Fill in the table to show your work." Write the entire given: you do not need to include the substance/formula. Round all numbers to thehundredths.Use the following units: "mol", "molecules", "atoms" and "g" for grams and "L" for liters.If you need to write an exponent use the "*" (ex: 6.02 x 10^23).What is the mass of 6.30 moles of Ca(OH)2?

The new volume of the gas sample when the temperature is changed to 6.9 x 10 K and the pressure decreased to 0.81 atm will be  37.82 L. Option 2.

The problem can be solved with the general gas law.

p1v1/t1 = p2v2/t2

Where t1 = initial temperature of the gas, p1 = initial pressure of the gas, v1 = initial volume of the gas, t2 = final temperature of the gas, p2 = final pressure of the gas, and v2 = final volume of the gas.

In this case:

v1 = 3.7 L, t1 = 250 k, p1 = 3.0 atm

v2 = ?, t2 = 6.9 x [tex]10^2[/tex] K, p2 = 0.81 atm

v2 = p1v1t2/t1p2

        = 3 x 3.7 x 6.9 x  [tex]10^2[/tex]/250 x 0.81

               = 7659/202.5

                 = 37.82  L

Thus, the new volume of the gas sample when the temperature and the pressure changed would be 37.82 L.

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Answer

pOH = 4.1

Explanation

Given:

pH = 9.9

Required: The concentration of OH-

Solution

pH + pOH = 14

9.9 + pOH = 14

pOH = 14-9.9

pOH = 4.1

The most important thing to remember about tritium sights is that they gradually lose their effectiveness over time. Tritium has a half-life of about 12.5 years, so tritium sights will only be half as bright in a little more than a decade.

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Elements do emit photons on those colors when electrons decay to a ground level orbit then the each element will produce its own set of color

Photon is the tiny particle of electromagnetic radiation

Light travels as discrete packets of light called photons and each photon will be carrying a certain amount of energy then the energy carried within a photon determines then what color it is with blue photons having about twice the energy as red photon and the fact are given below

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18. Nickel is a chemical element with the symbol Ni, and with an atomic number of 28, its chemical series will be classified as metal, and also a Transition metal, from period 4 and group 10. Therefore letter A

19. Subatomic particles will have a few differences among them, one of these differences is mass, because protons and neutrons have a very similar mass, but both masses are way heavier than electrons, therefore letter B is correct

The equilibrium pressure of NO in the reaction is 2.88 atm .

Equilibrium constant is defined as a number that expresses the proportion of products and reactants present at equilibrium.

The equilibrium constant can also be defined as a numerical value that indicates how much reactant is converted into product.

Given Kp = 1.11 x 10⁻⁵

T = 200 °C

V = 2.5 L

P = 2.50 atm

Considering the equation;

[tex]\rm 2 NO_2(g) \rightarrow 2 NO(g) + O_2(g)[/tex]

2 NO₂ = 2.5-2x

2 NO = 2x

O₂ = x

Kp = [P(NO)]² x P(O₂) / P(NO₂)

1.11 x 10⁻⁵ = (2x)² x (x) / (2.5 - 2x)²

1.11 x 10⁻⁵ = 4x³ / (0.5)²

1.11 x 10⁻⁵ = 4x³ / 0.25

4x³ = 0.2775

x³ = 0.0694

x = 1.44

Pressure of NO = 2 x 1.44

                          = 2.88 atm

Thus, the equilibrium pressure of NO in the reaction is 2.88 atm .

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Equilibrium constant is the only concept that is to be used here to calculate partial pressure of NO. The partial pressure of Nitrogen comes out to be  0.0083atm.

Equilibrium constant is a rate constant at equilibrium shows the values of reaction with respect to the pressure and concentration

[tex]K_{p} =\frac{[partial pressure of NO]^{2} [partial pressure of O_{2}] }{[partial pressure of NO_{2} ]^{2} }[/tex]

substituting the given values in the questions

1.11 × 10⁻⁵×(2.50atm)²=      [partial pressure of NO}²

6.93×10⁻⁵atm²=  [partial pressure of NO}²

0.0083atm  =partial pressure of NO

Thus the pressure of NO in is 0.0083atm

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When we use an equation for stoichiometry, it has to be balanced.

The given equation:

Is already balanced, because there are 2 N on both the left and right sides and 6 H on both the left and the right sides.

So, we can skip the balancing.

Now, we can use the coefficients on the involved compounds to calculate the quantity we want.

We have:

Number of moles of H₂: ?

Coefficient of H₂: 3

Number of moles of NH₃: 5 mol

Coefficient of NH₃: 2

So, we can apply the rule of three:

H₂ ---- NH₃

x ---- 5 mol

3 ---- 2

So, we can write the relation:

So, we need 7.5 mol of hydrogen gas.

The equilibrium expressions are written for the reactions as;

a) K =[HF]^2/[H₂] [F₂]

b) [MnCl₂] [Cl₂] [H₂O]/[MnO₂] [HCI]^4

Let us note that many times it is important to see the extent to which the reactant are converted into products. The value that shows us how much the reactants are converted into products is what we call the equilibrium expression.

Given this, the equilibrium has to do with the ratio of the products to that of the reactants. In this case, we can see that the equilibrium position can be written as the ratio of the amounts of the reactants to the products raised to the power of the stoichiometric coefficients of the species involved.

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Answer: Another Cl should be shown around Mg that will transfer its unpaired electron to Mg.

Explanation:

1.94 moles of 35 grams of ice (H₂O).

18 g of ice = 1mol.

Therefore,

35 grams of ice  = 35/18

35 grams of ice  = 1.94 moles.

Molar mass (M) is a physical property defined as the mass of a certain element or molecule per mole of  substance. Since a mole is defined as the amount of a substance and substances have different masses, each element or molecule has a different molar mass. For example, if one has a dozen bricks and the other has a dozen feathers, they have the same amount of matter but very different total masses.

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Answer:

The number of grams of chlorine gas used was 681.6 g

Explanation:

Given that 9.6 moles of chlorine gas was used, we want to know the mass used

Mathematically, the mass of chlorine gas used is the product of the number of moles of chlorine gas used and the molar mass of chlorine gas

The molar mass of chlorine gas is 71 g/mol

Thus, the number of grams used will be :

71 g/mol * 9.6 mol = 681.6 g

Answer:

Exothermic reaction.

Explanation:

Since the products end up having a lower energy than the reactants, that means that the reaction is exothermic. It also means that this reaction released energy.

²³⁵UF₆ effuse 1.0042 times faster than ²³⁸UF₆.

The expression for rate of effusion of two gases can be define as follows :

Effusion Rate A / Effusion Rate B = [tex]\sqrt{Mb / Ma}[/tex]

now we have to calculate the molar masses of the given :

molar mass of ²³⁵UF₆ = 235 + 6(19) = 349 g/mol

molar mass of  ²³⁸UF₆ = 238 + 6(19) = 352 g /mol

now substituting the values in the formula : we get,

Rate ²³⁵UF₆ / Rate ²³⁸UF₆ = [tex]\sqrt{352 / 349}[/tex] = 1.0042

Therefore , the Rate ²³⁵UF₆ effuses 1.0042 times faster than ²³⁸UF₆.

Thus, ²³⁵UF₆ effuse 1.0042 times faster than ²³⁸UF₆.

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Answer: it is 800

Explanation:

Answer:

The Sun is a star.

Explanation:

Answer:

sound and sunlight are not considered matter but, the rest is matter

Explanation:

Between water with a pH of 4 and one with a pH of 7.4, I will rather go swimming in the one with a pH of 7.4.

The pH of a substance is the degree of acidity of alkalinity of the substance.

The pH scale ranges from 0 to 14. A pH of 7 is considered neutral.

Any pH below 7 is acidic. The further the pH is the downside of 7, the more acidic the substance.

Any pH above 7 is considered basic. The further the pH is the upside of 7, the more basic or alkaline the substance is.

Substances with very high or very low pH are usually corrosive and will harm the human body. The human body's pH ranges between 7.35 to 7.45.

Thus, swimming in water with a pH of 4 would be totally harmful to the body. Swimming in water with a pH of 7.4 would be safe.

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DNA has a double helix structure, which is basically two chains of nucleotides that are bonded by hydrogen bonds.

It means that the correct answer is double helix.

Considering the definition of empirical formula, the empirical formula for the compound is Fe₃PO₄.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms.

In this case, in first place you need to convert the number of grams given into percentage as follow:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 63.81 grams of iron, 11.81 grams of phosphorus and 24.38 grams of oxygen.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Iron (Fe): 1.14 moles÷ 0.38 moles= 3

Phosphorus (P): 0.38 moles÷ 0.38 moles= 1

Oxygen (O): 1.52 moles÷ 0.38 moles= 4

Therefore the Fe: P: O mole ratio is 3: 1: 4

Finally, the empirical formula is Fe₃P₁O₄= Fe₃PO₄.

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The biogeochemical cycles of the carbon, nitrogen, and phosphorus cycle interact with each other by ensuring constant exchange between living organisms and their non-living environment.

The reservoir of the carbon cycle is the ocean, the reservoir of the nitrogen cycle is the atmosphere, and the reservoir of the phosphorus cycle is rocks.

Some negative impacts of human activities on each cycle include:

The Carbon Cycle is the most important cycle that recycles carbon between the living and non-living components of the earth.

The Carbon Cycle is one of the biogeochemical cycles.

The elements and compounds that make up nutrients move continually through the air, water, soil, rock, and living organism in ecosystems and in the biosphere in cycles called biogeochemical cycles.

The concentration of carbon in living matter (18%) is greater than in the earth (0.19%)

For life to continue, carbon must be recycled

Carbon in the abiotic environment includes:

Processes that release CO₂ into the atmosphere include:

Processes that remove CO₂ from the atmosphere include:

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To solve this we must know the concept behind the phenomenon of elevation in boiling point when a non volatile solute is added to any solvent, the molar mass of solute is 115.40g

Whenever a non volatile solute is added to a solvent then the boiling point of solvent increases

Mass of solution = volume× density

                             = 25.0 mL×0.997 g/mL

                             =24.925g

                            = 0.024Kg

ΔT= Kb× molality

100.300-100=0.512×m

0.58=m

0.58×0.024=mole

0.013=mole

mass =given mass÷ mole

        = 1.50÷0.013

         = 115.40g

Thus the molar mass of solute is 115.40g

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Let me explain this question using the following picture:

As you can notice, a polyester is formed when an acid and alcohol react together.

Therefore, the answer is acid and alcohol.

Answer

The surface area of the reactants.

Explanation

The reactants of reaction III exists in both solid and liquid states, when solids and liquids react, increasing the surface area of the solid will increase the reaction rate. A decrease in particle size causes an increase in the solid’s total surface area.

Therefore, the only factor that would affect only the third reaction is:

The surface area of the reactants.

The last option is the correct answer.

In this question we are given the mols of HCl as 0.171 mols and the volume of the solution id 0.300L

we are required to find the molarrity of the solution.

molarity can by found by the equation

M = n/V

were M is Molarity and n is number of molds and V is the volume of the solution.

so the answer is

M =0.171/0.300

= 0.570 M

Positive cations in a sea of delocalized electrons are found in Metals.

So, the correct option is D.

Electricity flows take place as the structure of solid metals contains delocalized electrons as well. The aligned positive ions (cations) in the metallic structure are surrounded by a "sea" of delocalized electrons. This creates characteristics like conductivity by allowing the electrons to travel freely throughout the structure. The orbital that encompasses multiple nearby atoms contains delocalized electrons. In aromatic and mesoionic systems as well as conjugated double-bond systems, delocalized electrons can be discovered.

According to the "electron sea" hypothesis, metal atoms in solids shed their outermost electrons to arrange themselves into a regular lattice of positive metallic ions. The outside electrons do not "belong" to any one atom; instead, they create a sea or pool of delocalized electrons that are free to roam about the constant lattice of positive ions at random.

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Answer:

Explanation:

Here, we want to get a tentative law from the given measurements

To get the correct options, we have to look at the values

Let us take a look at the options one after the other

a) Mass of gas is inversely proportional to the volume

What this mean is that as the mass of gas increase, the volume should decrease. Or as the mass decrease,the volume increase

Now, let us take a look at the values:

As mass increases from top to bottom, the volume also increases

This mean the law cannot be correct. This option is incorrect

b) Mass to volume ratio of a gas is constant

To check for this, we have to divide the mass by the volume for all the pairs

We can check for this as follows:

i) 22.5/1.6 = 14.0625

ii) 35.8/2.55 = 14.039

iii) 70.2/5 = 14.04

iv) 98.5/7.01 = 14.05

Looking at all the values, we can see that if we rounded them to the same whole number, we have 14 all through. That means the law is correct

This option is correct and should be selected

c) The mass of a gas is directly proportional to its volume

This is the direct opposite of the first option

We can see that as the mass increases,the volume also increases.That makes this option a correct one.

The option is correct and should be selected

d) The mass-to-volume ratio of a gas isn't constant

This is the opposite to the second option. We have proved and seen that the mass to volume ratio is constant.

This option is not correct and should not be selected

The first step to solve this question is to write and balance the chemical equation that describes the reaction:

According to the given information the limiting reactant is NaCl, this is because 9 moles of this reactant react with 3 moles of Al(NO₃)₃.

Use this information to find the maximum amount of NaNO₃ that was produced:

It means that 9 moles of NaNO₃ are produced.

-270.16kJ

The formula for calculating the mole of a compound is expressed as:

Determine the mole of 43g of CH3OH

If the heat of formation of 1 mol of CH3OH is -201.3KJ, the amount of heat formed by 1.342moles of the same compound is given as:

Therefore -270.16kJ heat is exchanged when 43g are formed'

There are two surrounding atoms and no lone pair of electrons in the nitrogen-centered nitrous oxide molecule. The valence shell of the nitrogen atom has 5 electrons, while the molecule has 2 nitrogen atoms. Thus, nitrogen atoms contribute 10 electrons.

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Answer:

All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms. For example, all helium atoms have two protons, and no other elements have atoms with two protons

Explanation:

plus dude good luck can't believe people still do school work at this time.