Question 1

Which of the following statements best describes the organization of subatomic particles in an atom according to modern atomic theory?

Accepted Answer

Protons and neutrons are tightly packed in a small nucleus. Electrons occupy the space outside the nucleus.

Question 2

A student dissolves 100.0 g of CoCl$_2$ in enough water to make 5.50 L of solution. What is the molarity of the resulting cobalt(II) chloride solution? (Molar mass of CoCl$_2$ = 129.84 g/mol)

Accepted Answer

$0.154\ \mathrm{mol/L}$

Question 3

Which of the following reactions is NOT balanced?

Accepted Answer

$\mathrm{SF}_4 + 3\ \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}_2\mathrm{SO}_3 + 4\ \mathrm{HF}$

Question 4

According to Arrhenius, an acid and a base will react to always give:

Accepted Answer

a salt plus water.

Question 5

Which of the following compounds would be insoluble in water based on solubility rules?

Accepted Answer

$\mathrm{CaCO}_3$

Question 6

A sample of boron contains two isotopes: boron-10 (10.01 amu, 20%) and boron-11 (11.00 amu, 80%). What is the average atomic mass of boron?

Accepted Answer

$10.81\ \mathrm{amu}$

Question 7

What is the oxidation number of bismuth in $\mathrm{Bi}_2\mathrm{O}_7$?

Accepted Answer

$+6$

Question 8

Which of the following is a correct net ionic equation for the reaction between $\mathrm{Sr(NO}_3)_2$ and $\mathrm{K}_2\mathrm{SO}_4$?

Accepted Answer

$\mathrm{Sr}^{2+} (aq) + \mathrm{SO}_4^{2-} (aq) \rightarrow \mathrm{SrSO}_4 (s)$

Question 9

A 0.256 M thiosulfate solution is used to titrate 1.50 L of 0.0731 M iodine solution according to the reaction:

$\mathrm{I}_2 (aq) + 2\ \mathrm{S}_2\mathrm{O}_3^{2-} (aq) \rightarrow 2\ \mathrm{I}^- (aq) + \mathrm{S}_4\mathrm{O}_6^{2-} (aq)$

What volume of thiosulfate solution is required for complete reaction?

Accepted Answer

$0.857\ \mathrm{L}$

Question 10

Which of the following is the correct empirical formula for a compound that is 54.54% C, 9.09% H, and 36.36% O by mass?

Accepted Answer

$\mathrm{C}_2\mathrm{H}_4\mathrm{O}$

Question 11

Which of the following is a postulate of Dalton's atomic theory that has been modified in light of later discoveries?

Accepted Answer

Atoms of a given element are identical.

Question 12

A gas sample has a pressure of 760 mmHg, a volume of 2.00 L, and a temperature of 273 K. How many moles of gas are present? ($R = 0.08206\ \mathrm{L\cdot atm\cdot mol^{-1}\cdot K^{-1}}$)

Accepted Answer

$0.0892\ \mathrm{mol}$

Question 13

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

Accepted Answer

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

Question 14

A 1.00 L sample of a gas at 25$^\circ$C and 1.00 atm is compressed to 0.500 L and heated to 50$^\circ$C. What is the final pressure of the gas? (Assume ideal gas behavior.)

Accepted Answer

$2.12\ \mathrm{atm}$

Question 15

Which of the following is the correct formula for lithium permanganate?

Accepted Answer

$\mathrm{LiMnO}_4$

Question 16

What is the percent composition by mass of carbon in DEET ($\mathrm{C}_{12}\mathrm{H}_{17}\mathrm{NO}$, molar mass = 191 g/mol)?

Accepted Answer

$60.2\%$

Question 17

When the equation $\mathrm{C}_3\mathrm{H}_8 + \mathrm{O}_2 \rightarrow \mathrm{CO}_2 + \mathrm{H}_2\mathrm{O}$ is balanced with the lowest whole number coefficients, what is the coefficient of $\mathrm{O}_2$?

Accepted Answer

$5$

Question 18

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 19

Which of the following is the correct molarity for a solution made by diluting 0.450 L of 0.450 M K$_2$CO$_3$ to a final volume of 0.315 L?

Accepted Answer

$0.635\ \mathrm{M}$

General Chemistry Study Guide: Constants, Units, Atomic Theory, Chemical Reactions, and Problem Solving

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