What type of quantity (for example, length, volume, density) do the following units indicate?

(a) mL 1 ---Select--- volume length area mass density time temperature	(b) cm2 2 ---Select--- volume length area mass density time temperature	(c) mm3 3 ---Select--- volume length area mass density time temperature
(d) mg/L 4 ---Select--- volume length area mass density time temperature	(e) ps 5 ---Select--- volume length area mass density time temperature	(f) nm 6 ---Select--- volume length area mass density time temperature
(g) K 7 ---Select--- volume length area mass density time temperature

The complete combustion of octane, C₈H₁₈, a component of gasoline, proceeds as is shown below.

2 C₈H₁₈(l) + 25 O₂(g) 16 CO₂(g) + 18 H₂O(l)

(a) How many moles of O₂ are needed to burn 1.70 mol of C₈H₁₈?

Enter a number with the correct number of significant figures.

1 mol
(b) How many grams of O₂ are needed to burn 2.85 g of C₈H₁₈?

Enter a number with the correct number of significant figures.

2 g
(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O₂ are required to burn 8.15 gal of C₈H₁₈?

Enter a number with the correct number of significant figures.

3 g

Acetone, CH₃COCH₃, is a nonelectrolyte; acetic acid, HC₂H₃O₂, is a weak electrolyte; and nitric acid, HNO₃, is a strong electrolyte. What are the solute particles present in aqueous solutions of each compound? (Select all that apply.) If 0.1 mol of each compound is dissolved in solution, which one contains 0.2 mol of solute particles, which contains 0.1 mol of solute particles, and which contains somewhere between 0.1 and 0.2 mol of solute particles?

0.2 mol solute particles	4 ---Select--- acetone acetic acid nitric acid
0.1 mol solute particles	5 ---Select--- acetone acetic acid nitric acid
between 0.1 and 0.2 mol solute particles	6 ---Select--- acetone acetic acid nitric acid

Write electron configurations for the following ions, and determine which have noble-gas configurations. (Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s²3d¹⁰4p². If the configuration is a noble gas, enter the noble gas in brackets, for example [Ne] for F ^-.)

(a) O^2-

Answer is case sensitive.

1
(b) Ga³⁺

Answer is case sensitive.

2
(c) Te^2-

Answer is case sensitive.

3
(d) Tl⁺

Answer is case sensitive.

4
(e) Se³⁺

Answer is case sensitive.

5
(f) Pb²⁺

Answer is case sensitive.

6

Which of the following nuclides would you expect to be radioactive? (Select all that apply.)

Justify your choices.
2