Q: A student measures the mass of a sample as $$2.50 \text{ g}$$ and its volume as $$0.200 \text{ mL}. $$What is the density of the sample, and will it float in water (density $$= 1.00 \text{ g/mL}$$)?

Density $$= 12.5 \text{ g/mL}$$; it will sink

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

$$\text{H}^+(aq) + \text{OH}^-(aq) \rightarrow \text{H}_2\text{O}(l)$$

Q: Which of the following is a correct balanced equation for the combustion of pentane ($$\text{C}_5\text{H}_{12}$$)?

$$\text{C}_5\text{H}_{12} + 8\text{O}_2 \rightarrow 5\text{CO}_2 + 6\text{H}_2\text{O}$$

Q: Which of the following is a correct example of a limiting reagent problem?

Combining $$33.2 \text{ g} of Na $$and $$63.8 \text{ g} of Cl$_2 to $$form NaCl and calculating the percent yield

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A student measures the mass of a sample as $$2.50 	ext{ g}$$ and its volume as $$0.200 	ext{ mL}. $$What is the density of the sample, and will it float in water (density $$= 1.00 	ext{ g/mL}$$)?

Accepted Answer

Density $$= 12.5 	ext{ g/mL}$$; it will sink

Question 3

Which of the following is a homogenous mixture?

Accepted Answer

Dissolved sugar in water

Question 4

What is the correct formula for the compound formed between barium and phosphate ions?

Accepted Answer

$$	ext{Ba}_3(	ext{PO}_4)_2$$

Question 5

A sample contains $$285.0 	ext{ g} of $$solvent and $$85.0 	ext{ g} of $$solute. What is the percent by mass of solute in the sample?

Accepted Answer

$$25.0\%$$

Question 6

Which of the following is the correct name for $$	ext{SF}_6$$?

Accepted Answer

Sulfur hexafluoride

Question 7

What is the molar mass of caffeine ($$	ext{C}_8	ext{H}_{10}	ext{N}_4	ext{O}_2$$)?

Accepted Answer

$$194.2 	ext{ g/mol}$$

Question 8

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

Accepted Answer

$$	ext{H}^+(aq) + 	ext{OH}^-(aq) ightarrow 	ext{H}_2	ext{O}(l)$$

Question 9

A student needs to dilute $$0.100 	ext{ L} of a$$ $$15.0 	ext{ M}$$ NaOH solution to obtain a $$1.0 	ext{ M}$$ solution. What should the final volume be?

Accepted Answer

$$1.5 	ext{ L}$$

Question 10

Which of the following is the correct formula for the compound formed between magnesium and sulfur?

Accepted Answer

$$	ext{MgS}$$

Question 11

How many molecules of $$	ext{CO}_2$$ are released when $$750 	ext{ g} of $$dry ice sublimates? (Molar mass of $$	ext{CO}_2 = 44.009 	ext{ g/mol}$$, Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.0 	imes 10$$^{25}$$

Question 12

Which of the following is a correct balanced equation for the combustion of pentane ($$	ext{C}_5	ext{H}_{12}$$)?

Accepted Answer

$$	ext{C}_5	ext{H}_{12} + 8	ext{O}_2 ightarrow 5	ext{CO}_2 + 6	ext{H}_2	ext{O}$$

Question 13

Which of the following is the correct percent composition of sodium in NaCl? (Na: $$22.99 	ext{ g/mol}$$, Cl: $$35.45 	ext{ g/mol})$$

Accepted Answer

$$39.3\%$$

Question 14

Which of the following is the correct oxidation state of sulfur in $$	ext{SO}_3$$?

Accepted Answer

$$+6$$

Question 15

A solution is made by mixing $$41.1 	ext{ mL} of$$ $$1.03 	ext{ M}$$ NaCl and $$66.2 	ext{ mL} of$$ $$0.818 	ext{ M}$$ CaCl$$_2$$, then diluting to $$150.0 	ext{ mL}. $$What is the final concentration of Cl$$^-$$ ions?

Accepted Answer

$$1.00 	ext{ M}$$

Question 16

Which of the following is the correct formula for ammonium chloride?

Accepted Answer

$$	ext{NH}_4	ext{Cl}$$

Question 17

Which of the following is a correct example of a limiting reagent problem?

Accepted Answer

Combining $$33.2 	ext{ g} of Na $$and $$63.8 	ext{ g} of Cl$_2 to $$form NaCl and calculating the percent yield

Question 18

Which of the following is the correct name for $$	ext{N}_2	ext{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

General Chemistry 101: Foundations of Matter, Measurement, and Chemical Reactions

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