States of matter
The only intermolecular force that occurs between nonpolar molecules is
London dispersion forces
What type of solution has the maximum amount of solute that it can hold at a given temperature?
A saturated solution
What are the standard conditions of temperature and pressure (STP)?
0℃; 1 atm
Which of the following is an endothermic process?
A. Melting Ice
Kinetics is a study of ___
rate of reactions.
_____ is the weakest intermolecular force; _____ is the strongest intermolecular force.
London dispersion; hydrogen bonding
Colligative properties of a solution depend on the
D. Concentration of the solute
If a gas occupies a volume of 725.0 mL at a pressure of 805 torr, what will the new volume be if the pressure is raised to 960. torr?
609 mL
How many kilocalories are in a piece of pie with 23.0 g carbohydrates, 8.0 g fat, and 3.0 g of protein? (1 g fat = 9 kcal; 1 g carbs = 4 kcal; 1 g of protein = 4 kcal)
176 kcal
Which of the following factors increases the rate of reaction?
B. Adding a catalyst
Using the definition of colligative properties, explain why it is beneficial to add salt to the roads in the winter.
Adding salt lowers water’s freezing point, so ice melts even when it’s below 0 °C.
An 8.0 gram sample of carbon dioxide is dissolved into 2.5 liters of water. What is the molarity of the solution?
0.073 M
A 7.5-gram sample of methane, CH4, has a pressure of 1.7 atA 7.5-gram sample of methane, CH4, has a pressure of 1.7 atm at a temperature of 24.0 °C.
6.70 L
When drawing an reaction energy curve, what represents the activation energy
Distance from reactants to top of hum (transition state)
When a reaction has a large Keq value this indicates that
The concentration of the reactants is lower than the concentration of the products
Which of the following has a defined molecular shape?
gas
liquid
crystalline solid
amorphous solid
Crystalline solid
How many grams of sugar is needed to make 350. mL of a 33% w/v solution?
115.5 g sugar
The partial pressures of a mixture of gases are: 408 mmHg of nitrogen, 125 mmHg of oxygen, and 118 mmHg of carbon dioxide. What is the total pressure of the gas in atmospheres? (Use proper dimensional analysis for full credit. Hint: 1 atm = 760 mm Hg
0.858 atm
The heat of fusion (ΔHfus) of water is 334 J/g. How much energy is required to melt 75 grams of ice into liquid water?
2505 J
Write the equilibrium constant expression (Keq) expression for the following reactions (4 points each = 8 points):
2 N2 (g) + 5 O2 (g) ⇌ 2 N2O5 (g)
[N2O5]2 / [O2]5*[N2]2
Place the following compounds in order from lowest to highest boiling point. The compounds are: hydrogen sulfide (H2S), methane (CH4), water (H2O). (5 points)
Lowest: CH4
H2S
Highest: H2O
How many mL of a 1.25 M solution of KNO3 are needed to make 37 mL of a 0.50 M solution?
14.8 mL
The Haber process is an industrial method for synthesizing ammonia from hydrogen gas and nitrogen gas, according to the reaction below. Using stoichiometry, calculate how many liters of hydrogen gas, measured at STP, is needed to produce 85.0 g of ammonia, NH3. 3H2 (g) + N2 (g) → 2 NH3 (g)
168 L
How much energy is needed to heat 5.6 g of ethanol from -15 °C to 35°C?
(c = 0.59 J/g*°C)
165 J
Given the following reaction, determine if the equilibrium will shift left, right, or remain unchanged as the different stresses are applied (1 point each = 3 points):
N2 + 3 H2 -> 2 NH3 + heat
Increase temperature
AdD H2
Add a catalyst
Increase temperature; LEFT
Add H2; RIGHT
Add a catalyst; NO CHANGE