Question 1

Which of the following is the correct empirical formula for a compound containing 1.2 g of carbon and 0.24 g of hydrogen?

Accepted Answer

$$\mathrm{CH_2$}$$

Question 2

A student is asked to prepare 0.500 L of a 0.30 M glucose ($$\mathrm{C_6H_{12}O_6$}) $$solution for intravenous injection. What mass of glucose is required?

Accepted Answer

$$27.0\ \mathrm{g}$$

Question 3

Which of the following best describes the gas evolved when potassium carbonate reacts with hydroiodic acid?

Accepted Answer

A colorless, odorless gas that turns limewater milky

Question 4

Which of the following is the correct balanced chemical equation for the reaction between magnesium and hydrobromic acid?

Accepted Answer

$$\mathrm{Mg(s) + 2HBr(aq) \rightarrow $$MgBr_2$$(aq) + H_2$(g)}$$

Question 5

Which of the following compounds is soluble in water?

Accepted Answer

$$\mathrm{KCl}$$

Question 6

What ions are formed when $$\mathrm{Na_2SO_4} is $$dissolved in water?

Accepted Answer

$$2\ \mathrm{Na^+}$$ \, and \, 1\ \mathrm{$$SO_4$$^{2-}}$

Question 7

A sample of $$0.53\ \mathrm{g} of $$carbon dioxide was obtained by heating $$1.31\ \mathrm{g} of $$calcium carbonate. What is the percent yield for this reaction? (Molar mass $$\mathrm{$$CaCO_3$$} = 100.1\ \mathrm{g/mol}$$, $$\mathrm{CO_2$} = 44.0\ \mathrm{g/mol})$$

Accepted Answer

$$91.6\%$$

Question 8

Which of the following is NOT a physical property of a substance?

Accepted Answer

Combustion

Question 9

Which of the following is the correct chemical formula for iron(II) nitrite?

Accepted Answer

$$\mathrm{Fe(NO_2$)_2}$$

Question 10

How many atoms are present in $$12\ \mathrm{g} of$$ $$\mathrm{Cl_2$}$$? (Molar mass $$\mathrm{Cl_2$} = 70.9\ \mathrm{g/mol}$$, Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$2.04 	imes 10$$^{23}$$

Question 11

Which of the following best describes the change when milk goes sour?

Accepted Answer

Chemical change

Question 12

Which of the following is the correct chemical formula for nickel(II) sulfate?

Accepted Answer

$$\mathrm{$$NiSO_4$$}$$

Question 13

Which ions are formed when $$\mathrm{Al_2$(SO_4$)_3} is $$dissolved in water?

Accepted Answer

$$2\ \mathrm{Al$$^{3+}$$}$$ \, and \, 3\ \mathrm{$$SO_4$$^{2-}}$

Question 14

Which of the following best describes the ions formed when $$\mathrm{H_2SO_4} is $$dissolved in water?

Accepted Answer

$$2\ \mathrm{H^+}$$ \, and \, 1\ \mathrm{$$SO_4$$^{2-}}$

Question 15

Which of the following is the correct balanced equation for the reaction of potassium hydroxide being neutralized by hydrobromic acid?

Accepted Answer

$$\mathrm{KOH(aq) + HBr(aq) \rightarrow KBr(aq) + H_2O(l)}$$

Question 16

A beaker has a mass of $$34.05\ \mathrm{g}. $$After adding $$10.00\ \mathrm{mL} of $$water, the mass is $$37.00\ \mathrm{g}. $$What is the mass of the water added?

Accepted Answer

$$2.95\ \mathrm{g}$$

Question 17

Which of the following is the most concentrated solution?

Accepted Answer

$$11.0\ \mathrm{M}\ \mathrm{HCl}$$

Question 18

Which piece of glassware should you use to measure a solution precisely?

Accepted Answer

A graduated cylinder

Question 19

Which of the following best describes the ions formed when $$\mathrm{HI} is $$dissolved in water?

Accepted Answer

$$\mathrm{H^+}$$ \, and \, \mathrm{I^-}$

Question 20

Which of the following is the correct classification for argon (Ar)?

Accepted Answer

A noble gas

General Chemistry Lab Study Guide – Step-by-Step Guidance

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