Q: Which of the following is the correct formula for molarity?

$M = \frac{\text{moles of solute}}{\text{volume of solution (L)}}$

Question 1

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid, insoluble product forms and separates from the solution.

Question 2

What is the correct balanced chemical equation for the combustion of methane?

Accepted Answer

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

Question 3

Which compound is insoluble in water according to the solubility rules?

Accepted Answer

AgCl

Question 4

When baking powder is used in cake recipes, which gas is produced that causes the cake to rise?

Accepted Answer

Carbon dioxide

Question 5

What is the oxidation state of chromium in $\mathrm{Cr_2O_7^{2-}}$?

Accepted Answer

+6

Question 6

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Question 7

A solution is prepared by dissolving 0.255 mol of NaOH in water to make 2.04 L of solution. What is the molarity of the solution?

Accepted Answer

$0.125\ \mathrm{mol\ L^{-1}}$

Question 8

Which of the following is the net ionic equation for the reaction between Pb(NO$_3$)$_2$(aq) and KI(aq)?

Accepted Answer

$\mathrm{Pb^{2+}(aq) + 2I^-(aq) \rightarrow PbI_2(s)}$

Question 9

How many moles of NaCl are present in 2.0 L of a 0.5 M NaCl solution?

Accepted Answer

$1.0\ \mathrm{mol}$

Question 10

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$\mathrm{\%\ yield = \frac{actual\ yield}{theoretical\ yield} 	imes 100\%}$

Question 11

In the reaction $\mathrm{2Mg(s) + O_2(g) \rightarrow 2MgO(s)}$, if you start with 42.5 g of Mg and 33.8 g of O$_2$, what is the limiting reactant?

Accepted Answer

Mg

Question 12

Which of the following best describes an oxidation-reduction (redox) reaction?

Accepted Answer

A reaction in which electrons are transferred between reactants.

Question 13

What is the molarity of a solution prepared by diluting 0.150 L of a 10.0 M CaCl$_2$ stock solution to a final volume of 3.00 L?

Accepted Answer

$0.500\ \mathrm{mol\ L^{-1}}$

Question 14

Which of the following is a weak acid?

Accepted Answer

CH$_3$COOH

Question 15

What is the net ionic equation for the neutralization of HCl(aq) with NaOH(aq)?

Accepted Answer

$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$

Question 16

If 0.108 mol of Na$_2$CO$_3$ reacts with HNO$_3$ according to $\mathrm{Na_2CO_3(aq) + 2HNO_3(aq) \rightarrow 2NaNO_3(aq) + CO_2(g) + H_2O(l)}$, how many moles of HNO$_3$ are required?

Accepted Answer

$0.216\ \mathrm{mol}$

Question 17

Which of the following is the correct oxidation state for oxygen in most compounds?

Accepted Answer

-2

Question 18

In the redox reaction $\mathrm{Mn^{2+}(aq) \rightarrow MnO_4^-(aq)}$, what happens to the oxidation state of manganese?

Accepted Answer

It increases from +2 to +7.

Question 19

Which of the following is the correct formula for molarity?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{volume of solution (L)}}$

Chemical Reactions and Stoichiometry: Study Notes for CHY 102

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