To find the number of neutrons in an atom, you need to know the atomic number and a mass number of the element.
The atomic number is the number of protons in the nucleus of an atom and determines the identity of the element. The mass number is the sum of the number of protons and the number of neutrons in the nucleus of an atom.
So in general, to find the number of neutrons in an atom, you can use the following formula:
Number of neutrons = Mass number - Atomic number
It's important to note that isotopes of the same element have different numbers of neutrons. Therefore, the number of neutrons in an atom will vary depending on the specific isotope.
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what is the oxidation number of each oxygen atom in hooh?
Answer:(-1)
Explanation: Assuming HOOH has a neutral charge, hydrogen is always a +1 charge. In order to make it neutral each oxygen would have a charge of an oxidation number of -1
Correctly Identify Boyle's Law to explain the shower phenomenon where curtains are affected when using a shower
Boyle's Law states that at a constant temperature, the pressure of a gas is inversely proportional to its volume, which can explain why shower curtains are affected when using a shower due to the decrease in air pressure in the shower space.
What is the shower phenomenon, and why does it cause shower curtains to move inward when the water is turned on?The shower phenomenon refers to the movement of a shower curtain towards the shower when the water is turned on. This is caused by the decrease in air pressure in the shower space due to the flow of water from the showerhead. This decrease in pressure causes the higher atmospheric pressure outside of the shower to push the curtain inward.
How does Boyle's Law apply to the shower phenomenon, and what other real-world applications can it be used to explain?Boyle's Law can be used to explain the shower phenomenon by showing that the decrease in air pressure inside the shower space causes the curtain to move inward, as the pressure outside the shower remains constant. This law can also be used to explain other phenomena such as the behavior of gases in a scuba tank, the operation of a bicycle pump, and the changes in volume and pressure of the lungs during respiration.
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Write a scientific claim answering the question: How does bamboo provide the materials and energy for a panda to grow and function? Use evidence from the previous tasks to support your claim and apply scientific reasoning to show why this evidence supports your claim.
Answer:
The scientific claim is that bamboo provides the materials and energy for a pandas to grow and function due to its high nutritional content. Bamboo is known to be high in fiber, protein, and carbohydrates and has been observed as the main source of nutrition for pandas in the wild. Additionally, the Berlin Airlift provided evidence that the US and its allies were willing to provide humanitarian aid to support West Berlin's citizens and this demonstrates that bamboo can be effectively transported and used as a reliable source of nutrition. Furthermore, the principle of containment also provides evidence that Bamboo is capable of providing the necessary materials and energy for a panda to grow and function because it has been observed as the primary source of nutrition for this species. Thus, the facts that bamboo is rich in nutrients and can be transported effectively indicates that it is an important factor in providing the materials and energy for a panda to grow and function.
Scientific Claim: Bamboo provides the necessary materials and energy for a panda to grow and function by being a highly nutritious food source that contains the necessary nutrients, such as protein, carbohydrates, and fiber, as well as providing energy through its high caloric content.
Evidence:
Pandas are herbivores and primarily feed on bamboo, with over 99% of their diet consisting of bamboo.Bamboo has a high nutrient content, containing protein, carbohydrates, fiber, and other essential nutrients that are necessary for a panda's growth and survival.Bamboo has a high caloric content, which provides the energy needed for a panda's daily activities, including growth and reproduction.Scientific reasoning:
The evidence from previous tasks supports the claim that bamboo provides the necessary materials and energy for a panda to grow and function. As herbivores, pandas rely on a plant-based diet, with bamboo being the primary food source. Bamboo is a highly nutritious food source, containing the necessary nutrients, such as protein, carbohydrates, and fiber, that are essential for a panda's growth and survival.
which of the following statements regarding exergonic reactions are true? multiple select question. exergonic reactions are spontaneous. exergonic reactions have a positive change in free energy. exergonic reactions release energy during product formation. the products of an exergonic reaction have a higher free energy than the reactants.
Exergonic reactions release energy during product formation.
What are exergonic reactions?Exergonic reactions are chemical reactions that release energy as they occur. In an exergonic reaction, the reactants contain more potential energy than the products, and the excess energy is released into the environment.
Exergonic reactions are important in many biological processes, such as cellular respiration, where energy is released from the breakdown of glucose to power the cell's activities.
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How many grams of oxygen gas would be needed to react completely with 9.76 moles of iron according to the equation below? Please round your answer to two digits after the decimal point and don't forget units and substance! Fe + O2 --> Fe2O3
Fe + O₂ → Fe₂O₃
19.52 moles of oxygen gas would be needed to react completely with 9.76 moles of iron according to the equation.
What is oxygen gas?Oxygen gas is a form of oxygen (O2) that exists as a gas at standard temperature and pressure. It is an important component of the Earth's atmosphere, making up 21% of the air we breathe.
Oxygen is produced by photosynthesis in plants and by the process of respiration in animals. In addition, oxygen is used in many industrial processes, such as welding and other forms of combustion. Oxygen is also used in medical applications, such as in oxygen therapy and in medical devices such as ventilators.
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The quantity of grams of oxygen gas that will be needed to react completely with 9.76 moles of iron according to the equation above would be = 624.64g
How to calculate the quantity of carbon?From the above equation;
1 mole of Fe reacted with 2 moles of oxygen
9.76 moles of Fe would react with X moles of oxygen.
That is;
1 mole Fe = 2 moles oxygen
9.76 mole Fe = X moles of oxygen
Make X the subject of formula;
x = 9.76× 2
X = 19.52 moles of oxygen.
But 1 mole of oxygen = 32 g
19.52 moles = X
Make X the subject of formula:
X = 32×19.52 = 624.64g.
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what type of plot can be used to determine λmax of a solution?
A. Absorbance vs. volume
B. Absorbance vs. wavelength
C. Absorbance vs. concentration
D. Absorbance vs. transmittance
A plot of absorbance vs. wavelength can be used to estimate a solution's maximum concentration.
How would you choose the analysis's wavelength?Recordings of the absorbance are made between the wavelengths of 350 and 650 nm, often at spacing of 25 nm. You may graph the data to see where the highest absorbance is, or you can look at the pairs of data to work out the wavelength.
What the slope says How about a plot based on Beer's Law?Beer's law is an equation for a straight line that has the general type of y = mx + b, where m is the slope and l is the angle of the slope. In this instance, determine c, using the absorbance discovered for your unknown together with the slopes of your best-fit line.
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what is the numerical ratio of the rate of change in the concentration of co2 to the rate of change in the concentration of o2
The numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2 depends on the specific conditions and context being considered.
Numerical ratio explained.
The numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2 depends on the specific conditions and context being considered. However, in general, the ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2 can provide insights into various biological, ecological, and atmospheric processes.
For example, in the process of cellular respiration, the ratio of CO2 produced to O2 consumed is 1:1, meaning that the rate of change in the concentration of CO2 is equal to the rate of change in the concentration of O2.
In contrast, during photosynthesis, plants and other autotrophs take in CO2 and release O2. The ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2 during photosynthesis depends on various factors such as the type of plant, the amount of light and nutrients available, and the surrounding temperature and humidity.
Therefore, the numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2 varies depending on the specific context and conditions being considered.
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what is an observation chem 107
The next general chemistry subject is CHEM 107: General College Chemistry II, which comes after CHE 105. Due to the heavy math and extensive equation memorization required, some individuals find CHEM 107 to be more difficult than CHE 105.
Fundamentals of Chemistry, or CHEM 107, is a required subject for students majoring in allied health, engineering, or science. It examines general chemistry topics. States of matter, atomic structure, the periodic chart, bonds, nomenclature, chemical reactions, chemical equations, and quantitative connections are some of the subjects covered. The target audience for this course is primarily students planning to enroll in more advanced chemistry classes. CHEM 108 functions as the supplementary lab for students who require one. 1 hour of recitation and 3 lesson hours each week. Every autumn and spring, as well as possibly during additional sessions, the course is offered.
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what is extraction as practiced in the organic chemistry laboratory?
Answer:Option B ( No longer supports the latest results
Explanation:
For the gas phase reaction, C2H4+ H2 C2H6 (A H=-ve) carried out in a closed vessel, the efficiency of reaction can be increase by:
A. Increasing the temperature
OB. Decreasing the pressure
C. Removing some reactants
D. Adding some C2H4
Answer:
A. Increasing the temperature.
When naming a compound The first element is?
While naming a compound, the less electronegative element is written first in the formula.
Generally, the less electronegative element is written first while writing the formula, though there are a few exceptions. Basically, carbon is always written first in a formula and hydrogen is after nitrogen in a formula such as NH₃. The common order of common non-metals in binary compound formulas is C, P, N, H, S, I, Br, Cl, O, F.
Generally, electronegativity is defined as a chemical property which describes the tendency of an atom or a functional group to attract electrons toward itself. The electronegativity of an atom is basically affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei. And the more electronegative element is written in the first name of the compound.
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According to Dalton's Law of Partial Pressures, the pressure of oxygen in dry air would be
The pressure of the oxygen in the air is 0.21 atm. The partial pressure of a gas is the contribution that gas makes to the total pressure when the gas is part of a mixture.
calculate the number of molecules in 1 mole of calculated oleic acid.
There are approximately 6.022 x 10²³ molecules in 1 mole of oleic acid.
What is Avogadro's number?Avogadro's number is a fundamental constant used in chemistry and physics to quantify the number of particles, such as atoms or molecules, in one mole of a substance. It is named after Italian scientist Amedeo Avogadro, who first proposed in 1811 that equal volumes of gases at the same temperature and pressure contain the same number of particles.
The value of Avogadro's number is approximately 6.022 x 10²³. This means that one mole of a substance, which is defined as the amount of the substance that contains as many particles as there are atoms in 12 grams of pure carbon-12, contains 6.022 x 10²³ particles.
Oleic acid has a molecular formula of C18H34O2. One mole of oleic acid contains Avogadro's number (6.022 x 10²³) of molecules.
To calculate the number of molecules in one mole of oleic acid, we need to first find the molar mass of oleic acid.
The molar mass of oleic acid is:
(18 x 12.01 g/mol for carbon) + (34 x 1.01 g/mol for hydrogen) + (2 x 16.00 g/mol for oxygen)
= 282.47 g/mol
one mole of oleic acid has a mass of 282.47 grams and contains Avogadro's number of molecules:
1 mole x 6.022 x 10²³ molecules/mole = 6.022 x 10²³ molecules
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is gas a homogeneous mixture
Yes all gases are homogenous mixture.
A homogeneous mixture is defined as a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample. It remains uniform in throughout the composition. Basically, there is only one phase of matter observed in a homogeneous mixture.
Generally, in all types of gas mixtures, each component in the gas phase can be treated separately. Each component present in the mixture shares the same temperature and volume. (We must remember that the gases usually expand to fill the volume of their container; gases in a mixture also do that.) However, each gas always has its own pressure.
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Why are DNA fingerprints considered a reliable form of evidence?
Because only a very small amount of human remains left over after a crime may be necessary to identify someone, DNA profiles are particularly helpful in forensics.
What makes DNA fingerprinting so trustworthy?The molecule that makes up genes is called DNA, and the fingerprinting method is based on the idea that each person has a unique DNA pattern. Scientists can identify individual variances by breaking up DNA and lining up the resulting fragments to look for differences in fragment length.
Why is DNA less dependable than fingerprints?DNA profiles would not be necessary for identification or security purposes because regular fingerprints currently serve as complete identification and are much more likely to be found in connection with security breaches than blood samples that can be used for DNA analysis.
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why the rf value of a substance is always less than 1
The RF (retention factor) value is a measure of how strongly a compound adheres to the stationary phase in a chromatographic column.
What is chromatographic column ?A chromatographic column is a device used in chromatography that helps separate mixtures of different compounds. It is composed of a tube, typically made of glass or stainless steel, that is filled with a packing material such as silica, alumina, or polymer beads. The compound mixture is then loaded onto the column and a solvent, typically referred to as the mobile phase, is pumped through the column. As the solvent passes through the column, it carries the compounds in the mixture with it, and the compounds are separated based on their affinity for the packing material. The compounds then travel through the column at different rates, allowing them to be collected separately from the mobile phase.
It is calculated by dividing the retention time of the compound by the retention time of the solvent. Since the solvent will always have the shortest retention time, the RF value will always be less than 1.
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To cause cancer, proto-oncogenes require 1 (or) 2 allele(s) to be mutated and are therefore considered dominant (or) recessive.
To cause cancer, proto-oncogenes require 1 allele to be mutated and are therefore considered dominant.
What is cancer?Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss, and a change in bowel movements.While these symptoms may indicate cancer, they can also have other causes.Over 100 types of cancers affect humans.
Tobacco use is the cause of about 22% of cancer deaths. Another 10% are due to obesity, poor diet, lack of physical activity or excessive drinking of alcohol. Other factors include certain infections, exposure to ionizing radiation, and environmental pollutants.
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What is the atomic symbol for the element
in Group 5A (15) and the fifth period?
A) As
B) Sb
C) Sn
D) Te
E) Bi
The atomic symbol for the element in Group 5 A (15) and the fifth period in the periodic table is antimony or Sb.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
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how many grams of cu would have to react to produce 89.5 grams of ag
The number of grams of Cu present in the 89.5 grams of silver is 8.42 grams.
The balanced chemical equation is given as,
Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
According to the given equation: n(Cu) = n(AgNO₃)/2
Moles of AgNO₃ = Mass of AgNO₃/ Molar mass of AgNO₃
The molar mass of AgNO₃ is 169.87 g /mol
n(AgNO₃) = Moles of AgNO₃ = 45.0 g / 169.87 g /mol = 0.2649 mol
n(Cu) = n(AgNO₃)/2 = 0.2649 mol / 2 = 0.13245 mol
Number of Moles of Cu = Mass of Cu / Molar mass of Cu
The molar mass of Cu is 63.546 g /mol.
Hence,
Mass of Cu = Moles of Cu × Molar mass of Cu = 0.13245 mol × 63.546 g /mol = 8.41667 g = 8.42 g
Hence, the mass of Cu is 8.42 grams.
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When aqueous solutions of _________ are mixed, a precipitate forms. Answer a. NiBr2 and AgNO3 b. NaI and KBr c. K2SO4 and CrCl3 d. KOH and Ba(NO3)2 e. All of the above solutions will form a precipitate.
Precipitate develops when NiBr2 and AgNO3 are combined in aqueous solutions.
A precipitate forms when aqueous solutions are combined, right?When cations and anions in an aqueous solution react to generate a precipitate, an insoluble ionic solid, precipitation processes take place. The solubility principles for typical ionic solids can be used to determine whether or not such a reaction takes place.
What kinds of aqueous solutions precipitate?Sulfide (S2), hydroxide (OH), carbonate (CO32), and phosphate (PO43) are examples of anions-containing compounds that are frequently insoluble in water. If one of these anions is added to a solution containing a metal cation like Fe2+, Cu2+, or Al3+, a precipitate will result.
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Transition metal elements have atoms or ions with partially filled ________.
what is lithium atomic number
Chemical element lithium has the symbol Li and atomic number 3. Lithium is a solid at normal temperature and is categorised as an alkali metal.
Lithium SourcesIt is mixed and found in small units in almost all igneous rocks as well as numerous mineral springs; it does not naturally occur in nature. The more significant minerals that include it are amblygonite, petalite, spodumene, and lepidolite.
Currently, brines from Searles Lake in California and those in Nevada are being used to extract lithium. North Carolina is home to significant quadramene reserves. The fused chloride is used to electrolytically generate the metal. Similar to Na, K, and other members of the alkali metal class, lithium has a silvery look. Compared to sodium, it doesn't react with water as quickly. Lithium gives a flame a lovely crimson hue, but as the metal burns vigorously, the light turns brilliant white.
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what is the predicted freezing point depression of a solution with 0.200 g of myristic acid dissolved in 4.00 g of stearic acid? the kf of stearic acid is f 4.5 c/m. the molar mass of myristic acid is 228.37 g/mol.
0.94°C is the predicted freezing point depression of a solution with 0.200 g of myristic acid dissolved in 4.00 g of stearic acid.
What is freezing point?A liquid's freezing point is the temperature at which it turns into a solid. Similar to the melting point, the freezing point often rises with increasing pressure. In the case of combinations and for some organic substances.
The first solid that forms when a combination freezes often differs in composition from the liquid, and the development of the solid alters the composition of something like the remaining liquid, typically lowering the freezing point gradually.
ΔTf = i×Kf×m
m= given mole/ weight of solvent in kg
mole = given mass/ molar mass
= 0.200/ 228.37
= 0.00087
m=0.00087/ 0.004
= 0.21m
ΔTf = 1× 4.5×0.21
= 0.94°C
Therefore, 0.94°C is the predicted freezing point depression of a solution.
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Methyl isocyanate is used in the industrial synthesis of a type of pesticide and herbicide known as a carbamate. As a historical note, an industrial accident in Bhopal, India in 1984 resulted in leakage of an unknown quantity of this chemical into the air. An estimated 200,000 persons were exposed to its vapors and over 2000 of these people died.
Methyl isocyanate reacts with strong acids, such as sulfuric acid, to form a cation. For protonation on O , which resonance contributor is most important?
Protonation of isocyanate happens on Oxygen atom. Here the nitrogen atom attached to the carbocation is the resonance contributor
Methyl isocyanate is a precursor or intermediate in the production of carbamate, which is a popular pesticide and herbicide. Protonation happens in the carbenium ion, or carbocation, since it is sp hybridized with oxygen and nitrogen.( Image is given below)
There are two contributing resonance structures in the image. The protonation of nitrogen leads to a formation of resonance structure with triple bond on oxygen, which is very unlikely. The other structure contributes to the formation of protonated product, since triple bonded nitrogen atom is very likely to form.
So nitrogen is the resonance contributor for the protonation of oxygen.
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what is naoh a strong base?
NaOH is considered as a strong base because all the available OH ions in NaOH is present in solution as [tex]OH^{-}[/tex] and available to accept proton.
A base is said to be a strong base if that is completely dissociated in an aqueous solution. The strong base ionize in water to yield one or more hydroxide ion (OH-) per molecule of base. These bases react with strong acids to form stable compounds. The strong base is something like sodium hydroxide or potassium hydroxide which is fully ionic. The compound as being 100% split up into metal ions and hydroxide ions in solution is a strong base. Some strong bases like calcium hydroxide are not very soluble in water. A strong base completely dissociates and ionizes 100% in an aqueous solution. Strong bases are good proton acceptors which cannot remain in aqueous solution.
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The correct question is,
Is NaOH a strong base?
A chef finds a sealed container consisting of an ingredient that goes into his restaurant’s secret sauce. The ingredient’s molecules are moving in place. What will happen if the chef causes the ingredient to change phase by transferring energy into it?After the phase change, the ingredient’s molecules will move . . .answer choicesa. faster, and the ingredient will be a solid.b. faster, and the ingredient will be a liquid.c. slower, and the ingredient will be a solid.d. slower, and the ingredient will be a liquid.
If the chef applies energy to the sauce, it will changes to liquid state, as the particles from the gels state move faster apart and reduces their intermolecular attraction forming the liquid phase.
What is phase change ?The phase change of a material is a physical change in which the material changes from one state of matter to the other. For example boiling, melting or vaporizing are all phase changes.
In solid state the particles are closely packed by strong intermolecular forces. In liquids , particles have some more space to flow apart. In gaseous state the particles are far apart and free to diffuse anywhere.
When the gelly sauce is heated the particles are absorbing enough energy to weaken the intermolecular force of attraction. They gain kinetic energy to move faster and form a liquid state.
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Na2B4O7 forms NaB(OH)4 and B(OH)3 when dissolved in water. Balance the equation.
The given equation is the reaction between borax (Na2B4O7) and water (H2O) giving Sodium Tetrahydroxyborate (NaB(OH)4) and Sassolite (B(OH)3). The balanced equation is Na₂B₄O₇ + 7 H₂O → 2 NaB(OH)₄ + 2 B(OH)₃.
The given reaction is a double displacement reaction. In this type of reaction, two new products are formed by swapping two cations or anions. So to balance the given equation, follow the below steps.
1. Label each reactant and product using variables. We get,
a Na₂B₄O₇ + b H₂O → c NaB(OH)₄ + d B(OH)₃
2. Now create a system of equations for each element (Na, O, H, and B). We get,
Na: 2a = 1c + 0d
B: 4a = 1c + 1d
O: 7a + 1b = 4c + 3d
H: 2b = 4c + 3d
3. Now solve the variables a, b, c, and d. For this using the substitution/elimination method, we get, a=1, b=7, c=2, and d=2.
4. Finally, substitute these values in the equation, and we get,
1 Na₂B₄O₇ + 7 H₂O → 2 NaB(OH)₄ + 2 B(OH)₃.
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If we increase the temperature of the vessel to 450 K at constant volume, what would the pressure inside the vessel be?Group of answer choicesa. 10 atmb. 5 atmc. 20 atmd. 15 atm
This indicates that the pressure inside the vessel will increase correspondingly if the temperature of the vessel is raised from 300 K to 450 K while maintaining a constant volume. Therefore 15 atm is the correct response to the question.
The ideal gas equation, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is gas constant, and T is temperature in Kelvin, can be used to provide the solution.
The ideal gas law can be rearranged to solve for the pressure if the quantity of gas and the vessel's volume are both constant:
P = nRT/V
This indicates that the pressure inside the vessel will increase correspondingly if the temperature of the vessel is raised from 300 K to 450 K while maintaining a constant volume.
We can use the difference between the new temperature and the starting temperature to determine the new pressure:
When P1 and T1 are the beginning pressure and temperature, and P2 and T2 are the ultimate pressure and temperature, the equation P2/P1 = T2/T1 is used.
With the above numbers substituted, we obtain P2/P1 = 450 K/300 K = 1.5.
P2 = 1.5P1 is obtained by multiplying both sides by P1.
Since we are unsure of the starting pressure, we are unable to determine the precise value of the new pressure. The nearest solution can be found using the offered answer options, though.
Taking the initial pressure as a given is 10 atm, then the new pressure would be:
P2 = 1.5 x 10 atm = 15 atm
Therefore, the answer is (d) 15 atm.
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a certain substance has a heat of vaporization of 51.88 kj/mol. at what kelvin temperature will the vapor pressure be 4.50 times higher than it was at 323 k?
Answer:The vapour pressure will be 7.00 times higher at 358 K.
Explanation:Chemists often use the Clausius-Clapeyron equation to determine the vapour pressure at different temperatures:
does ionic dissolve in water
Yes, ionic bonds dissolves in water.
As we know water is a polar solvent and it has two poles one negative and another positive. The two poles of water usually have strong forces of attraction towards other charged ions, due to this water breaks the ionic bond by hydrogen bond formation. Hence, ionic bonds dissolve in water.
But, not all ionic compounds are able to be soluble in water. We usually use the solubility rules to predict whether an ionic compound dissolves in water or not.
On the other hand, generally covalent compounds are insoluble in water. This is due to water being a highly polar solvent don't dissolves covalent compounds in water due to presence of hydrogen bonding.
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