Q: Which of the following correctly rearranges the Combined Gas Law equation to solve for the second temperature $$T_2$$?

$$T_2$$ = \frac{$$P_2$$ \times $$V_2$$ \times $$T_1$$}{$$P_1$$ \times $$V_1$$}$$

Question 1

Which of the following correctly rearranges the Combined Gas Law equation to solve for the second temperature $$T_2$$?

Accepted Answer

$$T_2$$ = \frac{$$P_2$$ 	imes $$V_2$$ 	imes $$T_1$$}{$$P_1$$ 	imes $$V_1$$}$$

Question 2

What is the osmolarity of an aqueous 0.12 M Ba(NO$$_3$$)$$_2$$ solution?

Accepted Answer

0.36 osmolar

Question 3

A sample of helium gas has a volume of 3.57 L at 250°C. What is the temperature of this gas (in degrees Celsius) at constant pressure when the volume expands to 6.42 L?

Accepted Answer

$$263^\circ \mathrm{C}$$

Question 4

What is the molar mass for Sodium Sulfate?

Accepted Answer

142.05 g/mol

Question 5

How many grams of iron are present in 75.0 grams of Fe$$_2O$_3$$? (Molar Mass(Fe$$_2O$_3) = 159.70 g/$$mol)

Accepted Answer

34.9 g Fe

Question 6

Which of the following molecules in the pure liquid state would be expected to hydrogen bond?

Accepted Answer

1 only

Question 7

Rank the following compounds in terms of increasing boiling point: Ethanol, Propane, Dimethylether.

Accepted Answer

Propane \u003c Dimethylether \u003c Ethanol

Question 8

Which phase change listed below represents the transition from the gaseous state to the solid state?

Accepted Answer

Deposition

Question 9

A cucumber is placed in a hypertonic solution. What will happen?

Accepted Answer

It undergoes crenation

Question 10

After carefully noting the orientation in which water surrounds each solute particle, which choice best represents the true nature of how CaCl$$_2$$ exists in aqueous solution?

Accepted Answer

Ca$$^{2+}$$ surrounded by water molecules with O atoms facing the ion; Cl$$^-$$ surrounded by water molecules with H atoms facing the ion

Question 11

How many grams of Oxygen, O$$_2$$, are present in $$3.6 	imes 10$$^{23}$$ molecules of O_2$? (Molar Mass(O_2$) = 32.00 g/mol)

Accepted Answer

1.9 g O$$_2$$

Question 12

Which of the following is a colligative property observed when acetic acid is added to water to make vinegar?

Accepted Answer

All of these properties are observed.

Question 13

Which aqueous solution would be expected to have the lowest freezing temperature?

Accepted Answer

0.78 M FeCl$$_3$$

Question 14

Nitrogen gas has very limited solubility in water. Under what condition(s) will the solubility of Nitrogen in water increase?

Accepted Answer

At lower temperatures and higher pressure

Question 15

What principal interaction is found between a molecule of pentane and a Lithium ion?

Accepted Answer

Ion-induced dipole

Question 16

A solution is prepared by dissolving 100.0 grams of KClO$$_3 in 300 $$grams of water at 70°C. The solubility limit for Potassium Chlorate at 70°C is 30.0 grams per 100 grams of water. What type of solution exists?

Accepted Answer

Supersaturated solution

Question 17

How many grams of KCl are required to prepare 42.0 mL of a 6.00% (w/v) KCl solution?

Accepted Answer

2.52 g KCl

Question 18

What is the final concentration of HCl if 25.0 mL of 11.9 M HCl is diluted to a total volume of 200 mL?

Accepted Answer

1.49 M

Question 19

Which of the following best explains why benzene and naphthalene are more soluble in toluene than in water?

Accepted Answer

They are nonpolar and dissolve better in nonpolar solvents due to similar intermolecular forces.

GOB Chemistry: Gases, Solutions, Intermolecular Forces, and Colligative Properties – Study Guide

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