(1) Calculate the average speed of 1 mole of hydrogen molecules at 300 K. Neglect the mass of electron. (Mass of one proton =1.67×10^−27
kg ) A) 1781 B) 1455 C) 2057 D) 3291 E) 891 Q2: Ten particles are moving at the speed of 2,3,4,5,5,5,6,6,7 and 9 ms^−1
. Calculate the mo probable speed (ms^−1 ). A) 5.2 B) 30.6 C) 5.0 D) 5.5 E) 5.1

The total pressure at equilibrium when PCl5 is placed in a sealed container at an initial pressure of 0.0730 bar is given by the expression 0.0630 + √(0.0001 + 0.020P) where P is the initial pressure.

The given question asks us to find the total pressure at equilibrium when PCl5 is placed in a sealed container at an initial pressure of 0.0730 bar. The reaction that takes place is

PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)

Since the given reaction is an equilibrium reaction, the concept of Le Chatelier's principle should be used. The principle states that when a system at equilibrium is subjected to an external stress, the system responds by shifting in a direction that tends to counteract the stress to reestablish the equilibrium. The stress could be pressure, temperature or concentration.In this case, when the pressure of the reaction mixture is increased, the system tends to shift to the side that has less number of moles to counteract the pressure. Therefore, the pressure of the system will decrease after the shift. On the other hand, when the pressure is decreased, the system will shift to the side that has more number of moles to counteract the decrease in pressure. Therefore, the pressure of the system will increase after the shift.

Given that, initial pressure (P) = 0.0730 barAt equilibrium, the total pressure (Ptot) = P + xwhere x is the change in pressure due to the shift in equilibrium.We can calculate the value of x using the balanced chemical equation and the equilibrium constant (Kp)

Kp = (PCl3 × Cl2)/PCl5

The expression for Kp is derived from the law of mass action where the reactants and products are expressed in terms of their partial pressures at equilibrium.Substituting the given values, we get

0.020 = (PCl3 × Cl2)/PCl5

Multiplying both sides by PCl5 gives

0.020 × PCl5 = PCl3 × Cl2

We can express the values of PCl3 and Cl2 in terms of x by assuming that the change in pressure is small compared to the initial pressure. This is known as the equilibrium approximation.

PCl3 = xCl2 = x

The partial pressure of PCl5 is (P - x)

Therefore,0.020(P - x) = x²

Simplifying the expression gives

x² + 0.020x - 0.020P = 0

Using the quadratic formula, we can solve for x as

x = [-0.020 ± √(0.020² + 4×0.020P)]/2= [-0.020 ± √(0.0004 + 0.080P)]/2= (-0.010 ± √(0.0001 + 0.020P))

The negative value of x is not physically meaningful because it implies a negative pressure. Therefore,

x = -0.010 + √(0.0001 + 0.020P)

Substituting this value into the equation for Ptot,Ptot = P + x = 0.0730 - 0.010 + √(0.0001 + 0.020P)= 0.0630 + √(0.0001 + 0.020P)

The total pressure at equilibrium is given by the expression 0.0630 + √(0.0001 + 0.020P)

The total pressure at equilibrium when PCl5 is placed in a sealed container at an initial pressure of 0.0730 bar is given by the expression 0.0630 + √(0.0001 + 0.020P) where P is the initial pressure.

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The correct answer is: An ionic compound is a solid at room temperature, does not conduct electricity, and dissolves in water to give a solution that conducts electricity. This is because ionic compounds form a crystal lattice structure and dissociate into ions when dissolved in water, which allows the solution to conduct electricity.

Ionic compounds are composed of ions held together by electrostatic forces, typically formed through the transfer of electrons between atoms. They often have high melting and boiling points, are typically hard and brittle, and can conduct electricity when dissolved in water or in a molten state due to the presence of free-moving ions. This is because the ions are able to move and carry an electric charge. The ability of an ionic compound to dissolve in water and conduct electricity in solution is a characteristic property of ionic compounds.

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Answer:

its called either a physical change or chemical change

Explanation:

If Half- life of an isotope is 30 days and it was assumed that the person ate 100 Bq of isotope, there are 50 transformations in the stomach.

The radioactive decay of a sample of an isotope can be characterized by the half-life of that isotope. When a radioisotope undergoes decay, its nucleus becomes unstable, and it emits particles or energy to become more stable. The half-life of an isotope is the time it takes for half of the original sample to decay. The question states that the half-life of an isotope is 30 days, and the person ingested 100 Bq of isotope. It also says to calculate the number of transformations in the stomach using GI track model information .

Since the isotope has a half-life of 30 days, we can use the following formula to find the number of transformations in the stomach:` N = N₀ (1/2)^(t/T₁/₂)`where: N₀ = initial number of nuclei N = final number of nuclei (after time t)T₁/₂ = half-life of the isotope The isotope has a half-life of 30 days, so T₁/₂ = 30 days. The question doesn't specify how long the person has had the isotope in their stomach, so we'll assume it's been there for one half-life, or 30 days. Therefore, t = 30 days.

Substituting into the formula:` N = 100 (1/2)^(30/30)`Simplifying:` N = 100 (1/2)^1`Evaluating:`N = 50`So after 30 days in the stomach, the person would have 50 Bq of the isotope left. Therefore, the number of transformations in the stomach is the difference between the initial number of transformations (100 Bq) and the final number of transformations (50 Bq):`Number of transformations in stomach = 100 - 50 = 50 transformations. Therefore, there are 50 transformations in the stomach.

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t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.

Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.

The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.

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The percent ionization of hydrazoic acid (HN3) in a 0.100 M solution is 4.36%.

To calculate the percent ionization of hydrazoic acid (HN3) in a 0.100 M solution, we first need to determine the Ka value for the acid. According to Appendix D in most general chemistry textbooks, the Ka value for HN3 is 1.9 x 10^-5.

Next, we can set up the equilibrium equation for the ionization of HN3:

HN3 + H2O ⇌ H3O+ + N3-

We can assume that the initial concentration of HN3 is equal to 0.100 M, and since the acid is monoprotic, the initial concentration of H3O+ and N3- ions is 0. Therefore, at equilibrium, we can assume that x moles of HN3 have ionized to form x moles of H3O+ and N3- ions.

Using the Ka expression for HN3, we can write:

Ka = [H3O+][N3-] / [HN3]

1.9 x 10^-5 = x^2 / (0.100 - x)

Solving for x, we get x = 0.00436 M. This represents the concentration of H3O+ and N3- ions at equilibrium.

To calculate the percent ionization, we can use the formula:

% ionization = (moles of H3O+ formed / initial moles of HN3) x 100

Since we assumed that x moles of HN3 ionized to form x moles of H3O+ and N3- ions, we can say that moles of H3O+ formed = x. The initial moles of HN3 is equal to the initial concentration times the volume of the solution (assuming a volume of 1 L):

initial moles of HN3 = 0.100 M x 1 L = 0.100 moles

Therefore, % ionization = (0.00436 moles / 0.100 moles) x 100 = 4.36%.

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The net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid is B. Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq)

This is the net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid. The balanced equation for this reaction is NaF (aq) + HCl (aq) → NaCl (aq) +HF (aq).

The net ionic equation is derived by canceling out the spectator ions, which are ions that don't participate in the chemical reaction. In this case, Na+ and Cl- are spectator ions, which means that they don't participate in the reaction and are present in the same form on both sides of the equation. Therefore, they are cancelled out, leaving the net ionic equation Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq).

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Answer:

SeCl6

this is the correct formula.

The correct formula for selenium hexachloride is SeCl₆.

What is selenium hexachloride

Selenium hexachloride is a compound composed of one selenium atom (Se) and six chlorine atoms (Cl). The prefix "hexa-" indicates that there are six chlorine atoms bonded to the selenium atom.

The chemical formula SeCl₆ represents the composition of selenium hexachloride, indicating that there are six chlorine atoms bonded to one selenium atom.

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Answer:

Answer: true

Explanation:

It's pretty common for zoos to captive breed endangered animals to help keep the population stable, though the ethics of it are questionable considering most of the offspring will never be able to be released into the wild.

One of the products of this reaction is solid tin(II) carbonate (SnCO₃).

When aqueous sodium carbonate (Na₂CO₃) reacts with aqueous tin(II) nitrate (Sn(NO₃)₂), a double-replacement reaction takes place. The balanced chemical equation for the reaction is,

Na₂CO₃(aq) + Sn(NO₃)₂(aq) → SnCO₃(s) + 2NaNO₃(aq)

In this reaction, the sodium ion and nitrate ion from the sodium carbonate and tin(II) ion and nitrate ion from the tin(II) nitrate switch places to form solid tin(II) carbonate and aqueous sodium nitrate.

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NH4Cl, when dissolved in water, ionizes into NH4+ and Cl- ions. In a basic solution, the NH4+ ion can react with the OH- ion to produce NH3 gas and water, leading to a change in pH and potential hemolysis.

When NH4Cl is dissolved in water, it dissociates into NH4+ and Cl- ions due to the ionic nature of the compound. In a basic solution, there is an abundance of OH- ions. The NH4+ ion can react with the OH- ion through a process called neutralization or base-catalyzed hydrolysis.

The reaction can be represented as follows:

NH4+ + OH- → NH3 + H2O

In this reaction, the NH4+ ion accepts an OH- ion, forming NH3 (ammonia) gas and water. The release of ammonia gas can lead to an increase in pH and a change in the ionic balance within the solution.

Hemolysis refers to the rupture or destruction of red blood cells. Changes in pH and ionic balance can disrupt the osmotic balance of the cells, causing them to swell or shrink. In the case of NH4Cl, the reaction between NH4+ and OH- ions can alter the pH of the solution, potentially leading to hemolysis if red blood cells are exposed to it.

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Noble gases have completely filled electronic configuration. Therefore, noble gases or group 18 elements are inert in nature.

Noble gases are 18th group elements in periodic table. They are all having complete filled electronic configuration. The group members are helium, neon, argon, krypton, xenon and radon.

All these elements are existing in gaseous state and they are unreactive. Atoms become reactive when they have extra electrons or are deficient of electrons. Thus to achieve octet, they bond with other atoms.

In the case of noble gases, the valence shell is already achieved octet and no need of lose or gain of electrons. Thus, they are generally inert.

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Answer:

Cotton Shirts

Explanation:

I would think that the cotton shirts would be more appropriate form of of clothing for summer.

Cotton has tiny pores that enable the sweat to evaporate off your skin, and hence keep you cooler. At the same time it absorbs this sweat, allowing easy evaporation. Synthetic fibers hold heat in, and do not allow sweat to evaporate.

It would be that Rana should buy cottons shirts for summer.

Answer:

d

Explanation:

The empirical formula for the compound is Ca(OH)₂.

To determine the empirical formula of the compound, we need to find the simplest whole-number ratio of the elements present. We can do this by calculating the number of moles of each element and then finding the ratio between them.

Mass of calcium (Ca) = 13.5 grams

Mass of oxygen (O) = 10.8 grams

Mass of hydrogen (H) = 0.675 grams

First, we need to convert the masses of each element to moles using their respective atomic masses.

Atomic mass of Ca = 40.08 g/mol

Atomic mass of O = 16.00 g/mol

Atomic mass of H = 1.01 g/mol

Number of moles of Ca = 13.5 g / 40.08 g/mol = 0.3367 mol

Number of moles of O = 10.8 g / 16.00 g/mol = 0.675 mol

Number of moles of H = 0.675 g / 1.01 g/mol = 0.6693 mol

Next, we need to find the simplest whole-number ratio by dividing the number of moles of each element by the smallest number of moles obtained.

Dividing by 0.3367 (smallest value):

Number of moles of Ca = 0.3367 mol / 0.3367 mol = 1

Number of moles of O = 0.675 mol / 0.3367 mol = 2.005

Number of moles of H = 0.6693 mol / 0.3367 mol = 1.988

Rounding these values to the nearest whole number, we have:

Number of moles of Ca = 1

Number of moles of O = 2

Number of moles of H = 2

Thus, the empirical formula of the compound is Ca(OH)₂.

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There is no answer, science is about empirical knowledge, technology is the sum of techniques, skills, methods, and processes. I do not believe that you will find a answer for that.

Based on the fact that only herbicide was used to grow the corn, this means that the resistance type of the corn are caterpillars.

Herbicide are chemicals used to control and kill weeds that could hinder crop production while insecticides are chemicals used to control insect pests.

According to this question, a field of corn was grown with 250 L/ha herbicide and no insecticide. This means that only herbs or weeds are being controlled on the field.

Therefore, it can be said that the corn plants are the type that are resistant to caterpillars, which are examples of insects.

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Answer:

Br^-1

Explanation:

It is an ion that gained an extra electron making it 36 electrons but the other. one is in the neutral state with 35 electrons

Answer:

400 meters

Explanation:

Distance is the amount traveled. It doesn't matter if the runners start and end in the same place for distance, they still travel 400 meters.

Answer:

The answer may be A because that's what I believe

Answer:

See below

Explanation:

9 m * 2.16 kg/ m = ___________ kg    ( see how the 'm' cancels out?)

Answer:

1. Element - a substance that is made from only one type of atom

An element is made up of only one type of atoms and known for its unique properties than other elements.

2. Heterogeneous -  composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture

3.Homogenous - even distribution of parts throughout the whole mixture; not easily separated into individual components.

4. Product - the substance created as a result of a chemical reaction

Products are the final substance that created as a result of a chemical reaction.

5. Reactant - one of the starting substances (ingredients) that is involved in a chemical reaction

Reactants are the starting substance that takes part in a chemical reaction.

6. Solute - the substance that is being dissolved.

A Solute is a substance that is being dissolved in the solvent to make a solution.

7. Solvent - the substance that does the dissolving

A solvent is the medium in which the solute is being dissolved to make the solution.

A homogeneous mixture, like a solution, has an even distribution of its components throughout the whole mixture. It is not easily separated into individual components. On the other hand, a heterogeneous mixture, like a mixture of oil and water, has dissimilar parts that can be separated easily, and the components are unevenly distributed in the mixture.

1. Reactant: one of the starting substances (ingredients) that is involved in a chemical reaction.
2. Solvent: the substance that does the dissolving.
3. Solute: the substance that is dissolved.
4. Homogeneous: even distribution of parts throughout the whole mixture; not easily separated into individual components.
5. Heterogeneous: composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.
6. Element: a substance that is made from only one type of atom.
7. Product: the substance created as a result of a chemical reaction.

Let's match the terms to their definitions:

1. Element: A substance that is made from only one type of atom.
2. Reactant: One of the starting substances (ingredients) that is involved in a chemical reaction.
3. Product: The substance created as a result of a chemical reaction.
4. Solute: The substance that is dissolved.
5. Solvent: The substance that does the dissolving.
6. Homogeneous: Even distribution of parts throughout the whole mixture; not easily separated into individual components.
7. Heterogeneous: Composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.

For example, if we consider the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), hydrogen gas and oxygen gas would be the reactants. Water would be the product. In this reaction, hydrogen gas and oxygen gas are the starting substances that undergo a chemical reaction to form water.

In a solution, such as saltwater, the salt (solute) dissolves in the water (solvent). The salt is the substance that is dissolved, and the water is the substance that does the dissolving.

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Answer: 58.44amu

Explanation:

The Law of the Conservation of mass states that mass isn't created nor destroyed, but simply transformed.

Applying it in a chemistry context means that there will be the same amount of mass of product as you will start out with, as the mass is transformed from the reactants' mass to the products'.

Therefore, it is 58.44amu.

for earth quake write, a disturbance in a suburban city has cause a massive earth quake and many problems for the citizens living there, add what you want after that

hope this helps :D

Answer:

wow

Explanation:

dang

Answer:

I think if u will clear your topic it would be more helpful.

But if u r unable to do it, then u can just memorise it.

See, i will try to help u.

Salts are formed when acids react with bases.

and this reaction is called neutralisation reaction.

e.g. HCl+NaOH=NaCl+H2O.

It is very easy.

Other examples:

H2SO4+Mg(OH)2=MgSO4+2H2O.

There may be some other reactant with acid like u have mentioned above.

hope it helps u....

plz mark as brainliest...

Diselenium hexabromide has the chemical formula Si2Br6.

The nomenclature of covalent compounds utilizing prefixes served as the basis for the name of disilicon hexabromide (di- represents two atoms and hexa- represents 6 atoms). Ionic compounds, on the other hand, use the IUPAC nomenclature system based on the cation's valency.

A compound's bonding will be covalent if it is created from two non-metals. In most cases, ionic compounds are created when a metal reacts with a nonmetal (or a polyatomic ion). The reaction between two nonmetals produces covalent compounds.

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Answer:

1: At temperatures below 542.55 K

2: At temperatures above 660 K

Explanation:

Hello there!

In this case, according to the thermodynamic definition of the Gibbs free energy, it is possible to write the following expression:

\(\Delta G=\Delta H-T\Delta S\)

Whereas ΔG=0 for the spontaneous transition. In such a way, we proceed as follows:

1:

\(0=\Delta H-T\Delta S\\\\T=\frac{-102kJ/mol}{-0.188kJ/mol-K} \\\\T=542.55K\)

It means that at temperatures lower than 542.55 K the reaction will be spontaneous.

2:

\(0=\Delta H-T\Delta S\\\\T=\frac{132kJ/mol}{0.200kJ/mol-K} \\\\T=660K\)

It means that at temperatures higher than 660 K the reaction will be spontaneous.

Best regards!

Answer:

The mass number is defined as the total number of protons and neutrons in an atom. Consider Table below which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

Explanation: