Question 1

A sample of ethanol has a mass of 46.0 g and a volume of 58.0 mL. What is the density of ethanol, reported with the correct number of significant figures?

Accepted Answer

$$0.793\ \mathrm{g/mL}$$

Question 2

Which of the following correctly represents the net ionic equation for the reaction between aqueous solutions of sodium sulfate and barium chloride?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$BaSO_4$$(s)}$$

Question 3

A 25.0 mL sample of 0.200 M HCl is neutralized by 30.0 mL of NaOH solution. What is the molarity of the NaOH solution?

Accepted Answer

$$0.167\ \mathrm{M}$$

Question 4

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{AgCl}$$

Question 5

What is the oxidation number of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 6

Which of the following is the correct name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 7

How many molecules are present in 0.250 mol of $$\mathrm{CO_2$}$$?

Accepted Answer

$$1.51 	imes 10$$^{23}$$

Question 8

A student dilutes 10.0 mL of a 2.00 M NaCl solution to a final volume of 100.0 mL. What is the final concentration?

Accepted Answer

$$0.200\ \mathrm{M}$$

Question 9

Which of the following is the correct balanced chemical equation for the combustion of propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

$$\mathrm{C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O}$$

Question 10

Which of the following statements about redox reactions is correct?

Accepted Answer

The substance that is reduced acts as the oxidizing agent.

Question 11

A solution is prepared by dissolving 5.00 g of NaOH in enough water to make 250.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 12

Which of the following represents the correct oxidation half-reaction for the redox process: $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$?

Accepted Answer

$$\mathrm{Zn(s) \rightarrow Zn$$^{2+}$$(aq) + 2e^-}$$

Question 13

How many protons, neutrons, and electrons are present in a neutral atom of $$^{35}\mathrm{Cl}$$?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 14

Which of the following is the correct molecular formula for dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 15

A 50.0 mL sample of 0.100 M $$\mathrm{$$AgNO_3$$} is $$mixed with 50.0 mL of 0.100 M $$\mathrm{NaCl}. $$What mass of $$\mathrm{AgCl}$$ precipitate will form? ($$\mathrm{AgCl}$$ molar mass = 143.32 g/mol)

Accepted Answer

$$0.716\ \mathrm{g}$$

Question 16

Which of the following best describes the process of an acid-base neutralization reaction?

Accepted Answer

An acid reacts with a base to produce water and a salt.

Question 17

What is the molar mass of $$\mathrm{Ca(NO_3$)_2}$$?

Accepted Answer

$$164.10\ \mathrm{g/mol}$$

Question 18

A chemical reaction has the following unbalanced equation: $$\mathrm{C_2H_6 + O_2$ \rightarrow CO_2$ + H_2O}. $$What is the sum of the coefficients when the equation is balanced?

Accepted Answer

9

Question 19

A solution is made by mixing 100.0 mL of 0.500 M $$\mathrm{K_2SO_4}$$ with 100.0 mL of water. What is the final concentration of $$\mathrm{K_2SO_4}$$?

Accepted Answer

$$0.250\ \mathrm{M}$$

Question 20

Which of the following temperature conversions is correct?

Accepted Answer

$$T(\mathrm{K}) = T(\mathrm{^\circ C}) + 273.15$$

Exam 1 Study Guide: Chapters 1–4 (General Chemistry)

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