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WorksheetsChemistry Exam Review #1
Total questions: 47
Worksheet time: 25mins
How many protons and electrons are in a 64Cu2+ ion?
27 protons, 29 electrons
27 protons, 31 electrons
29 protons, 27 electrons
29 protons, 31 electrons
What is the name of the compound with the chemical formula CrCl3?
chromium tetrachloride
chromium trichloride
chromium(II) chloride
chromium(III) chloride
If two oxygen atoms combine to make a molecule, what type of bond will they form?
an ionic bond
a hydrogen bond
a double covalent bond
a metallic bond
The half-life of phosphorous-32 is 14.3 days. How much of a sample of phosphorus-32 will remain after 57.2 days?
1/32
1/16
1/8
1/4
How does an S2- ion differ from an electrically neutral sulfur atom?
mass number
atomic number
nuclear charge
number of electrons
A gas under a pressure of 74 mmHg and at a temperature of 75°C occupies a 500.0-L container. How many moles of gas are in the container?
1.7 moles
7.9 moles
13 moles
59 moles
Which one of these compounds is soluble in water?
aluminum sulfide
calcium carbonate
iron(III) hydroxide
potassium sulfate
In which block does an element with the electron configuration [Xe]6s24f145d106p1 belong?
s block
p block
d block
f block
What is the volume of 2.00 moles of nitrogen gas (N2) at STP?
11.2 L
28.0 L
44.8 L
56.0 L
According to this balanced chemical equation, what volume of C2H2 is required to form 40.0 L of CO2?
2C2H2 (g) + 5O2 (g) → 2H2O (g) + 4CO2 (g)
20.0 L
44.8 L
80.0 L
100 L
A compound is 63.59% iron and 36.41% oxygen by mass. What is the empirical formula?
FeS
FeS2
Fe2S
Fe2S3
What do the ions K+, Ca2+, and Cl- have in common?
They have the same number of protons.
They will form covalent bonds with oxygen.
They have the same electron configuration as argon.
They are larger than their corresponding atoms.
This balanced equation represents a chemical reaction
2C4H10 (g) + 13O2 (g) → 8CO2 (g) + 10 H2O (g)
What type of chemical reaction is represented by the equation?
combustion
decomposition
double replacement
single replacement
This balanced equation represents a chemical reaction using palladium, Pd, as a catalyst.
CO2 (g) + H2O (l) → H2CO3 (l)
Without palladium the reaction is slow and produces low concentrations of product. How does the palladium increase the speed of the reaction?
The palladium reacts with the water.
The palladium lowers the activiation energy
The palladium purifies the carbon dioxide.
The palladium increases the reaction temperature.
Which pair of substances will likely undergo a single replacement reaction?
Na and BaCl2
Zn and BaCl2
Ca and BaCl2
K and BaCl2
Which statement is true for the reaction represented by this equation?
CH4 + 2O2 → CO2 + 2H2O
1 gram of CH4 is required to react with 2 grams of O2.
1 gram of CH4 is required to react with 4 grams of O2.
1 mole of CH4 is required to react with 2 moles of O2.
1 mole of CH4 is required to react with 4 moles of O2.
What is the percent by mass of N in Ca(CN)2?
15.21%
21.19%
30.42%
42.39%
A
B
C
D
This graph represents a heating curve of a substance. Which region on the graph represents the solid phase?
I
II
III
IV
A
B
C
D
This graph is a potential energy diagram for a chemical reaction. Which energy measure will remain unchanged with the addition of a catalyst?
II
IV
V
VI
What type of chemical reaction is represented by this balanced equation?
S8 (s) + 8O2 (g) → 8SO2 (g)
synthesis
decomposition
single replacement
double replacement
Which chemical equation is balanced?
LiOH + CO2 → Li2CO3 + H2O
2LiOH + CO2 → Li2CO3 + H2O
LiOH + 3CO2 → 2Li2CO3 + H2O
4LiOH + CO2 → Li2CO3 + 2H2O
Neutralization occurs when 15.0 mL of KOH react with 25.0 mL of HNO3. If the molarity of HNO3 is 0.750 M, what is the molarity of the KOH?
1.67 M
1.25 M
0.600 M
0.450 M
What is the molarity of 28.9 g of CaCl2 dissolved in water to make 0.78 L of solution?
0.33 M
0.69 M
1.5 M
3.0 M
What is the [H+] of an HCl solution of the pH is measured to be 6?
1x10-7 M
1x10-6 M
6x10-6 M
8x10-3 M
What is the correct chemical formula for sodium sulfate?
NaSO4
Na2SO4
Na(SO4)2
Na2(SO4)2
In a flexible container, 15.9 L of gas is under 589 kPa of pressure at a temperature of 56.5°C. If the pressure and temperature change to STP, what is the new volume?
10.2 L
76.6 L
92.4 L
112 L
What are the differences between these isotopes of hydrogen shown below?
1H, 2H, and 3H
the number of electrons and the atomic number
the number of protons and the atomic number
the number of neutrons and the mass number
the number of electrons and protons
What is the correct name for the acid whose chemical formula is H2SO4?
hydrosulfuric acid
hydrosulfurous acid
sulfurous acid
sulfuric acid
Which element is located in Group 2 (IIA) and Period 6 of the periodic table?
barium (Ba)
molybdenum (Mo)
radium (Ra)
tungsten (W)
How many moles are in 325 g of (NH4)2Cr2O7?
0.732 mole
0.776 mole
1.29 moles
1.37 moles
Which compound contains the greatest percent of oxygen by mass?
CO2
NO2
SO2
SiO2
This balanced equation represents a chemical reaction:
2KClO3 (s) → 2KCl (s) + 3O2 (g)
How many moles of KCl are produced when 4.25 moles of KClO3 decompose?
1.06 moles
2.13 moles
4.25 moles
8.50 moles
Considering this balanced chemical equation, how many grams of HgO will be produced when 44 g of Hg react with excess O2?
2Hg (l) + O2 (g)→ 2HgO (s)
28 g
44 g
48 g
96 g
What can be said of a closed system when an exothermic reaction proceeds in an aqueous solution?
There is a net energy loss.
There is a net energy gain.
Heat is transferred from the water to the reactants.
Heat is transferred from the reactants to the water.
In which group are the particles arranged in order of decreasing mass?
alpha, beta, neutron
alpha, neutron, beta
neutron, beta, alpha
neutron, alpha, beta
When combined, two gases have a pressure of 4.0 atm. If one gas has a pressure of 1.5 atm, what is the pressure of the second gas?
1.5 atm
2.0 atim
2.5 atm
5.5 atm
Which compound has the chemical formula MgI2?
di-iodide magnesium
iodide(II) magnesium
magnesium iodide
magnesium(I) iodine(II)
What is the best reason for using iron filings instead of an iron nail in a chemical reaction?
to decrease the amount of catalyst during the reaction
to increase the molecular structure during the reaction
to decrease the rate of the reaction
to increase the surface area of the reaction
Which is a characteristic of a strong acid?
It has a pH greater tha 7.
It completely ionizes in solution.
It contains many hydroxide ions.
It reacts only with a strong base.
To increase the temperature of 100.0 g of H2O (s) from -50.0°C to -10.0°C, how much energy is required?
1.67x104 J
8.20x103 J
8.08x103 J
1.95x103 J
A
B
C
D
This chart represents the melting point of several substances. What best explains the high melting point of the salt?
the strong electrostatic attraction between Na0 and Cl0
the weak electrostatic attraction between Na0 and Cl0
the weak electrostatic attraction between Na+ and Cl-
the strong electrostatic attraction between Na+ and Cl-
Using the solubility graph provided, a student performs an experiment to find the solubility of a substance. The student finds the amount of substance needed to make a saturated solution in 100 g of water at different temperatures. The student's data are shown in the table below the graph.
What is the identity of the substance?
sodium nitrate
potassium nitrate
sodium chloride
potassium chlorate
A
B
C
D
