WorksheetsChemistry Spring Final Review
Total questions: 57
Worksheet time: 50mins
Balance the following reaction:
KClO3 -> KCl + O2.
What is the coefficient for the oxygen gas?
1
2
3
4
Molarity is defined as moles/Liter. What is the molarity of a solution where 73 grams of hydrochloric acid, HCl, is dissolved in enough water to make exactly 2.0L of solution?
0.047 M
1.0 M
4.1 M
36.5 M
Which of the following processes will absorb energy?
gas to liquid
solid to liquid
gas to solid
gas to gas
A student needs to prepare 3.0L of a 2.0M HCl solution for a lab. What volume of the stock 12M HCl solution should she measure out?
41 mL
2.64 L
60 mL
0.50 L
What are the missing coefficients for the unbalanced equation: Al₂(SO₄)₃ + KOH → Al(OH)₃ + K₂SO₄
1,3,2,3
2,12,4,6
4,6,2,3
1,6,2,3
The specific heat constant is about 4J/g°C. Use the heat formula, q = m x C x ΔT, to calculate how much energy is required to heat 200g of water from 25°C to 75°C.
20,000J
40,000J
60,000J
5,000J
Separating aluminum from its ore was once a costly refining process. If 510 grams of aluminum ore (Al₂O₃) are refined according to the equation below, how many grams of aluminum metal can be produced?
____Al2O3 --> _____Al + ____O2
108g
102g
510g
270g
Which of the following will cause a solid solute to dissolve faster?
Increase the temperature
Grind up the solute
Stir the solution
All of these
Calcium hydroxide can be used to neutralize a solution of hydrochloric acid. If 6.0 moles of Ca(OH)₂ are combined with 8.0 moles of HCl, how many moles of CaCl₂ could be produced?
1.0 moles
6.0 moles
4.0 moles
8.0 moles
The heat of fusion for water is 334J/g. If 72g of ice is melted, how much energy will it absorb?
6.0 kJ
12 kJ
24 kJ
432 kJ
Acids are solutions that have more ______ than pure water and bases are solutions that have more ______ than pure water.
N+, OH-
OH-, H+
H+, OH-
none of these
A reaction bin contains 3.92 x 10^52 molecules of dinitrogen pentoxide. If it decomposes into nitrogen dioxide and oxygen gas, how many grams of oxygen gas are produced?
6.25 x 10^30 g
3.13 x 10^30 g
2.78 x 10^30 g
6.02 x 10^23 g
If 4.04g of N combine with 11.46g O to produce a compound with a molar mass of 108.0 g/mol, what is the molecular formula of this compound?
N2O5
NO
N4O10
NO2
You have 109 grams of copper. How many atoms of copper do you have?
1.03 x 10^24 atoms
1.72 x 10^22 atoms
2.78 x 10^24 atoms
2.50 x 10^22 atoms
How many oxygen molecules are in .48 L of oxygen gas at STP?
2.89 x10^23 molecules
6.47 x 10^24 molecules
1.29 x 10^22 molecules
1.81 x 10^22 molecules
The graph below shows the phase change of water. Use the graph to answer this question: Segment where water is completely in the gaseous phase.
AB
BC
CD
DE
EF
The graph below shows the phase change of water. Use the graph to answer this question: Segment where the temperature of water is changing.
AB & BC
BC & CD
AB & CD
BC & DE
DE
What type of solution is formed when 30 g of K₂Cr₂O₇ is dissolved in 100 mL of water at 60°C?
a. saturated
b. unsaturated
c. supersaturated
d. subsaturated
Which solute is least affected by temperature?
a. CaCl₂
b. KNO₃
c. NaCl
d. Ce₂(SO₄)₃
Which solute is most soluble in 100 mL of water at 70°C?
a. Ce₂(SO₄)₃
b. KClO₃
c. NaCl
d. KCl
The solvent in a solution has absorbed as much solute as possible at room temp. The resulting solution is considered....
a. saturated
b. unsaturated
c. supersaturated
d. covalent
The correct formula for hydrobromic acid is __________.
HBr
H2Cl
HBrO3
H2Br
The correct formula for “hypochlorous acid” is....
a. HCl
b. HClO₃
c. HClO₂
d. HClO
In the reaction 2Al2O3 → 4Al + 3O2, what is the mole ratio of aluminum to oxygen gas?
10:6
3:4
2:3
4:3
When two substances react to form products, the reactant which is used up is called the ___.
determining reagent
limiting reagent
excess reagent
catalytic reagent
A solution has a molarity of 5.2M CaCl2. If the volume of the solution is 3.3 liters, how many grams of solute are in the solution?
17.16 g CaCl2
1.58 g CaCl2
110.98 g CaCl2
1903 g CaCl2
There are 5.7 L of a 2.44 M solution of potassium hydroxide. If 1.8 L of solvent is added to the original stock solution, what is the new molarity?
7.73 M
4.20 M
0.77 M
12.1 M
Which is the correct molar mass for the compound FeSO4?
103.85 g/mol
151.92 g/mol
415.4 g/mol
247.85 g/mol
Which is the percent composition of bromine in the compound NaBr?
81.6%
79.9%
84.1%
77.7%
Which of the following is an example of an exothermic process?
Melting
Boiling
Freezing
Sublimation
What does molality measure?
mol solute / L solution
mol solute / kg solvent
L solution / mol solute
kg solvent / mol solute
What is the pH range for acids?
pH < 7
pH > 7
pH = 7
pH = 14
What is the characteristic taste of bases?
Sour
Bitter
Sweet
Salty
What is the pH range for bases?
pH < 7
pH > 7
pH = 7
pH = 14
What is the definition of molarity?
mol solute / kg solvent
mol solute / L solution
L solution / mol solute
kg solvent / mol solute
What is the characteristic taste of acids?
Sour
Bitter
Sweet
Salty
What is the definition of colligative properties?
Depend on the identity of particles
Depend on the number of particles
Depend on the mass of particles
Depend on the volume of particles
In an endothermic reaction, how does the energy of the products compare to the reactants?
Products have more energy than reactants.
Products have less energy than reactants.
Products have the same energy as reactants.
Energy is not involved in the reaction.
In an exothermic reaction, how does the energy of the products compare to the reactants?
Products have less energy than reactants.
Products have more energy than reactants.
Products have the same energy as reactants.
Energy is not involved in the reaction.
What is the molecular formula for a compound with an empirical formula of N₂O₅ and a molar mass of 108 g/mol?
N₂O₅
NO₂
N₂O₄
NO
How many particles are in 0.347 mol of a substance?
0.347 × 6.022 × 10²³
0.347 × 3.022 × 10²³
0.347 × 6.022 × 10²²
0.347 × 3.022 × 10²²
What is the significance of activation energy in a chemical reaction?
It is the energy required to start a reaction.
It is the energy released during a reaction.
It is the energy absorbed during a reaction.
It is the energy that remains constant during a reaction.
Which type of reaction involves products having less energy than reactants?
Exothermic
Endothermic
Isothermal
Adiabatic
A student measures the pressure and volume of an empty water bottle to be 1.4 atm and 2.3 L. She then decreases the pressure to 0.65 atm. What is the new volume?
2.1 L
5.0 L
8.2 L
3.9 L
Consider a sample of oxygen gas at 27.0° C with a volume of 9.55L at a pressure if 2.97 atm. The pressure is changed to 8.25 atm and the gas is heated to 125° C. What is the new volume?
4.56 L
4.6 L
15.9 L
16 L
A weather balloon has a volume of 105L at 0.970 atm when the temperature is 318K. What is the volume at 293K and 1.05 atm?
89.4 L
0.32 L
93.8 L
3.13 L
A sample of nitrogen gas has a volume of 600mL at a pressure of 1 atm. What volume will the gas occupy at a pressure of 3 atm, assuming the temperature remains constant?
125mL
300mL
200mL
400mL
If a gas at 25.0°C occupies 3.60 liters at a pressure of 1.00 atm, what will be its volume at a pressure of 2.50 atm?
1.5L
45 L
1.44L
27.4L
A student inflates a balloon with helium then places it in the freezer. The student should expect
the balloon's volume to increase
the balloon's volume to decrease
the balloon's moles to increase
the balloon's moles to decrease
When the temperature of matter increases, the particles...
speed up and move closer
speed up and move farther apart
slow down and move closer together
slow down and move farther apart
All molecules at the same temperature have the same average kinetic energy.
True
False
A sample of gas is in a flexible container at room temperature. What happens to the pressure as volume increases?
pressure stays the same
pressure decreases
pressure increases
What is the pressure exerted by 5.00 moles of nitrogen gas contained in a 30.0 Liter container at 25.0 °C?
3670 atm
0.245 atm
4.08 atm
605 atm
Determine the temperature required for 0.0470 moles of gas to fill a balloon to 1.20 L under 0.998 atm pressure.
0 K
107 K
207 K
307 K
Each of the flasks shown above contain the same number of gas molecules. In which flask would the pressure be lowest?
Flask 1
Flask 2
Flask 3
Flask 4
