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What type of classification best characterizes the following reaction?
2HBr (g) → H2 (g) + Br2 (g)
A) combination reaction
B) combustion reaction
C) decomposition reaction
D) single replacement reaction
E) none of the above
C) decomposition reaction.
MATCH
A) Boyle's Law
B) Charles' Law
C) Avogadro's Law
1. The volume of a gas is directly proportional to its temperature when pressure and the number of gas particles are constant.
Answer: B) Charles' Law
2. The volume of a gas is inversely proportional to its pressure when temperature and the number of gas particles are constant.
Answer: A) Boyle's Law
3. The volume of a gas is directly proportional to the number of moles of gas when pressure and temperature are constant.
Answer: C) Avogadro's Law
NaCl can be classified as a ________.
A) gas
B) liquid
C) weak electrolyte
D) strong electrolyte
E) nonelectrolyte
D) strong electrolyte
Write the three conditions that must occur for a chemical reaction to occur.
1. Must collide
2. Must be in the correct orientation
3. Must have enough energy
A gas mixture contains O2 and Ne. If O2 has a partial pressure of 766 torr and Ne has a partial pressure of 0.88 atm, what is the total pressure of this mixture in atm?
A) 767 atm
B) 563 atm
C) 1.00 atm
D) 1.48 atm
E) 1.89 atm
E) 1.89 atm
Which of the following is not a property predicted based on the Kinetic Molecular Theory?
A) It explains the low density of gases in comparison to solids and liquids.
B) It predicts a gasʹs tendency to assume the shape and volume of the container.
C) It explains why gases are compressible.
D) It predicts a gasʹs tendency to have high melting and boiling points.
E) It explains how the molecules slow down as temperature is decreased.
D) It predicts a gasʹs tendency to have high melting and boiling points.
Methanol, CH3OH, can be classified as a ________.
A) gas
B) solid
C) weak electrolyte
D) strong electrolyte
E) nonelectrolyte
E) nonelectrolyte
What are the three things that can speed up the rate of a reaction?
1. more reactants
2. higher temperature
3. Catalyst
What species will this make in water?
A) NaCl
B) CaO
C) CH3OH
D) N2O
Na+, Cl-
Ca2+, O2-
CH3OH
N2O
If the pressure of a constant amount of gas at constant temperature is increased by threefold, what happens to its volume?
A) The volume increases by six-fold.
B) The volume will not change.
C) The volume triples.
D) The volume increases by nine-fold.
E) The volume is one-third of the original volume.
E) The volume is one-third of the original volume.
The solubility of KI is 50 g in 100 g of H2O at 20 °C. If 110 grams of KI are added to 200 grams of H2O...
A) all of the KI will dissolve.
B) the solution will freeze.
C) the solution will start boiling.
D) a saturated solution will form.
E) the solution will be unsaturated.
D) a saturated solution will form.
When does a reaction reach equilibrium?
A. When the rate of the forward and backward reaction is the same.
B. When the concentration of forward and backward reaction is the same.
C. The limiting reactant is used up, and products are made.
D. Same concentration of products and reactants is observed.
A. When the rate of the forward and backward reaction is the same.
What volume (mL) of a 10.5 M solution of sodium hydroxide (NaOH) must be diluted to prepare a 200. mL solution of 1.75 M sodium hydroxide ?
A) 101 mL
B) 1200 mL
C) 33.3 mL
D) 56.9 mL
E) 0.0919 mL
C) 33.3 mL (M1V1=M2V2)
A quantity of Ne gas that was originally held at 3.80 atm pressure in a 1.00 L container at 26.0°C is transferred to a 10.0 L container at 20.0 °C. What is the pressure (in atm) of Ne in the new container ?
A) 0.372 atm
B) 3.80 atm
C) 1.35 atm
D) 0.292 atm
E) 5.56 atm
A) 0.372 atm
Which compound below becomes a strong electrolyte when dissolved in water?
A) C12H22O11 (sucrose)
B) SCl6
C) CH3CH2OH
D) KOH
E) Cl2
D) KOH
Explain why the rate of disappearance of NO and the rate of formation of N2 are not the same in the reaction:
2CO(g) + 2NO(g) → 2CO2 (g) + N2 (g).
Because of the 2:1 stoichiometric ratio between NO and N2, the NO must use 2 moles for each mole of N2 produced. This means that the rate of consumption of NO is twice as fast as the rate of production of N2.
According to the reaction given below, how many grams of solid Fe(OH)2 is formed when 175 mL of 2.27 M aqueous LiOH reacts with excess aqueous FeCl2?
(Note: Molar Mass of Fe(OH)2 is 89.859 g/mol)
FeCl2(aq) + 2 LiOH(aq) → Fe(OH)2(s) + 2 LiCl(aq)
A) 34.7 g
B) 35.7 g
C) 17.8 g
D) 51.0 g
E) 25.5 g
C) 17.8 g
A gas exerts a pressure of 685 mmHg and has a temperature of 245 K. What is the new pressure of this gas, in mmHg, if the temperature is increased to 655 K? Volume and the amount of the gas stay constant.
A) 933 mmHg
B) 556 mmHg
C) 256 mmHg
D) 1830 mmHg
E) 442 mmHg
D) 1830 mmHg
Which pair of compounds will form a solution?
A) Na2SO4 and benzene (C6H6)
B) H2O and CCl4
C) Benzene (C6H6) and hexane (C6H14)
D) NaCl and hexane (C6H14)
E) More than one of the combinations will form solutions.
C) Benzene (C₆H₆) and hexane (C₆H₁₄)
In the combustion of methane:
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)
Which reactant has the greatest rate of disappearance?
a. CH4
b. O2
c. CO2
d. H2O
e. CH4 and O2 have the same rate of disappearance.
B. O2