Q: Which of the following is a correct application of the mole concept?

One mole of $$CO_2$$ contains $$6.022 \times 10$$^{23}$$ molecules.

Question 1

Which of the following best describes the main purpose of using dimensional analysis in chemistry?

Accepted Answer

To convert between different units and ensure calculations are consistent with significant figures.

Question 2

A student mixes solutions of silver nitrate and sodium chloride, resulting in the formation of a white precipitate. What type of reaction is this?

Accepted Answer

Precipitation reaction

Question 3

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 4

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$CH_2O$$

Question 5

Which law states that energy cannot be created or destroyed, only transformed from one form to another?

Accepted Answer

First Law of Thermodynamics

Question 6

Which of the following best explains why water has a higher boiling point than methane ($$CH_4$$)?

Accepted Answer

Water molecules form hydrogen bonds, which are stronger than the London dispersion forces in methane.

Question 7

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. What volume will it occupy at 2.0 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

$$1.0\ \mathrm{L}$$

Question 8

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 9

Which of the following is the correct balanced equation for the combustion of methane ($$CH_4) in $$oxygen?

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 10

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 500.0 mL of solution. What is the molarity of the solution? ($$M_{NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 11

Which of the following best describes the VSEPR theory?

Accepted Answer

It predicts the shapes of molecules based on electron pair repulsion.

Question 12

Which of the following is a colligative property?

Accepted Answer

Boiling point elevation

Question 13

A reaction releases 250 kJ of heat to the surroundings. Which of the following statements is true?

Accepted Answer

The reaction is exothermic and $$\Delta H is $$negative.

Question 14

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)$$

Question 15

Which of the following best explains why salt is spread on icy roads in winter?

Accepted Answer

Salt lowers the freezing point of water, causing ice to melt at lower temperatures.

Question 16

Which of the following is a correct application of the mole concept?

Accepted Answer

One mole of $$CO_2$$ contains $$6.022 	imes 10$$^{23}$$ molecules.

Question 17

Which of the following is a real-world example of an oxidation-reduction reaction?

Accepted Answer

The rusting of iron in the presence of oxygen and water.

Question 18

Which of the following statements about intermolecular forces is correct?

Accepted Answer

Hydrogen bonding is stronger than London dispersion forces.

Question 19

A 5.00 g sample of magnesium reacts with excess hydrochloric acid to produce hydrogen gas. How many moles of hydrogen gas are produced? ($$Mg + 2HCl \rightarrow $$MgCl_2$$ + H_2$, M$$_{Mg} = 24.31\ \mathrm{g/mol}$$)

Accepted Answer

$$0.103\ \mathrm{mol}$$

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