When NaCl dissolves in water, aqueous Na and Cl- ions result. The force of attraction that exists between Na and H2O is called a(n) ________ interaction.

Answer:

130.68 × 10²³ atoms

Explanation:

Given data:

Number of moles of Rn = 21.7 mol

Number of atoms = ?

Solution:

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

21.7 mol × 6.022 × 10²³ atoms / 1mol

130.68 × 10²³ atoms

Answer:

(1) the surface area of the solute,

(2) the temperature of the solvent,

(3) the amount of agitation that occurs when the solute and the solvent are mixed.

Explanation:

Answer:

D. 45.0 g

Explanation:

In present reaction, 1 mol of N2 react with 3 moles of H2 to generate 2 moles of NH3

Thus, 2 moles of NH3 ≡ 3 moles  of H2

Therefore, 15 moles of NH3 ≡ (3×15)/2 = 22.5 moles of H2.

We know that, 1 mole of H2 ≡ 2 g

Therefore, 22.5 moles of H2 ≡ 2 × 22.5 = 45 g

Thus, 45 g of hydrogen are needed to produce 15.0 mol of ammonia, if the reaction goes to completion

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Answer:

the answer is salmonella

It can be challenging for solar energy to return to space once it has reached Earth. Some of this energy is diverted into the atmosphere by the greenhouse effect, where it is then absorbed and released by greenhouse gases.

Heat is reflected back into the atmosphere from solar energy that has been absorbed at the Earth's surface. Greenhouse gases absorb a large portion of the heat as it travels through the atmosphere and is radiated back into space. What makes greenhouse gases heat-sinks? Unlike other gas molecules in the atmosphere, greenhouse gases have a more complicated structure that can absorb heat. They either return the heat to space, another greenhouse gas molecule, or the surface of the Earth.

The temperature of the Earth would be below zero without the greenhouse effect. It is a natural process in part. However, when we increase the atmospheric concentration of greenhouse gases, the greenhouse effect on Earth becomes stronger. As a result, our planet's climate is warming.

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The thermal efficiency of a hydrogen fuel cell can be calculated using the following formula:

Efficiency = (Power output / Heat input) x 100%

where Power output = Voltage x Current and Heat input is the heat released during the combustion of hydrogen fuel.

Assuming the hydrogen fuel is fully combusted and the heat generated is used to produce electricity with 100% efficiency, then the heat input is proportional to the amount of hydrogen fuel consumed.

Let's assume that the fuel cell consumes 1 mole of hydrogen gas at standard conditions (1 atm, 298 K) to produce the given amount of electrical energy. The heat of combustion of hydrogen gas is -286 kJ/mol.

The amount of electrical energy produced can be calculated as:

Power output = Voltage x Current

Power output = 0.58 V x 35 A

Power output = 20.3 W

The amount of heat generated during the combustion of 1 mole of hydrogen gas is:

Heat input = -286 kJ/mol

Therefore, the thermal efficiency of the hydrogen fuel cell is:

Efficiency = (Power output / Heat input) x 100%

Efficiency = (20.3 W / (-286 kJ/mol)) x 100%

Efficiency = -0.0071 x 100%

Efficiency = -0.71%

The negative sign indicates that the fuel cell is not operating efficiently, which is not physically possible. It is likely that there is an error in the calculation or the assumptions made.

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Answer:

5.31×10¯²³ g.

Explanation:

Data obtained from the question include:

Molar weight of O2 = 32 g/mol

Mass of 1 oxygen atom =..?

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.

This implies that 1 mole of O2 also contains 6.02×10²³ atoms.

1 mole of O2 = 32 g

The mass of 1 atom of O2 can be obtained as follow:

32 g of O2 contains 6.02×10²³ atoms.

Therefore Xg of O2 will contain 1 atom i.e

Xg of O2 = 32/6.02×10²³

Xg of O2 = 5.31×10¯²³ g

Therefore, the mass of a single oxygen atom is 5.31×10¯²³ g.

The mass of a single oxygen atom is 5.31 x 10⁻²³ grams. Therefore, option D is correct.

The molecular weight of oxygen gas is 32 g/mol. To find the mass of a single oxygen atom, divide the molecular weight by Avogadro's number (6.022 x 10²³ atoms/mol).

Avogadro's number (6.022 x 10²³) represents the number of particles (atoms, molecules, or ions) in one mole of a substance.

To find the mass of a single oxygen atom, divide the molecular weight of oxygen gas by Avogadro's number:

Mass of a single oxygen atom = (32 g/mol) / (6.022 x 10²³ atoms/mol)

Simplifying the expression:

Mass of a single oxygen atom = 5.31 x 10⁻²³ g

Therefore, the mass of a single oxygen atom is 5.31 x 10⁻²³ grams.

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Answer:

c. add coefficients as needed

Explanation:

A chemical equation is defined as the equation that shows changes in a chemical reaction. A chemical equation consist of reactant and product, reactant is at left side of the arrow and product is at right side of the arrow.

Reactant => Product

While balancing a chemical equation, the basic rule is to balance the coefficient as required. Coefficient represents the number of molecules and is used at front of a chemical symbol. Change in coefficient helps balance the number of atoms or molecules of the substances on both the sides of the arrow.

Subscripts are never allowed to change because it can change the chemical involved in the reaction.

Hence, the correct answer is "c. add coefficients as needed".

An imbalance in the lonization energy leads to the distribution of charge in molecules. A polar molecule is one that has an unequal distribution of charges, causing it to have a positive end and a negative end.

In the case of an uneven distribution of charges, which molecules are present?

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The percent abundance of post-1982 pennies in the sample is 60% as per the given data.

Data sampling is a statistical analysis technique that uses a representative subset of data points to identify patterns and trends in the larger data set under consideration.

To find the percent abundance of post-1982 pennies in the sample data, we need to determine the total number of pennies and the number of post-1982 pennies.

The total number of pennies is:

8 + 12 = 20

To find the number of post-1982 pennies, we need to know the total mass of the pennies. We can use the average mass of the pre-1982 and post-1982 pennies to estimate the number of post-1982 pennies.

The total mass of the pre-1982 pennies is:

8 x 3.1 g = 24.8 g

The total mass of the post-1982 pennies is:

12 x 2.5 g = 30 g

The total mass of all the pennies is:

24.8 g + 30 g = 54.8 g

We can estimate the number of post-1982 pennies by dividing the total mass of the post-1982 pennies by the average mass of a post-1982 penny:

30 g / 2.5 g = 12

So there are 12 post-1982 pennies in the sample.

To find the percent abundance of post-1982 pennies, we can use the following formula:

Percent abundance = (number of post-1982 pennies / total number of pennies) x 100%

Percent abundance = (12 / 20) x 100% = 60%

Therefore, the percent abundance of post-1982 pennies in the sample is 60%.

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Answer:

Its electrical charge is -2.

Combustion analysis of 1.200 g of an unknown compound that is containing carbon, the hydrogen and oxygen produced 2.086 g of carbon dioxide and 1.134 g of water. The empirical formula of the compound is C₃H₈O₂.

The mass of the carbon dioxide = 2.086 g

The mass of the water = 1.134 g

The moles of the carbon dioxide = 2.086 / 44

                                                       = 0.0474 mol

The moles of the water = 1.134 / 18

                                       = 0.0629 mol

The moles of the carbon = 0.0474

The mass of carbon = 0.0474 × 12

                                  = 0.5688 g

The moles of hydrogen =  0.062948 ×  2

                                        = 0.1258 mol

The mass of hydrogen = 1 × 0.1258

                                      = 0.1258

The mass of  oxygen = 0.5037 g

The moles of oxygen = 0.031489

By dividing the smallest one , we get :

Moles of carbon = 3

Moles of hydrogen = 8

Moles of oxygen = 2

Thus, the empirical formula is C₃H₈O₂.

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The pKa of the weak acid, based on the titration results, is 4.24.

Only the half-equivalence pH is needed to answer this.

At the half-equivalence point of the titration, half of the monoprotic acid HA has been neutralized and converted to the appropriate salt. That means that the concentration of the acid [HA] is equal to the concentration of its anion [A⁻]. Now, we can consult the Henderson-Hasselbalch equation:

\(pH = pKa + log\frac{[A^{-} ]}{[HA]}\)

Because [A⁻] = [HA], that means that:

[A⁻]/[HA] = 1

log(1) = 0

pH = pKa

So, at the half-equivalence point in the titration of the weak acid the pH value of the solution is equal to the pKa value of the weak acid, so pKa = 4.24

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From the concept of molarity, the volume of the stock HBr needed to prepare 850.0 mL of HBr solution with a pH of 1.30 from an 8.0 M stock solution (HBr) is approximately 0.05041 L.

A solution (concentrated) which is diluted to some lower concentration for actual use is a stock solution. By the molarity formula,
C1V1 = C2V2, where:
C1 = initial concentration of the stock solution
V1 = initial volume of the stock solution
C2 = final concentration of the desired solution
V2 = final volume of the desired solution
In this case:
C1 = 8.0 M (concentration of the stock HBr solution)
V1 = ?
C2 = 10^(-pH) (final concentration of the desired solution, where pH = 1.30)
V2 = 850.0 mL (final volume of the desired solution)
On substituting the known values into the formula and solve for V1:
(8.0 M) (V1) = (10^ (-1.30)) (850.0 mL)
             V1 = (10^ (-1.30)) (850.0 mL) / (8.0 M)
                  = 0.05041 L
Therefore, the volume of the stock HBr needed to prepare 850.0 mL of HBr solution with a pH of 1.30 from an 8.0 M stock HBr solution is approximately 0.05041 L.

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Answer:

9 x 10^3 + 2.3 x 10^4

Scientific notation

3.2·10^4

Expanded form

32000

the pH of a 0.000125 M HBr solution is 3.90. The pH of a diluted 175 mL 0.000125 M HBr solution in a total volume of 3.00 L is 2.22. Calculate the pH of a 0.000125 M HBr solution. The dissociation of HBr can be written as follows: HBr ⇌ H+ + Br-

The pH of a 0.000125 M HBr solution is 3.90. The pH of a diluted 175 mL 0.000125 M HBr solution in a total volume of 3.00 L is 2.22.

Solution:

Calculate the pH of a 0.000125 M HBr solution

The dissociation of HBr can be written as follows: HBr ⇌ H+ + Br-

According to the law of mass action, the equilibrium expression for the dissociation of HBr can be written as follows:

[H+][Br-] / [HBr] = k [H+][Br-] = k[HBr]

Here, k is the dissociation constant of HBr, which is 8.7 × 10^-10.

[H+][Br-] = (8.7 × 10^-10)[HBr]

M = [H+]; M = [Br-]

M = 0.000125 M, so [H+] = [Br-] = 0.000125 M

[H+] = 0.000125 M

The pH of a solution is defined as follows:

pH = -log[H+]

pH = -log[0.000125]

pH = 3.90

What is the pH of the diluted solution if 175 mL of this solution is diluted to a total volume of 3.00 L?

To solve this problem, we'll use the following formula: M1V1 = M2V2

M1 = 0.000125 M

M2 = ?

V1 = 175 mL

V2 = 3000 mL = 3.00 L

Before we begin, we'll convert the volume to liters.

175 mL ÷ 1000 = 0.175 L

Now, we can solve for M2: M1V1 = M2V2

(0.000125 M)(0.175 L) = M2(3.00 L)

M2 = 0.00000729 M

The pH of this solution can now be calculated: pH = -log[M2]

pH = -log[0.00000729]

pH = 2.22

Answer: So, the pH of a 0.000125 M HBr solution is 3.90. The pH of a diluted 175 mL 0.000125 M HBr solution in a total volume of 3.00 L is 2.22.

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To answer this question we have to usethe ideal gas law:

Where P is the pressure, V is the volume, n is the number of moles, R is the constant of ideal gases (0.082atmL/molK) and T is the temperature (in Kelvin degrees).

The first step is to convert the given mass of N2 to moles using its molecular mass:

And convert the pressure from mmHg to atm (1atm=760mmHg):

Finally, solve the initial equation for T and replace for the given values:

The temperature of the gas is 539.15K.

Convert this temperature to Celsius by substracting 273.15 to the temperature in Kelvins:

The temperature of the gas is 226°C.

The correct order from shortest to longest bond length is D) C2, B2, H2, N2. The correct option is D.

The bond length of a molecule depends on factors such as the size of the atoms involved, the strength of the bond, and the presence of any multiple bonds. In this case, the molecules being compared are H2, N2, C2, and B2.

The bond lengths of these molecules can be estimated based on their position in the periodic table and their bonding patterns.

The bond length generally decreases across a row in the periodic table due to increasing effective nuclear charge and increases down a column due to the larger size of the atoms.

Among the molecules given, B2 has the shortest bond length because boron is the smallest atom and the bond is a triple bond.

Next would be C2 due to its small size and triple bond, followed by N2, which has a triple bond as well. Finally, H2 has the longest bond length due to its larger size and a single bond.

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Chefs sauté garlic and onions in butter before using them in recipes primarily because their flavors and/or odors are fat-soluble. This process helps to enhance the taste and aroma of the dish.

Garlic and onions contain volatile compounds that contribute to their distinct flavours and aromas. These compounds are soluble in fats and oils rather than in water. By sautéing them in butter, which is a fat, these compounds are released and dissolved, allowing their flavours to infuse into the dish. The fat-soluble nature of these compounds enables them to disperse more evenly and intensify the overall taste profile of the recipe. Additionally, sautéing garlic and onions in butter also helps to soften their texture and mellow their flavours. The gentle cooking process allows the natural sugars in onions to caramelize, resulting in a sweeter taste. It also helps to reduce the pungency and sharpness of garlic, making it more palatable.

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Answer:

M2 = 0.95M

Explanation:

M1V1 = M2V2

(1.9)(0.5) = M2(1)

M2 = 0.95M

Heres a list of questions

1. Define atom.

Atom is the smallest particle of a substance.

2. What are the subatomic particles found in an atom?

The subatomic particles found in an atom are electrons, protons, and neutrons.

3. Define charged particle.

Charged particle is a particle that has an electric charge.

4. Define electric charge.

Electric charge is the physical property of particles such as electrons and protons. Electric charge causes other particles to experience a force.

5. What are the charged particles found in an atom?

Electrons and protons are the charged particles found in an atom.

6. What are the different types of charged particles?

Charged particles are of two types: positive charges and negative charges.

7. What are the negatively charged particles in an atom?

Electrons are the negatively charged particles in an atom.

8. What are the positively charged particles in an atom?

Protons are the positively charged particles in an atom.

9. What is the mass of an electron?

The mass of an electron is 9.107 × 10-31 kilograms.

10. What is the mass of a proton?

The mass of a proton is 1.672 × 10-27kilograms.

11. Define atomic number.

The total number of protons in the nucleus of an atom is called atomic number.

12. Define neutron number.

The total number of neutrons in the nucleus of an atom is called neutron number.

13. Define mass number.

Mass number is the total number of protons and neutrons in the nucleus of an atom.

Mass number can be mathematically written as

Explanation:

Answer:

ima just take all your points and roll out tbh peace

Explanation:

992 millimoles of zinc nitrate the chemist has added to the reaction flask.

Zinc nitrate is an inorganic compound with the formula Zn(NO₃)₂. This colorless, crystalline salt is extremely hydrophilic. it's generally encountered as a hexahydrate Zn(NO₃)₂·6H₂O. it's soluble in each water and alcohol. Zn Nitrate may be a colorless or white, odorless, crystalline (sand- like) solid or flake. it's used as a catalyst and a mordant for dyes, and in liquid plant food.

Chemists and materials scientists study substances at the atomic and molecular levels and analyze the ways that within which the substances move with each other. They use their information to develop new and improved product and to check the standard of factory-made product.

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A chemist adds 435.0mL of a 2.28 M zinc nitrate ZnNO32 solution to a reaction flask. Calculate the millimoles of zinc nitrate the chemist has added to the flask. Round your answer to 3 significant digits.

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There are approximately 12.7 grams of phosphorus in a 50-gram sample of aluminum phosphate.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to know the molar mass and the chemical formula of aluminum phosphate.

The chemical formula for aluminum phosphate is AlPO4. It indicates that each molecule of aluminum phosphate contains one aluminum atom (Al), one phosphorus atom (P), and four oxygen atoms (O).

To calculate the molar mass of aluminum phosphate, we can add up the atomic masses of its constituent elements based on their stoichiometric ratios:

Molar mass of AlPO4 = (molar mass of Al) + (molar mass of P) + (4 * molar mass of O)

Using the periodic table, we can find the atomic masses of the elements:

Molar mass of Al = 26.98 g/mol

Molar mass of P = 30.97 g/mol

Molar mass of O = 16.00 g/mol

Now, let's calculate the molar mass of aluminum phosphate:

Molar mass of AlPO4 = (26.98 g/mol) + (30.97 g/mol) + (4 * 16.00 g/mol)

= 121.95 g/mol

The molar mass of aluminum phosphate is 121.95 g/mol.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to calculate the mass fraction of phosphorus in the compound. The mass fraction is the ratio of the molar mass of phosphorus to the molar mass of aluminum phosphate.

Mass fraction of phosphorus = (molar mass of P) / (molar mass of AlPO4)

= (30.97 g/mol) / (121.95 g/mol)

≈ 0.254

Multiplying the mass fraction by the mass of the sample gives us the grams of phosphorus:

Grams of phosphorus = (mass fraction of phosphorus) * (mass of the sample)

= 0.254 * 50 g

≈ 12.7 g

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This process rapidly cools down the reaction and stops it from progressing any further.

In a chemical reaction, stirring is often done to promote uniform mixing of reactants and to increase the rate of the reaction. Stirring helps distribute heat evenly, ensures contact between reactants, and assists in the removal of byproducts.

Quenching is a process used to rapidly cool down a reaction or stop it completely. It is often done by adding a quenching agent, such as a saturated aqueous solution, to the reaction mixture. The quenching agent absorbs excess heat and reacts with any reactive intermediates or products, effectively stopping the reaction.

A saturated aqueous solution is a solution that contains the maximum amount of solute that can be dissolved at a given temperature. This means that no more solute can dissolve in the solution, resulting in a state of equilibrium between the dissolved solute and the undissolved solute.

By adding a saturated aqueous solution to the reaction mixture, the excess heat is rapidly absorbed, and the reaction is quenched. This prevents any further reaction from occurring and allows for the isolation of the reaction products.

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Answer:

ocean heats up and cools down relatively slowly. Therefore, areas near the ocean generally stay cooler

Answer:

The physical state of chemicals is also very commonly stated in parentheses after the chemical symbol, especially for ionic reactions. When stating physical state, (s) denotes a solid, (l) denotes a liquid, (g) denotes a gas and (aq) denotes an aqueous solution.

Explanation:

Hope you like my answer

Answer:

1. false

2. true

3.true

4.true

Explanation:

Answer:

1. True

2. True

3. True

4. True

5. True

HOPE THIS HELPS

The molarity of the sodium chloride solution is 0.228 M.

To determine the molarity of a solution, you need to know the number of moles of solute (in this case, sodium chloride) and the volume of the solution in liters.

The molecular weight of sodium chloride (NaCl) is 58.44 g/mol (22.99 g/mol for Na and 35.45 g/mol for Cl)

The mass of NaCl in grams is given as 3.33 g

Number of moles = mass ÷ molecular weight = 3.33 g ÷ 58.44 g/mol = 0.057 moles

converting the volume from milliliters to liters:

250 mL = 0.25 L

Now we can calculate the molarity:

Molarity (M) = moles of solute ÷ liters of solution

M = 0.057 moles ÷ 0.25 L = 0.228 M

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