The balanced chemical equation for the reaction of hydrogen with iron oxide is:
3H2 + Fe3O4 -> 4Fe + 4H2O
From the equation, we can see that 3 moles of hydrogen are required to react with 1 mole of iron oxide.
Therefore, to completely react with 3 moles of iron oxide, we need:
3 moles of H2 x (1 mole Fe3O4 / 3 moles H2) = 1 mole Fe3O4
Since 1 mole of Fe3O4 requires 3 moles of H2, we need:
3 moles of H2 x 1 mole Fe3O4 = 3 moles of H2
Therefore, the answer is 3 moles of hydrogen (H2).
calculate the number of atoms of chlorine atoms contained in 0.20g of DDT
Answer: look at the image for the answer and the explanation
Explanation:
How many moles of nitrogen gas are produced when 36.0 g of NH4NO3 reacts?
The balanced chemical equation for the decomposition of NH4NO3 is:
NH4NO3(s) → N2(g) + 2H2O(g)
what is the molar mass of NH4NO3 ?
The molar mass of NH4NO3 is 80.04 g/mol, which means that 1 mole of NH4NO3 has a mass of 80.04 g.
To find the number of moles of N2 produced, we first need to determine how many moles of NH4NO3 are present in 36.0 g:
moles of NH4NO3 = mass / molar mass
moles of NH4NO3 = 36.0 g / 80.04 g/mol
moles of NH4NO3 = 0.4498 mol
According to the balanced equation, 1 mole of NH4NO3 produces 1 mole of N2. Therefore, the number of moles of N2 produced is also 0.4498 mol.
The balanced chemical equation for the decomposition of NH4NO3 is:
NH4NO3(s) → N2(g) + 2H2O(g)
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A chunk of unidentified element, (element "X"), is reacted with nitrogen to form an ionic compound with the chemical formula X3N2. Which of the following elements is the most likely identity of X? a. Se b. Ba c. K d. Al e. Cl
The correct answer is b. Ba.
To determine which element is the most likely identity of X, we can use the valency of nitrogen and the formula of the ionic compound X3N2.
Nitrogen has a valency of 3-, which means it forms an ion with a charge of -3. Therefore, in the ionic compound X3N2, the total charge of the cations (X3+) must be equal to the total charge of the anions (2N3-).
We can write the equation to express this relationship as:
3X+ + 2N3- → X3N2
Since the compound contains three X cations and two N anions, the cation X must have a charge of +2 to balance the overall charge of the compound.
From the list of elements given, only Ba (barium) has a 2+ charge, which makes it the most likely identity of X. Therefore, the correct answer is b. Ba.
What is nitrogen?
It is a nonmetal and makes up about 78% of Earth's atmosphere, by volume. Nitrogen is the most abundant element in Earth's atmosphere and is chemically inert under normal conditions. It is an essential element for life as it is a component of amino acids, proteins, and nucleic acids such as DNA.To know more about nitrogen, click the link given below:
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What do weather fronts separate?
a
the troposphere and mesosphere
b
air masses of different densities
c
the troposphere and stratosphere
d
air masses of different altitudes
Different-density air masses are divided by weather fronts. A weather front is an area of difference in temperature, moisture content, and density between two air masses.
What are weather fronts and air masses?A weather front is a place on the planet's surface where two different air masses collide. Where two different air masses converge, or at a front, turbulence usually occurs.
The mesosphere is split in what ways?The region where the mesosphere and thermosphere converge is known as the mesopause. Near the base of the mesosphere is the stratopause, which delineates the boundary between the stratosphere and the mesosphere.
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which one of the following is not true concerning automotive air bags? group of answer choices they are inflated as a result of a decomposition reaction. the two products of the decomposition reaction are sodium and nitrogen.
The correct statement regarding the products of the decomposition reaction in automotive airbags is that they are sodium metal (Na) and nitrogen gas (N2).
What is Decomposition?
Decomposition is a chemical reaction in which a compound is broken down into smaller molecules, atoms, or ions. It is the opposite of a synthesis reaction, where smaller reactants combine to form a larger product.
In a decomposition reaction, a single reactant is broken down into two or more products. The reactant may break apart into its constituent elements, or it may break down into simpler compounds. For example, the decomposition of water (H2O) into hydrogen gas (H2) and oxygen gas (O2) is a common example of a decomposition reaction.
Automotive airbags work by inflating rapidly during a collision to provide a cushioning effect for the occupants of the vehicle, and they do so as a result of a chemical reaction. Specifically, the reaction involves the decomposition of sodium azide (NaN3) into nitrogen gas (N2) and sodium metal (Na), which is a highly exothermic reaction.
The reaction occurs when an electrical charge is sent through a wire filament, which heats up and ignites a small amount of solid propellant containing sodium azide. The resulting reaction produces a large volume of nitrogen gas that inflates the airbag.
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which of the following molecules has the lowest vapor pressure between ch4, c6h13nh2, ch3oh, c5h11oh
Answer:
ch3oh
Explanation:
The vapor pressure of a liquid is inversely proportional to its boiling point. The lower the boiling point, the higher the vapor pressure.
Out of the given molecules, CH4 (methane) has the lowest boiling point (-161.5°C) and hence, the highest vapor pressure.
C6H13NH2 (hexylamine), CH3OH (methanol), and C5H11OH (pentanol) all have higher boiling points than methane and lower vapor pressures.
Of these three, methanol (CH3OH) has the lowest boiling point (-64.7°C) and hence the highest vapor pressure, making it the molecule with the lowest vapor pressure out of the given options.
When sodium (na) and chlorine (cl) are combined, a small amount of table salt is formed and a bright yellow light and a lot of heat are given off. Does it take more energy to break the bonds of the reactants, or is more energy released when forming the bonds of the products? how do you know?(1 point).
Since a lot of heat is produced during the bond- forming process of the products, further energy is released during that process than is frequently the case.
A more accurate dimension of energy use and position is thermal energy. As bonds are broken in the reactants during exothermic processes, further energy is released when the bonds are created in the products. An increase in the response admixture's temperature is a specific of exothermic responses. The term" endothermic" refers to chemical responses that generally absorb( or use) energy. When bonds in the reactants are broken, further energy is absorbed than is released when new bonds are generated in the products. This is known as an endothermic response. As the response's temperature drops, endothermic processes are endothermic.
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It takes more energy to break the bonds of the reactants than to form the bonds of the products. This is because of the Law of Conservation of Energy,
Which states that energy cannot be created or destroyed, only transferred from one form to another. When the reactants undergo a chemical reaction, the bonds between the atoms break and the energy that was stored in those bonds is released in the form of heat and light. This energy is then used to form the bonds between the atoms of the products. This process requires less energy than the breaking of the bonds of the reactants, so overall more energy is released than was used to break the bonds.
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Describe how you would prepare each of the following aqueous solutions, starting with solid KBr: (a) 0.75 L of 1.5 x 10^-2 M KBr, (b) 125g of 0.180m KBr, (c) 1.85 L of a slouotion that is 12.0% KBr by mass (the density of the solution is 1.10 g/mL) (d) a 0.150 M solution of KBr that contains just enough KBr to precipitate 16.0g of AgBr from a solution containing 0.480 mol of AgNO3
Moles of KBr = Mass/Molar mass = 10.5g/119g/mol = 0.088 mol. Now, Molarity=moles of KBrVolume of the solution in liter. M o l a r i t y = m o l e s o f K B r V o l u m e o f t h e s o l u t i o n i n l i t e r .
What is the volume of the solution made when 500 mL of a 2.4 M KCl answer is diluted to a 1.0 M solution?1200 mL will be the closing extent of the solution.
However, seeing that there may be already 500 mL of answer present, you only need to add 700 mL of water to get 1200 mL as your last volume. The answer: seven hundred mL.
What mass of KBr is wanted to produce 300g of a answer that is 3.00% by mass?QUESTION 13 What hundreds of KBr and water are wished to produce 300. g of a solution that is three p.c by using mass? 9.00 g of KBr and 300.
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determine if each statement about the molecule in the reaction below is true or false. phosphoenolpyruvate is a product (click to select) mg 2 ion is a cofactor (click to select) pyruvate kinase is an enzyme (click to select) pyruvate is a substrate (click to select)
Phosphoenolpyruvate is a substrate (false), Mg2+ ion is a cofactor (true), pyruvate kinase is an enzyme (true), pyruvate is a product (true).
What is Ion?
An ion is an atom or molecule that has a non-zero net electrical charge due to the loss or gain of one or more electrons. If an atom loses electrons, it becomes a positively charged ion, known as a cation, whereas if it gains electrons, it becomes a negatively charged ion, known as an anion. Ions play important roles in many chemical and biological processes, such as in the conduction of electricity in nerves and muscles, the regulation of pH in blood, and the formation of chemical bonds.
"Phosphoenolpyruvate is a product" - This statement is false. Phosphoenolpyruvate is a substrate, meaning it is the starting molecule that undergoes a chemical reaction to produce a product, which in this case is pyruvate.
This statement is true. Mg2+ ion is a cofactor required for the activity of pyruvate kinase enzyme. It acts as a cofactor by binding to the enzyme and playing a key role in catalyzing the chemical reaction.
This statement is true. Pyruvate kinase is an enzyme that catalyzes the transfer of a phosphate group from phosphoenolpyruvate to ADP, resulting in the formation of pyruvate and ATP.
"Pyruvate is a substrate" - This statement is true. Pyruvate is the product formed by the chemical reaction between phosphoenolpyruvate and pyruvate kinase enzyme.
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step 5: draw the structure that best fits the mass spec data. let's review the results of the previous steps. step 1: the molecular ion is 27 . step 2: there are no cl or br atoms based on isotope pattern. step 3: the molecular ion is odd, so there is one nitrogen. now consider step 4 as it relates to the unknown compound. step 4: examine the largest peaks and calculate the difference from the molecular ion. look for common alkyl fragments. the mass spec data shows only one base peak at m/z 27, and a smaller peak at 26, so there are no alkyl fragments. one nitrogen atom will have a molecular weight of 14, leaving 13 amu for the remaining unknown portion. a molecular weight of 13 amu can only correspond to one carbon atom and one nitrogen atom, giving the molecular formula of chn .
According to the information provided, the unidentified molecule has the molecular formula CHN, which equals a molecular weight of 13 amu. This suggests that the molecule has one carbon atom and one nitrogen atom.
there are no cl or br atoms based on isotope patterns.We may infer from the mass spectrum that the molecule is neither a branched nor substituted alkane because there are no alkyl fragments seen there. The base peak at m/z 27, which is the compound's molecular ion, is the only peak seen in the spectrum.
As it relates to the unknown compound.A molecule with a single carbon atom and a single nitrogen atom coupled by a triple bond has the structure that best fits the mass spec data. This is equivalent to the cyanide molecule, which has the chemical formula H-C-N.
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Which of the following statements is true regarding Personal Protective Equipment (PPE) and hazardous substances?
PPE can help to minimize direct exposure to hazardous chemicals.
It is your employer's responsibility to provide your PPE.
You should wear any and all protective equipment that is recommend for your job.
All of these are correct.
The examples of Personal Protective equipment include items like gloves, foot, body suits and eye protection. All the given options are correct regarding PPE. The correct option is D.
What is Personal Protective Equipment?The Personal Protective Equipment is generally referred to as PPE and it is the equipment which is used to minimize the exposure to a variety of hazards substances. The injuries and illnesses can be caused from contact with physical, electrical and mechanical hazards.
All the personal protective equipment should be safely designed and constructed and it should be maintained in a clean and reliable fashion.
Thus the correct option is D.
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The term aromatic is a structural term that applies to cyclic conjugated molecules that are planar and lack alkene like reactivity due to enhanced resonance stabilization. Which of the following compounds is not classified as an aromatic compound?
An aromatic compound is cyclohexadiene
What is an aromatic compound?An aromatic compound is a type of organic compound that contains a ring of atoms with alternating double bonds, known as an aromatic ring or an arene. The most common and well-known example of an aromatic compound is benzene, which has a ring of six carbon atoms with alternating double bonds.
Aromatic compounds are characterized by their unique chemical and physical properties, including their stability. They are know to be planar and lack alkene like reactivity due to enhanced resonance stabilization.
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A compound will not be classified as aromatic if it is not cyclic, planar, or, have a continuous ring of pi electrons that follows Hückel's rule.
Aromatic compoundsAn organic compound would not be classified as an aromatic compound if it does not meet the criteria for being an aromatic compound.
The criteria for being an aromatic compound include being:
cyclicplanarhaving a continuous ring of pi electrons that follows Hückel's rule.If an organic compound is not cyclic or planar, or if it does not have a continuous ring of pi electrons that follows Hückel's rule, then it would not be classified as an aromatic compound.
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Select Strong Acid as the analyte and Phenolphthalein as the indicator in the titration interactive. To the tenths place, determine the volume of titrant added at each of these points. Indicator No Indicator colorless 14 equivalence point: 25.1 mL 7 end point: 14 ml pH = 0.00 0 50 25 Titrant Added (mL) Suppose that you did not know the concentration of the acid. Use the end-point volume, the concentration of the base, and the volume of the acid to calculate the concentration of the acid.
The concentration of the acid would be Molarity of acid is 0.55952 M
What is acid?Acid is a type of chemical compound that has a sour taste and can cause corrosive damage to materials. Acids are often used as cleaning agents and are found in many everyday products, such as vinegar and lemon juice. Acids are also found in nature, such as in the form of rainwater. When acid reacts with a base, it creates a neutralized solution, which is known as a salt. Acids have a pH level that is less than 7 and bases have a pH level that is higher than 7. Acids can be strong or weak depending on the concentration of hydrogen ions in the solution. Strong acids are highly corrosive, while weak acids are less reactive.
The concentration of the acid can be determined by using the following equation:
Molarity of acid = (Volume of base (mL) * Concentration of base (M) )/ Volume of acid (mL)
In this case, the concentration of the acid would be calculated as follows:
Molarity of acid = (14 mL * 1 M )/ 25.1 mL = 0.55952 M
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which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, hcoo-
The odd one out is Structure C, which essentially possesses none of the traits of a significant resonance structure.
Which resonance structure from the list below makes the biggest contribution to the resonance hybrid?The resonance hybrid will be most influenced by the resonance form with the lowest formal charges. In a molecule, an atom is given a formal charge. The resonance structure is more stable as formal charges decrease.
Which of the following resonance structures is the least stable?The negative charge on the carbon atom connected to the NH2 group, which is an electron donor by nature, makes Structure (A) the least stable resonant structure and will lead the molecule to become unstable.
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A sheet of gold weighing 11.1g and at a temperature of 15.7°C is placed flat on a sheet of iron weighing 18.7g and at a temperature of 52.6°C. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings.
Be sure your answer has the correct number of significant digits.
The final temperature of the combined metals is 34.9°C.
What is specific heat?Specific heat is the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin). It is a physical property that is unique to each substance and is often denoted by the symbol "c."
To solve this problem, we can use the principle of heat transfer, which states that when two objects with different temperatures come into contact, up until they reach the same temperature, heat will transfer from the hotter to the cooler object.
We can start by using the formula for heat transfer:
Q = m * c * ΔT
where Q is the amount of heat transferred, m is the mass of the object, c is the specific heat capacity of the material, and ΔT is the change in temperature.
Let's assume that the final temperature of the combined metals is T. We can set up two equations based on the heat transferred from the gold and the heat transferred to the iron:
Heat transferred from the gold: Q1 = (11.1 g) * (0.129 J/g°C) * (T - 15.7°C)
Heat transferred to the iron: Q2 = (18.7 g) * (0.449 J/g°C) * (T - 52.6°C)
Since the total amount of heat transferred must be equal, we can set Q1 = Q2:
(11.1 g) * (0.129 J/g°C) * (T - 15.7°C) = (18.7 g) * (0.449 J/g°C) * (T - 52.6°C)
Simplifying and solving for T, we get:
T = [ (11.1 g) * (0.129 J/g°C) * 15.7°C + (18.7 g) * (0.449 J/g°C) * 52.6°C ] / [ (11.1 g) * (0.129 J/g°C) + (18.7 g) * (0.449 J/g°C) ]
T = 34.9°C
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Match each scientific method term to its definition.
Answer:
✿´`·.·´`✿What are the 7 steps in a scientific method and its definition?
Image result for Match each scientific method term to its definition.
The six steps of the scientific method include: 1) asking a question about something you observe, 2) doing background research to learn what is already known about the topic, 3) constructing a hypothesis, 4) experimenting to test the hypothesis, 5) analyzing the data from the experiment and drawing conclusions, and 6)
How many grams are there in 7.4 x 1023 particles of MgO?
MgO particles have a mass of 7.4 x 1023 grams.
What does a gram of a molecule mean?According to Wikipedia, "a gram molecule can be defined as the amount of a substance equal to its relative molecular mass in grams." One gram of water, for instance, weighs 18 grams (H 2 O = 1 + 1 + 16 = 18 g).
1 m converted to moles?The most common unit used in chemistry to express molarity is the number of moles per liter, represented by the unit sign mol/L or mol/dm3 in SI units. One molar, or 1 M, of a solution's concentration is defined as one mol/L.
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What must happen for a nucleus to be stable?
OA. The strong nuclear force must balance electrostatic forces in the
nucleus.
B. The electrostatic force must be stronger than the strong nuclear
force.
OC. The number of protons must be greater than the number of
neutrons.
D. The number of neutrons must be greater than the number of m
quarks.
Neutron-to-proton ratios of at least and even numbers of protons and neutrons are characteristics of stable nuclei. It is common for particularly stable nuclei to have protons and neutrons in magic numbers.
Protons and electrons: what are they?A subatomic particle having a negative charge is an electron. A strong nuclear force keeps protons together in the nucleus of an atom. A particular subatomic particle without no charge is the neutron.
What materials make up neutrons?Neutrons are made up of one up quark and three down quarks. This "strong nuclear force," one of the four basic forces, keeps the nucleus together. Two more are gravity and electromagnetism.
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Answer:its a
Explanation: bc im just him
A 30. 5 gram sample of glucose (c6h12o6), mm~180 g/mol) contains __________ atoms of carbon.
A 30.5 gram sample of glucose contains 6.1×10²³ atoms of carbon.
Firstly we will calculate the number of moles and then use Avogadro's constant to find the number of atoms.
So, the number of moles of glucose will be calculated by the formula -
Number of moles = mass ÷ molar mass
Number of moles = 30.5/180
Performing division on Right Hand Side of the equation
Number of moles = 0.169 moles
As we know, one mole of any molecule contains Avogadro's number of atoms.
So, 0.169 moles of glucose will contain 6.02×10²³ atoms
Now, 1 mole of glucose will contain 6 carbon atoms. Thus, number of carbon atoms = 6.02×10²³×6×0.169
Number of carbon atoms = 6.1×10²³
Thus, there are 6.1×10²³ atoms.
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Determine whether each of the following represents a physical property or a chemical property:
(a) Chlorine gas has a greenish-yellow tint.
(b) The density of water at 4°C is 1.000 g/mL.
(c) Hydrogen gas is very flammable.
(d) Aluminum is a solid at 25°C.
(e) Water is colorless and odorless.
(f) Lemon juice tastes sour.
(g) Gold does not tarnish.
(h) Copper cannot be decomposed.
Each item on the list below has been mapped to the physical or chemical property below.
Physical and Chemical properties(a) Chlorine gas has a greenish-yellow tint : Physical Property
(b) The density of water at 4°C is 1.000 g/mL: Physical Property
(c) Hydrogen gas is very flammable: Chemical Property
(d) Aluminum is a solid at 25°C: Physical Property
(e) Water is colorless and odorless: Physical Property
(f) Lemon juice tastes sour: Chemical Property
(g) Gold does not tarnish: Physical Property
(h) Copper cannot be decomposed: Chemical Property
The features of a substance that can be viewed and quantified without altering the substance's identity are called its physical attributes. Color, density, hardness, melting and boiling points, and electrical conductivity are a few examples of physical qualities.
Chemical attributes refer to a substance's qualities that describe its capacity for chemical transformation. Chemical characteristics include things like flammability, reactivity, and toxicity.
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A chemistry teacher provides students with the amount of potassium hydroxide they need in solution form. The teacher makes the solution by dissolving 42. 1 g koh into 3. 0 l of solution.
Answer:For the enough dissolving of given moles each group will need to provide 92mL of solution.
Explanation: Molarity can be calculated as: M=n/V mol/L where, V=volume=3L(given)
n=no. of moles, which can be calculated as:
n=W/M, where
W= given mass=42.1g(given)
M=molar mass= 56.1g/mol (known)
We have to calculate molarity to determine the volume of solution of each groups. By putting value of n in the 1st equation, molarity can be calculated as M=42.1/56.1x3=0.250 mol/L.
It is given that each group has KOH solution of 0.023 moles. So, we can calculate the volume by using the 1st equation. M=n/V
0.250=0.023/V
V=0.023mol/0.250mol per L=0.092L=92ml
92ml of the solution will each group need to provide enough dissolved moles.
What is the energy of a 9,330 cm wave
Answer:
Explanation:
To calculate the energy of a wave, we need to know its frequency and other relevant parameters. However, in this case, only the wavelength of the wave is given, which is 9,330 cm. We cannot determine the energy of the wave using only this information.
To calculate the energy of a wave, we would need to use the formula E = hν, where E is the energy of the wave, h is Planck's constant, and ν is the frequency of the wave. The frequency can be calculated by dividing the speed of light by the wavelength.
So, without the frequency of the wave, it's not possible to calculate its energy.
Phosgene is a substance that is often used to make the padding found in car and airplane seats. It is produced when carbon monoxide and chlorine gas react. Consider the following reaction: 1 molecule of carbon monoxide (CO) reacts with 1 molecule of chlorine (Cl₂) to produce some amount of phosgene (COCI₂). To find the amount of phosgene produced, first determine the number of each type of atom in the products. Hint: During a chemical reaction, atoms are not created, destroyed, or changed from one chemical element to another. Chemical element Number of atoms in reactants Number of atoms in products 1 1 2 C O CI
Phosgene is produced by the reaction; CO + Cl2 --> COCl2
What is the reaction that produces Phosgene ?Though your question is unclear, it revolves around the formation of phosphagen.
Phosgene is a highly toxic gas that is used in the production of a variety of chemicals, including pesticides, pharmaceuticals, and dyes. It is produced by the reaction of carbon monoxide (CO) and chlorine (Cl2) in the presence of a catalyst. The reaction can be represented by the following equation:
CO + Cl2 --> COCl2
This reaction is highly exothermic and typically requires a catalyst such as activated carbon, iron, or nickel to proceed at a reasonable rate. The process of producing phosgene is highly dangerous and requires careful handling and safety measures to prevent accidental release of the toxic gas.
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which of the following statements is not true? view available hint(s)for part r which of the following statements is not true? a ketone reacts with a peroxyacid to form an ester. a primary amine reacts with a ketone to form an imine. an aldehyde reacts with sodium borohydride followed by addition of acid to form a primary alcohol. a tertiary amine reacts with a ketone to form an enamine. a ketone reacts with a phosphonium ylide to form an alkene.
The molecules having C=O bond are called carbonyl compounds. Among the given statements, a tertiary amine reacts with a ketone to form an enamine is not true. The correct option is D.
What is amine?The organic compounds which contain nitrogen atoms with a lone pair are called the amines. In general they are derived from ammonia in which one or more 'H' atoms is replaced by an alkyl or aryl group.
The tertiary amines do not react with aldehydes and ketones to produce stable products. They have no 'NH' hydrogens and therefore cannot even form carbinolamines. But with primary amines ketones form imines and enamines with secondary amines.
Thus the correct option is D.
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Your question is incomplete, but most probably your full question was:
which of the following statements is not true?
A. a ketone reacts with a peroxyacid to form an ester
B. a primary amine reacts with a ketone to form an imine
C. an aldehyde reacts with sodium borohydride followed by addition of acid to form a primary alcohol
D. a tertiary amine reacts with a ketone to form an enamine
E. a ketone reacts with a phosphonium ylide to form an alkene
What charge will be the result of an atom that had 5 electrons at first and then gains 3 electrons?
5 electrons , then gains 3 so it will be 8 electrons total and when it gains electrons the charge should be -3 so the element u have will have a -3 charge .
short explanation;If an atom or molecule gains an electron, it becomes negatively charged (an anion).
Brief explanation:Carbanions have 5 valence electrons and a formal charge of 1−. Two other possibilities are carbon radicals and carbenes, both of which have a formal charge of zero.
NOTE:If an object has more protons than electrons, then the net charge on the object is positive. If there are more electrons than protons, then the net charge on the object is negative. If there are equal numbers of protons and electrons, then the object is electrically neutral.
MEMORIZE THAT!! ☝️☝️the outer most shell of an atom is called the valane shell. the number of electrons in this shell determines ________.
What is the molarity of solution if 42.1 grams of KOH is dissolved in 3.0 L of solution?
Answer:
the molarity of the solution is 0.25 M.
Explanation:
To calculate the molarity of a solution, we need to know the amount of solute in moles and the volume of the solution in liters.
The first step is to calculate the amount of KOH in moles using its molar mass. The molar mass of KOH is the sum of the atomic weights of potassium (39.1 g/mol), oxygen (16.0 g/mol), and hydrogen (1.0 g/mol):
Molar mass of KOH = 39.1 g/mol + 16.0 g/mol + 1.0 g/mol = 56.1 g/mol
The amount of KOH in moles is:
moles of KOH = mass of KOH / molar mass of KOH
moles of KOH = 42.1 g / 56.1 g/mol
moles of KOH = 0.750 moles
Now that we know the amount of KOH in moles, we can calculate the molarity of the solution:
Molarity = moles of solute / liters of solution
Molarity = 0.750 moles / 3.0 L
Molarity = 0.25 M
Therefore, the molarity of the solution is 0.25 M.
Answer: 9.23 moles of solute
Explanation: It's a hard explanation so you can just have the answer.
consider the two compounds shown. both compounds have two adjacent chiral carbons. the first chiral center is r in both compounds. the second chiral center has a wedged bond to hydrogen and dashed bond to hydroxy in compound 1 and the opposite configuration in compound 2. indicate the relationship of the pair of compounds. enantiomers identical diastereomers consider another pair of compounds. both compounds are 4 carbon chains with a hydroxy group on carbons 1 and 4. compound 1 has a wedged bond to hydroxy on carbon 2 and a dashed bond to hydroxy on carbon 3. compound 2 has a dashed bond to hydroxy on carbon 2 and a wedged bond to hydroxy on carbon 3. indicate the relationship of the pair of compounds. identical diastereomers enantiomers
The first pair of compounds are diastereomers. The second pair of compounds are enantiomers.
What is enantiomer?Enantiomers are pairs of molecules that are non-superimposable mirror images of each other. They are stereoisomers, which means that they have the same molecular formula and sequence of bonded atoms, but differ in the three-dimensional orientation of their atoms in space. Enantiomers have identical physical and chemical properties, except for the direction in which they rotate plane-polarized light and their interactions with other chiral molecules, such as enzymes and receptors.
Here,
In the first pair of compounds, the two adjacent chiral carbons have the same R configuration. However, the configuration of the second chiral carbon is different in the two compounds. In compound 1, the wedged bond is attached to hydrogen and the dashed bond is attached to hydroxy, while in compound 2, the opposite configuration is present. Therefore, these two compounds are diastereomers.
In the second pair of compounds, both compounds have the same hydroxy groups on carbons 1 and 4, but the configuration of the hydroxy groups on carbons 2 and 3 is different. In compound 1, the hydroxy group on carbon 2 has a wedged bond, and the hydroxy group on carbon 3 has a dashed bond, while in compound 2, the opposite configuration is present. Since these two compounds have opposite configurations at all chiral centers, they are enantiomers.
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Calculate the average mass from the data set 1 5.455 2 5.495 3 5.453
The average mass from the given data set is approximately 5.4677.
What is average mass?An indicator of the central tendency of a collection of data reflecting item masses is average mass. It is also referred to as the arithmetic mean and is determined by adding the masses of all the objects in a dataset and dividing the result by the total number of objects in the dataset. In order to give a general idea of the normal mass of the objects in the collection, the average mass is employed. It is extensively employed in a variety of industries, including engineering and scientific research. In statistics, the idea of average mass is crucial since it allows for the conclusion- and decision-making-based analysis of big datasets. It offers a summary metric that is helpful for contrasting various data sets.
To calculate the average mass from the data set, we need to add up all the masses and then divide by the number of masses.
Adding up the masses:
5.455 + 5.495 + 5.453 = 16.403
Dividing by the number of masses (which is 3 in this case) gives us the average mass:
16.403 / 3 = 5.46766666667 (rounded to 11 decimal places)
Therefore, the average mass from the given data set is approximately 5.4677.
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How many atoms make up 2.7 moles of Titanium?
Answer:
Approximately 1.62894 x 10^24 atoms.
Explanation:
To determine the number of atoms in 2.7 moles of titanium, we need to use Avogadro's number, which is the number of atoms in one mole of an element.
Avogadro's number is approximately 6.022 x 10^23. This means that one mole of any substance contains 6.022 x 10^23 particles (atoms or molecules).
The molar mass of titanium is approximately 47.87 g/mol.
To calculate the number of atoms in 2.7 moles of titanium, we can use the following formula:
number of atoms = (number of moles) x Avogadro's number
number of atoms = 2.7 moles x 6.022 x 10^23 atoms/mole
number of atoms = 1.62894 x 10^24 atoms
Therefore, 2.7 moles of titanium contains approximately 1.62894 x 10^24 atoms.
Answer: 23 atoms
Explanation:
1 mole is 6.02x10
1 mole = atomic mass