WorksheetsReview Final Exam
Total questions: 60
Worksheet time: 3600secs
How many grams of titanium (Ti) are contained in 1.505 x 1023 atoms of titanium?
0.250 mole
12.0 g
7.21 x 1024 g
0.250 g
Given the following reaction: MgSO4 + 2NaOH → Mg(OH)2 + Na2SO4. How many grams of magnesium hydroxide are produced from 10.0 g each of magnesium sulfate and sodium hydroxide?
7.29 g
4.85 g
10.0 g
3.43 g
In chemistry, a "mole" of something is an amount that __________.
has a mass of 1 kilogram
is equal to 6.02 × 10 particles
fills a volume of 1 liter
D has a mass of 1 gram
To find the number of atoms in two moles of calcium, multiply the number of moles by
12.04 × 1023
8.02 × 1023
6.02 × 1023
2.06 × 1023
One mole of glucose is equal to 180 grams. How many molecules are in 180 grams of glucose?
6.02 × 1023
12.04 × 1023
30
180
Oxygen has an atomic number of 8 and an atomic mass of 16.00 grams. How many moles of oxygen are contained in 64.00 grams of oxygen?
2.00 moles
4.00 moles
8.00 moles
16.00 moles
How many molecules does a sample of an ideal gas contain if it is held in a 5.75 L container at 2.00 atm of pressure, and at a temperature of 25 °C?
2.8 × 1023 molecules
0.47 molecules
2.8 × 1021 molecules
3.4 × 1024 molecules
What volume does 3.0 mol of a gas occupy at 2 atm and 10 °C?
14.9 L
22.4 L
33.6 L
34.9 L
How many atoms are in a 4.67 g sample of silicon?
3.62 x 1024
1.00 x 1023
4.59 x 1021
2.81 x 1024
A chemist analyzes the amount of lead in a paint sample and finds that the sample contains 0.01 grams of lead. Which of the following is the most accurate determination of the number of lead atoms the sample contains?
6.02 × 1021 lead atoms
2.91 × 1019 lead atoms
1.28 × 1025 lead atoms
1.24 × 1026 lead atoms
What is the empirical formula of a compound that contains 80.0% C and 20.0% H?
C4H
CH4
C3H
CH3
The chemical formula for glucose is C6H12O6 . What is the percent mass of hydrogen in glucose? (atomic masses: C = 12.01, H = 1.00, and O = 15.99)
5.00%
33.30%
6.67%
53.30%
What is the empirical formula for a compound that has 57.5% Na, 40.0% O, and 2.5% H?
Na(OH)
Na(OH)2
Na2(OH)
Na2(OH)4
During a lab experiment, 48.62 grams of magnesium reacted with 32.00 grams of oxygen to produce magnesium oxide. What is the empirical formula for magnesium oxide? (atomic masses: Mg = 24.31 and O = 15.99)
MgO
Mg2O2
MgO2
Mg2O
Calculate the percent composition of ammonium nitrate, NH4NO3
21% N, 6% H, 73% O
22% N, 45% H, 33 % O
35% N, 5% H, 60 % O
35% N, 8% H, 57 % O
The following unbalanced equation shows how carbon dioxide reacts with hydrogen gas to form methane and water vapor.
CO2+ H2 → CH4 + 2H2O When the equation is balanced, the coefficient for H2 will be __________.
1
2
4
6
The following unbalanced equation shows how hydrogen and oxygen combine to form water. 2H2 + O2 → H2O When the equation is balanced, the coefficient for water (H2O) will be
0
1
2
4
KCl + O2 → KClO3 This chemical reaction represents the reaction of potassium chloride and oxygen gas to form potassium chlorate. When correctly balanced, the coefficient for oxygen will be __________.
1
3
5
6
C3H7OH + O2 → CO2 + H2O This chemical reaction represents the combustion of 1- propanol. When correctly balanced, the coefficient for oxygen gas is __________.
4
4.5
5
9
In a chemical reaction you begin with 18 atoms. When the reaction is over you would expect to have __________ atoms remaining.
less than 18
18
more than 18
There is not enough information to determine this.
Use the following equation to answer the question.
4Na + O2 → 2Na2O
Na has an atomic mass of 23.0g and O2 has an atomic mass of 16.0g. How many grams of Na are needed to completely react with 40.0g of O2 ?
10.0 g
23.0 g
92.0 g
115.0 g
A reaction is expected to yield 3.0 grams of a product. Upon completion of the reaction, it is found that only 2.4 grams of the product had formed. What is the percent yield of the product?
0.8%
2.4%
3.0%
80%
The ratio of the actual yield to the theoretical yield multiplied by 100% gives the _________ of a reaction.
expected yield
mole ratio
percent yield
experimental yield
If 6 moles of carbon dioxide are produced when 2 moles of propane are burned, how many moles of carbon dioxide are produced when 5 moles of propane are burned?
2.4
6
9
15
A 2 liter container holds 1 mole of a gas. The temperature of the gas is 300K. What is the pressure inside the container? Use 8.314 for the gas constant.
8.3 kPa
150.0 kPa
1247.1 kPa
2494.2 kPa
For a fixed amount of a gas, the relationship between pressure and temperature __________ when volume is held constant.
is directly proportional
is indirectly proportional
is inversely proportional
is not able to be determined
For a fixed amount of a gas, the relationship between pressure and volume __________ when the temperature is held constant.
is directly proportional
is indirectly proportional
is inversely proportional
is not able to be determined
For a fixed amount of a gas, the relationship between volume and temperature __________ when the pressure is held constant.
is directly proportional
is indirectly proportional
is inversely proportional
is not able to be determined
250 mL of a gas are stored at 600 torr. If the volume of gas is decreased to 200 mL while temperature remains constant, what is the new pressure of the gas?
83 torr
550 torr
650 torr
750 torr
The temperature of 300 mL of gas is increased from 300 K to 600 K while the pressure is held constant. What is the new volume of the gas?
150 mL
450 mL
600 mL
900 mL
Nitrogen and hydrogen react to produce ammonia.
N2+3H2 --> 2NH3
How many grams of hydrogen are needed to produce 15.0 mol of ammonia if the reaction goes to completion?
15.0 g
22.5 g
45.0 g
90.0 g
The diagram shows a chemical equation for the production of sodium chloride, NaCl. When 2.3 g of Na(s) reacts with excess , how many grams of NaCl will be produced?
2.3 g
4.6 g
6.9 g
5.9 g
Based on the kinetic theory of gases, __________ is proportional to __________.
absolute temperature, the average kinetic energy of molecules
pressure, volume
absolute pressure, the average kinetic energy of molecules
volume, absolute temperature
Which of the following is explained by the kinetic molecular theory?
repulsions between electron pairs
gases expand when heated
the movement of an electron
molecular mass
The structure of water allows it to dissolve many minerals. Which of these MOST accurately represents the structure of water?
Which of these is a property of water that allows it to transport materials through the Earth system?
It expands as it solidifies.
It is transparent.
It dissolves many substances.
It is a compound.
A student dissolves sodium chloride, NaCl, in distilled water. Which word BEST describes the water in this situation?
reactant
product
solute
solvent
Which of the following is an example of a solid solute in a liquid solvent?
air
antifreeze
salt water
soda pop
Based on general solubility rules, which of these compounds is likely to dissolve in water?
Ag2SO4
ZnCl2
Ag2SO4 and ZnCl2
No precipitate will form.
Haruko added 6.0 moles of NaCl, and then diluted the flask to 2.0 liters with water. What is the molarity (M) of this solution?
0.33 M
3.0 M
6.0 M
12.0 M
How many grams of NaOH would be required to make 250 mL of a 10.0 M solution?
25 g
40 g
100 g
160 g
Which of the following expresses solution concentration in terms of moles per liter?
molarity
molality
solubility
molar volume
The __________of a solution is the measure of how much of a given solute is dissolved in a given amount of solvent.
boiling point
solubility
concentration
percent composition
What is the volume of 10 moles of a 5M solution?
0.005 liter
0.5 liter
2 liters
50 liters
A student has a saturated solution of calcium acetate. Which of the following would be the most effective way to make this an unsaturated solution?
add some additional calcium acetate
evaporate some water from the solution
add a different compound with acetate ions such as sodi um acetate
add some water to the solution
Which substance, when mixed with water, will produce the BEST conductor of electricity?
table salt
granulated sugar
carbon dioxide
motor oil
C6H12O6 (aq)
CH3COOH(aq)
NaCl(aq)
H2O(aq)
When adding sugar to tea, it was observed that the sugar kept dissolving. When ice was added, some sugar precipitated to the bottom of the glass. The mixture is then considered to be
unsaturated.
saturated.
supersaturated.
at equilibrium.
A solute will dissolve more quickly into a solution if you
decrease the temperature.
increase the temperature.
increase the volume of solute.
decrease the volume of solvent.
A
Both A and C have equal dissolving rates.
C
Both B and C have equal dissolving rates.
A
B
C
D
Substance A is classified as an acid because of the fact that it donates a proton and becomes dissociated after this donation. Which definition of an acid was most likely used to classify Substance A as an acid?
Arrhenius
Brønsted-Lowry
Lewis
Not enough information
In regards to acids and bases, strong and weak refer to extent of __________.
dissociation
deletion
retention
dismantle
Milk is slightly acidic with a pH of approximately 6.7, so according to the scale it would have a pH closest to __________.
a lemon
a tomato
water
soap
According to the scale, which of the following substances is a base?
lemon
tomato
water
soap
Which of the following is formed when a base containing hydroxide ions reacts with an acid?
hydrochloric acid
hydrogen ions
water and salt
sulfuric acid
A solution has a hydrogen-ion concentration of 4.3 moles per liter. Which of the following equations would allow you to find the pH of the solution?
pH = log (4.3)
pH = -log (4.3)
pH = log ( 1 / 4.3)
pH = -log ( 1 / 4.3)
A strong acid will __________ into ions when placed in water.
not dissolve
partially dissolve
completely dissolve
sometimes dissolve
A scientist determines that a dilute acid contains approximately moles/L of hydronium ions. A concentrated acid is measured as having a hydronium ion concentration of moles/L. As compared with the dilute acid, the concentration of hydronium ions in the concentrated acid is
3 times greater.
4 times greater
10,000 times greater.
1,000,000 times greater
