Question 1

Which of the following Lewis structures correctly represents dichloromethane (CH2Cl2)?

Accepted Answer

The structure with a central carbon atom single-bonded to two hydrogens and two chlorines, with each chlorine having three lone pairs of electrons.

Question 2

Refer to the balloon diagram (A, B, C). If a balloon is placed in a chamber where the pressure is decreased while temperature remains constant, which balloon (A, B, or C) best represents the new volume of the balloon?

Accepted Answer

Balloon C (largest volume)

Question 3

Which of the following best explains why the O-H bond in water is polar?

Accepted Answer

Oxygen is much more electronegative than hydrogen.

Question 4

A sample of gas in a 5.00 L container at 1.50 atm is converted to mmHg. What is the pressure in mmHg? Use $$1\ 	ext{atm} = 760\ 	ext{mmHg}.$$

Accepted Answer

$$507\ 	ext{mmHg}$$

Question 5

Which of the following compounds will be insoluble in water?

Accepted Answer

PbS

Question 6

What is the molarity of a solution containing 17 g of NH3 in 0.50 L of solution? (Molar mass of NH3 = 17 g/mol)

Accepted Answer

$$2.0\ 	ext{M}$$

Question 7

A solution is prepared by dissolving 2 g of KCl in 100 g of H2O. In this solution, H2O is the:

Accepted Answer

Solvent

Question 8

Which of the following best describes the process of osmosis?

Accepted Answer

Solvent moves through a semipermeable membrane into an area of higher solute concentration.

Question 9

Which of the following is a property of a solid?

Accepted Answer

The particles have fixed positions and are very close together.

Question 10

A patient needs to receive 85 grams of glucose every 12 hours. What volume of a 5.0% (m/v) glucose solution needs to be administered to the patient each 12 hours?

Accepted Answer

$$1700\ 	ext{mL}$$

Question 11

Which of the following best describes the strongest intermolecular forces present in hydrogen chloride (HCl)?

Accepted Answer

Dipole-dipole attractions

Question 12

Which of the following is the correct formula for the oxide ion?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 13

A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from 25 °C to 35 °C, at constant amount of gas and pressure. What was its new volume? (Use Charles's Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$, temperatures in Kelvin)

Accepted Answer

$$5.17\ 	ext{L}$$

Question 14

Which of the following is a chemical change?

Accepted Answer

Burning sugar

Question 15

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Study Guidance: Lewis Structures and Gas Laws

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