Q: Which of the following is the correct symbol for a cation with a mass number of 56, atomic number 30, and a charge of $2+$?

$\displaystyle \begin{array}{c} 56 \\ \text{Zn}^{2+} \\ 30 \end{array}$

Q: Which of the following is a balanced equation for the complete combustion of propane ($\text{C}_3\text{H}_8$)?

$\text{C}_3\text{H}_8 + 5\text{O}_2 \rightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}$

Q: Which of the following is the correct balanced equation for the reaction of lithium metal with water?

$2\text{Li}(s) + 2\text{H}_2\text{O}(l) \rightarrow 2\text{LiOH}(aq) + \text{H}_2(g)$

Q: Which of the following is the correct balanced equation for the reaction of water with sulfur trioxide to form sulfuric acid?

$\text{SO}_3(g) + \text{H}_2\text{O}(l) \rightarrow \text{H}_2\text{SO}_4(aq)$

Question 1

A diamond weighs 1.0 carat. Given that $1 \ 	ext{carat} = 0.200 \ 	ext{g}$ and the density of diamond is $3.51 \ 	ext{g/cm}^3$, what is the volume of this diamond in $	ext{cm}^3$?

Accepted Answer

$0.0570 \ 	ext{cm}^3$

Question 2

The coolant in a car radiator freezes at $-39^\circ 	ext{C}$. What is this temperature in Fahrenheit? Use the formula $F = \frac{9}{5}C + 32$.

Accepted Answer

$-38.2^\circ 	ext{F}$

Question 3

Which of the following is the correct symbol for a cation with a mass number of 56, atomic number 30, and a charge of $2+$?

Accepted Answer

$\displaystyle \begin{array}{c} 56 \ 	ext{Zn}^{2+} \ 30 \end{array}$

Question 4

How many moles of gold are present in $196.97 \ 	ext{kg}$ of Au? (Molar mass of Au = $196.97 \ 	ext{g/mol}$)

Accepted Answer

$1000.0 \ 	ext{mol}$

Question 5

What percentage of $	ext{CO}_2$ is oxygen by mass? (Atomic masses: C = 12.01, O = 16.00)

Accepted Answer

$72.71\%$

Question 6

A scientist expects to produce $97.8 \ 	ext{kg}$ of ammonia but only obtains $90.9 \ 	ext{kg}$. What is the percent yield?

Accepted Answer

$92.9\%$

Question 7

A recipe for 1 cup of hollandaise sauce requires $\frac{1}{2}$ cup butter, $\frac{1}{4}$ cup hot water, 4 egg yolks, and the juice of 1 lemon. If you have 2 cups of butter, 2 dozen eggs, and 12 lemons, how many cups of sauce can you make?

Accepted Answer

8 cups

Question 8

You have a $1.000 \ 	ext{g/L}$ stock solution of $	ext{Pb}^{2+}$. What volume of this solution should be diluted to $500.0 \ 	ext{mL}$ to make a solution with $100.0 \ 	ext{mg/L}$ $	ext{Pb}^{2+}$?

Accepted Answer

$5.000 \ 	ext{mL}$

Question 9

When aqueous solutions of sodium chloride and silver nitrate are mixed, what is observed?

Accepted Answer

It becomes cloudy due to the formation of solid silver chloride.

Question 10

How many grams of sodium hydroxide are needed to prepare $100.00 \ 	ext{mL}$ of a $5.00 \ 	ext{M}$ solution? (Molar mass of NaOH = $40.0 \ 	ext{g/mol}$)

Accepted Answer

$20.0 \ 	ext{g}$

Question 11

Which of the following compounds is insoluble in water according to the solubility rules provided?

Accepted Answer

$	ext{AgCl}$

Question 12

Which of the following is a balanced equation for the complete combustion of propane ($	ext{C}_3	ext{H}_8$)?

Accepted Answer

$	ext{C}_3	ext{H}_8 + 5	ext{O}_2 ightarrow 3	ext{CO}_2 + 4	ext{H}_2	ext{O}$

Question 13

Which of the following is the correct balanced equation for the reaction of lithium metal with water?

Accepted Answer

$2	ext{Li}(s) + 2	ext{H}_2	ext{O}(l) ightarrow 2	ext{LiOH}(aq) + 	ext{H}_2(g)$

Question 14

A sample of limonene ($0.671 \ 	ext{g}$) produces $2.168 \ 	ext{g}$ $	ext{CO}_2$ and $0.710 \ 	ext{g}$ $	ext{H}_2	ext{O}$ upon combustion. If the molar mass of limonene is $136.24 \ 	ext{g/mol}$, what is its molecular formula?

Accepted Answer

$	ext{C}_{10}	ext{H}_{16}$

Question 15

Which of the following is the correct balanced equation for the reaction of water with sulfur trioxide to form sulfuric acid?

Accepted Answer

$	ext{SO}_3(g) + 	ext{H}_2	ext{O}(l) ightarrow 	ext{H}_2	ext{SO}_4(aq)$

Question 16

Acid rain erodes marble statues via the reaction: $	ext{CaCO}_3(s) + 	ext{H}_2	ext{SO}_4(aq) ightarrow 	ext{CaSO}_4(s) + 	ext{CO}_2(g) + 	ext{H}_2	ext{O}(l)$. If $30.75 \ 	ext{mL}$ of $0.0100 \ 	ext{M}$ $	ext{H}_2	ext{SO}_4$ is added to $20.00 \ 	ext{mg}$ of $	ext{CaCO}_3$, which reactant is limiting?

Accepted Answer

$	ext{CaCO}_3$ is limiting

Question 17

Which of the following is NOT one of the seven diatomic elements?

Accepted Answer

$	ext{Ne}_2$

Question 18

A Martian rover is $4.0 \ 	ext{ft}$ from a rock and moves at $200.0 \ 	ext{m/sol}$ ($1 \ 	ext{sol} = 24.65 \ 	ext{h}$). How many minutes does it take to move to $2.0 \ 	ext{ft}$ from the rock? ($1 \ 	ext{ft} = 30.5 \ 	ext{cm}$)

Accepted Answer

$0.305 \ 	ext{min}$

General Chemistry Exam 1 Study Guidance

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