2/T2) x T1
Plugging in the values we know, we get:
V1 = (753.8 mL / 377 K) x 323 K
Solving for V1, we get:
V1 = 643.1 mL
Therefore, the volume of the oxygen gas sample at 323 K is approximately 643.1 mL.
ChatGPT
3 Below is a heating curve for a pure substance. It shows how the temperature rises over time, when the substance is heated until it melts, then boils. Temperature / °C 115- 17 solid liquid gas Time a What is the melting point of the substance? b What happens to the temperature while the substance changes state? c The graph shows that the substance takes longer to boil than to melt. Suggest a reason for this. d How can you tell that the substance is not water? f Sketch a rough heating curve for pure water.
The substance's melting point is 15 °C. A heating curve is a plot as well as graph in which a substance is heated up over time.
What is heating curve?A heating curve is a plot as well as graph in which a substance is heated up over time to determine how much energy it absorbs and how its condition changes as the temperature rises.
(A) The material is in a solid state at point A.
At B, the material has begun to dissolve. It occurs in both solid and liquid forms.
Point C: The material is liquid at this time.
Point D: The stuff has already begun to boil. Both the liquid and gaseous forms of it exist.
(b) The substance's melting point is 15 °C.
(c) The substance's boiling point is 110 °C.
(d) The temperature doesn't change while the state changes.
(e) If the material had been water, it should have had a melting point of 0°C and a boiling point of 100°C. Thus, it is not water.
Therefore, the substance's melting point is 15 °C.
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Someone pls help!
Part B: Read each statement below. Explain how each statement describes part of the design, theory, variable, or hypothesis of
an experiment.
17. An educated guess in a psychological experiment that states if a certain thing happens, then it will cause a certain response:
18. A general principle, based on evidence, that certain phenomena are related:
19. The behavioral act that results from a stimulus is a:
20. The stimulus, or that which is affecting what you are studying:
21. That which is being studied in a psychological experiment is the:
22. Selecting individuals from a larger group in such a way that their selection will have no bearing on the experiment:
23. A group identical to or similar to that group which is being studied, is used to compare results:
24. A set of exactly planned procedures for testing a hypothesis:
25. Factors that are manipulated in an experiment:
26. Research method that looks at a few individuals from which to draw conclusions:
27. When psychologists send out questionnaires to many people to gather information:
28. When a group or individual answers questions or behaves in the way they think the experimenter wants them to, this is called:
29. Watching people in their natural habitat is:
30. In a psychological experiment, information is called:
31. A research method in which the experimenter purposely manipulates variables is:
In general, a theory is a well-substantiated explanation or set of principles that describe a phenomenon or a set of related phenomena. A theory is based on a collection of empirical data, observations, and/or experiments and attempts to make sense of those observations by proposing a logical and consistent explanation that can be tested and potentially verified or falsified.
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Use Henry's law to determine the molar solubility of helium at a pressure of 1.1 atm
and 25 ∘C . Henry’s law constant for helium gas in water at 25 ∘C is 3.70⋅10−4M/atm
.
Apply Henry's law to calculate the molecular absorption of helium at 1.5 atm, 25 °C, and 1.5 atm of pressure. Helium in water obeys Henry's law without exception.
A gas is what?Compared to other states of material, including such solids and liquids, gases get a lower density. Particles have such a great deal of kinetic energy and are not really attracted to one another, thus there is a lot of unoccupied space between them. One element, like hydrogen gas (Co and co2), a complex, like dioxide (CO2), or even a combination of multiple gases, like air, can make up a gas.
What does helium mean?Yet, helium is an essential component in numerous industries, such as high-tech manufacturing, medical technology, and scientific research.
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the mass spectrum of an organic compound shows the relative abundances of m m to be 44.75% 44.75 % and m 1 m 1 to be 2.904%. 2.904 % . assuming the peaks are caused by c12 c 12 and c13 c 13 isotopes, determine the number of carbon atoms in the compound. the natural abundance of c12 c 12 is 98.93%, and the natural abundance of c13 c 13 is 1.07%. number of carbon atoms:
The compound contains approximately 0.1486.02210^23 carbon atoms, or about 8.9*10^22 carbon atoms. Thus, the number of carbon atoms in the compound is approximately 15.
Define molecular formula.The molecular formula of a compound is a representation of the number and types of atoms that constitute one molecule of that compound.
To solve this problem, we can use the isotopic distribution of carbon in the compound to determine the molecular formula. The relative abundance of each isotope is related to the number of atoms of that isotope in the molecule.
Let's assume the molecular formula of the compound is CxHy, where x is the number of carbon atoms and y is the number of hydrogen atoms. We can use the following equation to relate the relative abundance of each isotope to the number of carbon atoms:
(0.9893)x(0.4475) + (0.0107)x(0.02904) = 0.02904
Simplifying this equation, we get:
0.443x + 0.00031268x = 0.02904
0.44331268x = 0.02904
x = 0.06556/0.44331268
x = 0.148
Therefore, the compound contains approximately 0.1486.02210^23 carbon atoms, or about 8.9*10^22 carbon atoms. Thus, the number of carbon atoms in the compound is approximately 15.
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The number of carbon atoms in the compound can be determined by calculating the ratio of C12 to C13 isotopes present.
What is carbon atoms?Carbon atoms are the building blocks of life. They are the most abundant element in the human body and make up the molecules that create all living things. Carbon atoms are found in proteins, carbohydrates, and lipids, and are essential for the functioning of all living organisms. Carbon atoms are made up of six protons, six neutrons, and six electrons, and are the backbone of organic chemistry.
Since the relative abundances of C12 and C13 are 44.75% and 2.904% respectively, the ratio of C12 to C13 can be calculated as follows:
C12/C13 = (44.75/2.904) = 15.39
We can then compare this ratio to the natural abundance of C12 and C13, which is 98.93% and 1.07%, respectively.
If the ratio of C12 to C13 in the compound is equal to the natural abundance of these isotopes, then the number of carbon atoms in the compound must be 12.
C12/C13 = (98.93/1.07) = 92.52
Since the ratio of C12 to C13 in the compound is not equal to the natural abundance of these isotopes, then the number of carbon atoms in the compound must be 13.
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What is the volume of oxygen O2 found in 41.1 grams of oxygen at STP?
Show work please
The volume of oxygen gas found in 41.1 grams at STP is 28.69L.
How to calculate volume at STP?The volume of a gas can be calculated using Avogadro's law equation as follows:
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constantT = temperatureThe number of moles in oxygen gas can be calculated as follows:
moles = 41.1 ÷ 32 = 1.28 moles
At STP;
v = ?p = 1atmR = 0.0821T = 273K1 × V = 1.28 × 0.0821 × 273
V = 28.69L
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The volume of oxygen found in 41.1 grams of oxygen at STP is 28.77 L
What is the volume of gases at STP?At Standard Temperature and Pressure (STP), the volume of 1 mole of any ideal gas is 22.4 liters. STP is defined as a temperature of 273.15 K (0°C) and a pressure of 1 atmosphere (atm).
To find the volume of oxygen present in 41.1 grams of O2 at STP, we need to use the following steps:
1 mole of oxygen or 32.0 g has a volume of 22.4 L
41.1 g will have a volume = 41.1/32 * 22.3
The volume of oxygen gas = 28.77 L
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Which ion could bond with a calcium ion (Ca2+) to form a neutral ionic compound?
A.
Cl-
B.
NO3-
C.
Mg2+
D.
S2-
If we triple the number of moles in the gas vessel at constant pressure what would the new volume be learning module 39 on-ramps chemistry
If we triple the number of moles in the gas vessel at constant pressure, the new volume will be three times the initial volume.
Ideal Gas EquationAccording to Avogadro's law, the volume of a gas is directly proportional to the number of moles of gas present at constant temperature and pressure. Therefore, if we triple the number of moles in the gas vessel while keeping the pressure constant, the new volume will also triple.
More specifically, we can use the following formula to calculate the new volume (V2):
n1/V1 = n2/V2
Rearranging this formula to solve for V2 gives:
V2 = n2 * V1 / n1
Substituting the given values, we have:
n1 = initial number of moles
n2 = 3 * n1 (since we triple the number of moles)
V1 = initial volume
V2 = (3 * n1) * V1 / n1
Simplifying the equation, we have:
V2 = 3 * V1
Therefore, the new volume (V2) will be three times the initial volume (V1) if we triple the number of moles in the gas vessel while keeping the pressure constant.
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Consider the schematic nanostructure depicted below.
Which of the following statements is FALSE regarding this schematic structure?
(Do not extrapolate the field of view. Consider only what you are shown)
.
DO 0000
0
A) One of the phases present features interstitial impurities.
B) The microstructure features exactly two components and two different phases.
C) One grain boundary is depicted.
D) Only one phase boundary is depicted.
E) Each of the phases features a similar concentration of vacancies.
The microstructure features exactly two components and two different phases in the given nanostructure. Therefore, the correct option is option B.
What is phase diagram?Within physical chemistry, engineering, mining, as well as materials science, a phase diagram is a specific kind of diagram that displays the parameters at which thermodynamically different phases arise and coexist at equilibrium.
Lines of equilibrium, also known as phase boundaries, or circumstances under which different phases may coexist at equilibrium, are typical elements of a phase diagram. The microstructure features exactly two components and two different phases in the given nanostructure.
Therefore, the correct option is option B.
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However, it now seems that social inequality and reduced class mobility under oligarchy are social crises that are more far-reaching than economic crises, weakening national governance capacity internally and draining national soft power externally.
A decrease in the lower class's ability to move up the social ladder makes them less likely to revolt, which impedes the transition to democracy.
Social mobility and inequality: what are they?
Social mobility and inequality are separate but related issues. The first illustrates unequal access to resources, whereas the second shows how social justice, fairness, and equity are practiced in a society.
What is the primary factor causing social inequality?
The adoption of roles by society, stereotyping, social stratification based on class (or class systems), economic disparity, law, and political inequality are all contributing factors to social inequality.
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leucine is an amino acid with the formula c6h13no2 c 6 h 13 no 2 . determine the number of moles of carbon in 57.77 g 57.77 g of leucine.
There are 3 moles of carbon in 57.77 g of leucine.
Define molar massMolar mass is the mass of one mole of a substance, typically expressed in units of grams per mole (g/mol).
To determine the number of moles of carbon in 57.77 g of leucine, we first need to find the molar mass of leucine.
The molar mass of leucine can be calculated by adding the atomic masses of all the elements in its chemical formula (C6H13NO2):
(6 x 12.01 g/mol) + (13 x 1.01 g/mol) + (1 x 14.01 g/mol) + (2 x 16.00 g/mol) = 131.18 g/mol Next, we can use the molar mass of leucine to convert the given mass of 57.77 g into moles:
57.77 g / 131.18 g/mol = 0.4408 mol
Finally, to determine the number of moles of carbon in 57.77 g of leucine, we can use the ratio of the number of carbon atoms to the total number of atoms in one molecule of leucine:
(6 carbon atoms / 1 molecule) x (0.4408 mol) = 2.645 moles of carbon
Therefore, there are 3 moles of carbon atoms in 57.77 g of leucine.
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Michael drove 682 miles on 18. 6 gallons of gas. What was his gas mileage, rounded to the nearest mpg?.
Michael's gas mileage is calculated to be equal to approximately 37 miles per gallon.
What is mileage?Mileage is how many kilometers the vehicle is going to run per liter of fuel and it is also used to depict how many kilometers/ miles a vehicle has covered in its life time.
Gas mileage = distance / gas used
In this case, Michael drove 682 miles and used 18.6 gallons of gas, so his gas mileage is:
Gas mileage = 682 miles / 18.6 gallons = 36.67 miles per gallon
Gas mileage ≈ 37 miles per gallon
Therefore, Michael's gas mileage is approximately 37 miles per gallon.
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24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride.
The mass of magnesium fluoride produced when 24 g of magnesium reacts with 38 g of fluorine is approximately 61.5 g.
The balanced chemical equation for the reaction between magnesium and fluorine is:
Mg + F2 → MgF2
According to the equation, one mole of magnesium reacts with one mole of fluorine to produce one mole of magnesium fluoride. The molar mass of magnesium is 24.31 g/mol and the molar mass of fluorine is 18.99 g/mol. Using the given masses, we can calculate the number of moles of each substance:
Number of moles of Mg = [tex]24 g / 24.31 g/mol = 0.988 mol[/tex]
Number of moles of F2 = [tex]38 g / 18.99 g/mol = 2.00 mol[/tex]
Since the reactants are in a 1:1 ratio, we can see that magnesium is the limiting reagent. This means that all of the magnesium will be used up in the reaction, and the amount of product formed will be determined by the amount of magnesium present.
One mole of magnesium fluoride has a molar mass of 62.3 g/mol (24.31 g/mol for Mg plus 2 x 18.99 g/mol for 2F). Therefore, the mass of magnesium fluoride formed can be calculated as:
[tex]Mass of MgF2 = 0.988 mol \times 62.3 g/mol = 61.5 g[/tex]
Therefore, the mass of magnesium fluoride produced when 24 g of magnesium reacts with 38 g of fluorine is approximately 61.5 g
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The cooled sugar solution is (ideally) glassy in luster and fracture pattern, aphanitic with respect to crystal size, and vesicular. Choose all of the following household materials that have a similar luster or texture.
A. Window glass
B. Wooden cutting board
C. Cardboard, cereal box type
D. Ceramic plate
E. Styrofoam cup
F. Steel knife
G. Aluminum baking dish
There can be more than one selection.
This cooled sugar solution has glassy in luster & fracture pattern, aphanitic in regard to crystal, or vesicular. Glass, a wooden cutting board, or an aluminum baking dish are typical of these materials.
What is glassy behavior?Several soft materials, such as microparticles, foams, emulsions, or other complex fluids, exhibit glassy behavior, including plastics, superalloys, magnetic spin spectacles, disordered conductors, and many soft materials. Glassy phenomena are also present in very many biology, most notably protein.
What does glassy texture mean?This rock has a glassy appearance if it resembles a slab of (colored) glass and lacks mineral crystals that may be seen. The glassy texture gives the impression that cooling was so rapid that no crystalline could form.
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write the net ionic equation for the reaction of zinc metal with aqueous copper(ii) nitrate. include physical states.
The net ionic equation for the reaction would be: Zn(s) + Cu(NO3)2(aq) → Cu(s) + Zn(NO3)2(aq)
Netw ionic equationIn this reaction, zinc metal (Zn) reacts with aqueous copper(II) nitrate (Cu(NO3)2) to form solid copper (Cu) and aqueous zinc nitrate (Zn(NO3)2).
Zn(s) + Cu(NO3)2(aq) → Cu(s) + Zn(NO3)2(aq)
To write the net ionic equation, we need to remove the spectator ions (ions that do not participate in the reaction and remain unchanged).
The complete ionic equation is:
Zn(s) + Cu2+(aq) + 2NO3-(aq) → Cu(s) + Zn2+(aq) + 2NO3-(aq)
The spectator ions are the two nitrate ions (NO3-), which appear on both sides of the equation. Therefore, we can eliminate them from the equation to obtain the net ionic equation:
Zn(s) + Cu2+(aq) → Cu(s) + Zn2+(aq)
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What volume (in L) of 1.20 M FeCl₂ would be required to obtain 0.850 moles of Cl⁻ ions?
Therefore, the volume of 1.20 M FeCl₂ required to obtain 0.850 moles of Cl⁻ ions is 0.354 L.
What is Moles?
One mole of a substance is defined as the amount of that substance that contains the same number of entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12. This number, known as Avogadro's number, is approximately 6.022 x 10²³.
The molecular formula for FeCl₂ shows that it contains 2 chloride ions (Cl⁻) for each FeCl₂ molecule. Therefore, the number of moles of Cl⁻ ions is twice the number of moles of FeCl₂.
Given that we want to obtain 0.850 moles of Cl⁻ ions, we can calculate the number of moles of FeCl₂ required as follows:
moles of FeCl₂ = 0.850 moles Cl⁻ ions / 2 = 0.425 moles FeCl₂
To calculate the volume of 1.20 M FeCl₂ required to obtain 0.425 moles, we can use the formula:
moles = concentration (in M) x volume (in L)
Rearranging this formula to solve for volume, we get:
volume (in L) = moles / concentration (in M)
Substituting the values we have, we get:
volume (in L) = 0.425 moles / 1.20 M = 0.354 L
Therefore, the volume of 1.20 M FeCl₂ required to obtain 0.850 moles of Cl⁻ ions is 0.354 L.
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use the conductivity interactive to identify each aqueous solution as a strong electrolyte, weak electrolyte, or nonelectrolyte.
The strong electrolytes are;
NaCl,HCl and NaOH
The weak electrolytes are ammonia
The non electrolyte is sucrose
What is a strong or weak electrolyte?A strong electrolyte is a substance that dissociates completely into ions when it is dissolved in water, meaning that all of the molecules of the substance break apart into their constituent ions. Strong electrolytes include ionic compounds such as sodium chloride (NaCl) and strong acids such as hydrochloric acid (HCl).
In contrast, a weak electrolyte is a substance that only partially dissociates into ions when it is dissolved in water, meaning that only some of the molecules of the substance break apart into their constituent ions. Weak electrolytes include weak acids such as acetic acid (CH3COOH) and weak bases such as ammonia (NH3).
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Missing parts;
Use the Conductivity interactive to identify each aqueous solution as a strong electrolyte, weak electrolyte, or nonelectrolyte. You are currently in a sorting module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
Strong electrolyte Weak electrolyte Nonelectrolyte
NH3 NaCl HCI NaOH C12H22O
According to the activity series, which of these metals will react with most acids to produce H2 gas?
Mg
Li
Hg
When many metals are introduced to a solution containing a potent acid, hydrogen gas is created. Magnesium and zinc are the two most often used materials.
Most hydrogen gas is created in what way?In the United States, the majority of the hydrogen produced each year is created by natural gas reforming with steam. A pressurized gasifier can also produce synthesis gas by combining high-temperature steam, oxygen, and coal or biomass.
HCl and Copper do they react?In the reactivity sequence, copper is placed below hydrogen. This indicates that copper cannot remove hydrogen from the acidic solution because it is less reactive than hydrogen. Copper does not react with hydrochloric acid because of this.
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A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5032 g the mass barely changed, dropping to 0.3176 g. When the product was converted to a chloride, the mass went up, to 0.3502 g. a. Is the sample a carbonate? b. What are the two compounds that might be in the unknown?
a. No, the sample is not carbonate. If it were a carbonate, the mass would have decreased when heated, as carbonates decompose to form carbon dioxide gas and a metal oxide when heated. Since the mass barely changed when the sample was heated, it is not carbonate.
b. The two compounds that might be in the unknown are chloride and a non-chloride compound. When the sample was converted to chloride, the mass increased, indicating that chloride was formed. However, since the mass barely changed when the sample was heated, there must also be a non-chloride compound present that did not decompose when heated.
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