Question 1

Which of the following best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds are formed by the transfer of electrons from metals to nonmetals, while covalent compounds are formed by the sharing of electrons between nonmetals.

Question 2

What is the simplified form of $$\frac{a$$^{-8}$$}{a$$^{3}$$}$$?

Accepted Answer

$$a^{-11}$$

Question 3

Which of the following reactions is NOT an oxidation-reduction (redox) reaction?

Accepted Answer

$$\mathrm{CO_2$\ (g) + 2\ LiOH\ (aq) \rightarrow Li_2CO_3\ (aq) + H_2O\ (l)}$$

Question 4

A solution is prepared by dissolving $$25.00\ \mathrm{g} of $$NaOH in $$150.0\ \mathrm{mL} of $$water. What is the molarity of the stock solution? (Molar mass of NaOH = $$40.00\ \mathrm{g/mol})$$

Accepted Answer

$$4.17\ \mathrm{M}$$

Question 5

After diluting $$50.0\ \mathrm{mL} of $$the NaOH stock solution to a total volume of $$400.0\ \mathrm{mL}$$, what is the concentration of NaOH in the diluted solution?

Accepted Answer

$$0.521\ \mathrm{M}$$

Question 6

If $$75.0\ \mathrm{mL} of $$the diluted NaOH solution is further diluted to a final volume of $$500\ \mathrm{mL}$$, what is the concentration of NaOH in the final solution?

Accepted Answer

$$0.078\ \mathrm{M}$$

Question 7

What is the total mass of NaOH (in grams) present in the final $$500\ \mathrm{mL}$$ solution described above?

Accepted Answer

$$1.56\ \mathrm{g}$$

Question 8

Which of the following statements is TRUE regarding the process of diluting a stock solution?

Accepted Answer

The number of moles of solute remains constant during dilution.

Question 9

What is the volume (in mL) of $$5.2\ \mathrm{M}$$ HBr needed to prepare $$3.5\ \mathrm{L} of$$ $$2.7\ \mathrm{M}$$ HBr?

Accepted Answer

$$1,817\ \mathrm{mL}$$

Question 10

Which equation is commonly used when preparing a diluted solution from a concentrated solution?

Accepted Answer

$$C_1V_1 = C_2V_2$$

Question 11

If you have $$5.2\ \mathrm{M}$$ HBr, what would happen if you used a volume greater than needed to prepare $$3.5\ \mathrm{L} of$$ $$2.7\ \mathrm{M}$$ HBr?

Accepted Answer

The solution would become more concentrated.

Question 12

What is the total number of moles of HBr in $$3.5\ \mathrm{L} of a$$ $$2.7\ \mathrm{M}$$ solution?

Accepted Answer

$$9.45\ \mathrm{moles}$$

Question 13

Which of the following is the correct formula for the compound formed when aluminum (Al) combines with sulfur (S)?

Accepted Answer

$$\mathrm{Al_2S_3}$$

Question 14

Which of the following is the correct name for the compound formed between the polycation ammonium and the nonmetal iodine?

Accepted Answer

Ammonium iodide

Question 15

Which statements about the hydrogen isotope with a mass number of 2 are accurate? (Select all that apply)

Accepted Answer

The isotope is a stable form of hydrogen.

Question 16

Given that $$8\ \mathrm{g} of $$substance A in $$100\ \mathrm{g} of $$solution is equivalent to $$10\ \mathrm{g} of $$substance A in $$X$$ grams of solution, what is the value of $$X$$?

Accepted Answer

$$125\ \mathrm{g}$$

Question 17

If the empirical formula of a compound is $$(\mathrm{C_3H_4O})$$ and its molar mass is found to be $$120.24\ \mathrm{g/mol}$$, what is its molecular formula?

Accepted Answer

$$(\mathrm{C_6H_8O_2})$$

Question 18

What is the molar mass of $$\mathrm{Na_3PO_4}$$?

Accepted Answer

$$163.94\ \mathrm{g/mol}$$

Question 19

How many moles of $$\mathrm{Na_3PO_4}$$ are present in $$300.0\ \mathrm{mL} of a$$ $$0.550\ \mathrm{M}$$ solution?

Accepted Answer

$$0.165\ \mathrm{moles}$$

Question 20

If the volume of a $$\mathrm{Na_3PO_4}$$ solution is doubled, what happens to the number of grams of $$\mathrm{Na_3PO_4} in $$the solution?

Accepted Answer

It would double.

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