Q: Which of the following statements about acids and bases is correct?

A solution with $$[\mathrm{H^+}] = 1 \times 10$$^{-3}$$\ \mathrm{M}$$ has a pH of 3 and is acidic.

Question 1

Which of the following is a chemical change rather than a physical change?

Accepted Answer

Iron rusting in moist air

Question 2

What is the correct name for the compound with the formula $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 3

An atom of carbon-14 is represented as $$\mathrm{^{14}_{6}C}. $$How many neutrons does it have?

Accepted Answer

8

Question 4

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 5

Which of the following is the correct balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?

Accepted Answer

$$4\mathrm{Al} + 3\mathrm{O}_2 \rightarrow 2\mathrm{Al}_2\mathrm{O}_3$$

Question 6

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

Accepted Answer

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

Question 7

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{H_2O}$$

Question 8

Which of the following best describes hydrogen bonding?

Accepted Answer

An attraction between a hydrogen atom bonded to N, O, or F and a lone pair on another N, O, or F atom

Question 9

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? ($$\mathrm{M_{NaCl}} = 58.44\ g/mol)$$

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 10

Which of the following statements about acids and bases is correct?

Accepted Answer

A solution with $$[\mathrm{H^+}] = 1 	imes 10$$^{-3}$$\ \mathrm{M}$$ has a pH of 3 and is acidic.

Question 11

Which of the following is the correct electron configuration for a chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 12

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so 'like dissolves like' does not apply.

Question 13

A sample of gas occupies 2.00 L at 1.00 atm and 300 K. What will be its volume at 2.00 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

1.00 L

Question 14

Which of the following is the correct name for $$\mathrm{C_2H_6}$$?

Accepted Answer

Ethane

Question 15

Which functional group is present in the compound $$\mathrm{CH_3COOH}$$?

Accepted Answer

Carboxylic acid

Question 16

Which of the following pairs are isomers?

Accepted Answer

$$\mathrm{C_4H_{10}} ($$butane) and $$\mathrm{C_4H_{10}} ($$isobutane)

Question 17

A radioactive isotope has a half-life of 3 days. If you start with 80 g, how much remains after 9 days?

Accepted Answer

10 g

Question 18

A student measures the mass of a sample as 12.30 g and the volume as 4.0 mL. What is the density, reported with the correct number of significant figures?

Accepted Answer

$$3.1\ \mathrm{g/mL}$$

Question 19

What is the empirical formula of a compound that is 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 20

A reaction has a theoretical yield of 25.0 g, but only 18.0 g of product is actually obtained. What is the percent yield?

Accepted Answer

$$72.0\%$$

Comprehensive Final Exam Review: Introduction to Chemistry

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