Question 1

Which of the following statements best describes the difference between a compound and a mixture?

Accepted Answer

A compound has a fixed, definite composition, while a mixture can have variable composition.

Question 2

A student weighs a sample of gold and records its mass as 12.1435 g using a balance accurate to the fourth decimal place. How many significant figures should the student report for this measurement?

Accepted Answer

6 significant figures

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

Iron reacting with hydrochloric acid to produce hydrogen gas

Question 4

A sample contains 35.51% C, 4.77% H, 37.85% O, 8.29% N, and 13.60% Na by mass. What is the empirical formula of this compound?

Accepted Answer

$$\mathrm{C_5H_8NNaO_4}$$

Question 5

Which of the following ions is a polyatomic cation?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 6

A 13.58 g sample of $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$ contains how many hydrogen atoms? (Molar mass $$= 249.68 g/$$mol)

Accepted Answer

$$4.41 	imes 10$$^{23}$$

Question 7

Which of the following best describes the law of multiple proportions?

Accepted Answer

If two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in ratios of small whole numbers.

Question 8

A solution is prepared by diluting 52.10 mL of 0.178 M HCl to a final concentration of 0.132 M. What is the final volume of the solution?

Accepted Answer

$$70.3 mL$$

Question 9

Which of the following is the correct balanced equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(g)}$$

Question 10

A sample of chlorine contains 77.4% $$^{35}\mathrm{Cl} ($$mass = 35 amu) and 22.6% $$^{37}\mathrm{Cl} ($$mass = 37 amu). What is the average atomic mass of chlorine?

Accepted Answer

$$35.5$$ amu

Question 11

Which of the following is the correct name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 12

How many moles of $$\mathrm{CO_2$}$$ are produced when 11.0 moles of $$\mathrm{C_8H_{18}}$$ are burned, according to the balanced equation: $$2\mathrm{C_8H_{18}} + 25\mathrm{O_2$} \rightarrow 16\mathrm{CO_2$} + 18\mathrm{H_2O}$$?

Accepted Answer

$$88.0$$ moles

Question 13

Which of the following is an intensive property?

Accepted Answer

Density

Question 14

A 200.0 g sample of solution contains 390 mg of sodium ion. What is the concentration in ppm?

Accepted Answer

$$1.95 	imes 10^3$ ppm

Question 15

Which of the following is the empirical formula for a compound with 40.1% C, 6.6% H, and 53.3% O by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 16

Which of the following is the correct formula for the ion formed when sulfur gains two electrons?

Accepted Answer

$$\mathrm{S$$^{2-}$$}$$

Question 17

What is the percent composition by mass of oxygen in $$\mathrm{C_7H_{12}O_2$}$$? (Molar mass = 128.17 g/mol)

Accepted Answer

24.97%

Question 18

Which of the following is the correct name for $$\mathrm{$$HClO_4$$}$$?

Accepted Answer

Perchloric acid

Question 19

A sample contains $$2.25 	imes 10$$^{22}$$ tungsten (W) atoms. What is the mass of this sample? (Atomic mass of W = 183.9 g/mol)

Accepted Answer

$$6.87 g$$

General Chemistry: Matter, Atoms, Molecules, and Chemical Quantities

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