AnswersCR03101 ChemistryCumulative Exam

Cumulative Exam — Cumulative exam Answers

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A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How much energy is released by the reaction if the temperature of the calorimeter rises by 2.87°C?Use .

Question illustration
A
7.85 kJ
B
10.6 kJ
C
22.5 kJ
D
47.9 kJ
22
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Consider the unbalanced equation for the oxidation of aluminum._Al + _O2 _Al2O3Which sequence of coefficients should be placed in the blanks to balance this equation?

Question illustration
A
2, 3, 1
B
1, 3, 2
C
4, 3, 2
D
3, 2, 3
23

Which of the following best describes a pair of elements that will form an ionic bond?

A
C and H: Hydrogen easily loses electrons, and carbon gains them.
B
Li and O: Oxygen easily loses electrons, and lithium gains them.
C
P and Cl: Phosphorus easily loses electrons, and chlorine gains them.
D
Ca and Br: Calcium easily loses electrons, and bromine gains them.
24

Which diagram shows electrons violating the Pauli exclusion principle?

A
A box contains an up arrow.
Option A
B
A box contains an up and a down arrow.
Option B
C
A box contains an up and a down arrow.
Option C
D
A box contains an up and a down arrow.
Option D
25

Which is a feature of a single replacement reaction?

A
Substance XYZ breaks down into X and YZ.
B
Substance G reacts with compound XY to form GY and X.
C
Substance X burns rapidly in the presence of oxygen.
D
Substance QR and GT exchange ions with each other.
26

Which element is likely to have a high thermal conductivity?

A
antimony
B
carbon
C
chlorine
D
sodium
27

There are 6.022 1023 atoms of Hg in 1 mole of Hg. The number of atoms in 4.5 moles of Hg can be found by multiplying 4.5 by 6.022 1023. Which is the number of atoms in 4.5 moles of Hg, correctly written in scientific notation with the correct number of significant figures?

Question illustration
A
2.7 1024
Option A
B
27 1023
Option B
C
2.71 1024
Option C
D
27.099 1023
Option D
28

The mass of a sample of sodium bicarbonate is 2.1 kilograms (kg). There are 1,000 grams (g) in 1 kg, and 1 109 nanograms (ng) in 1 g. What is the mass of this sample in ng?

Question illustration
A
2.1 103 ng
Option A
B
2.1 106 ng
Option B
C
2.1 109 ng
Option C
D
2.1 1012 ng
Option D
29

Which statement best explains why different gases effuse at different rates?

A
At a given pressure, gas particles with smaller masses move faster.
B
At a given pressure, gas particles with smaller masses move slower.
C
At a given temperature, gas particles with smaller masses move faster.
D
At a given temperature, gas particles with smaller masses move slower.
30

Sodium chloride is made up of clear, colorless crystals. A solution of sodium chloride in water is a good conductor of electricity. Which statement describes sodium chloride?

A
It is made up of ions that are held together by ionic bonds.
B
It is made up of atoms that are held together by metallic bonds.
C
It is made up of atoms that are held together by covalent bonds with equal sharing of electrons.
D
It is made up of atoms that are held together by covalent bonds with unequal sharing of electrons.
31

A chemistry journal requires that all new research papers be peer reviewed by other scientists before they are published. This allows which of the following?

A
The reviewers can determine the experiment’s feasibility.
B
The reviewers can determine the experiment’s validity.
C
The reviewers can include their own findings with the research.
D
The reviewers can determine if they will help fund the research.
32

The boiling points of different substances are given in the table below.SubstanceBoiling point (°C)Acetic acid118.1Benzene80.2Chloroform61.2Water100.0Which substance most likely has the strongest intermolecular forces?

A
acetic acid
B
benzene
C
chloroform
D
water
33

Which element would most likely have chemical properties similar to that of fluorine (F)?

A
Ne
B
N
C
Li
D
Br
34

Which statement is true about crystal lattice energy?

A
It increases as the size of the ions increases.
B
It increases as the charge on the ions decreases.
C
It is the energy that ions absorb when they form a crystal.
D
It is a measure of the strength of the bonds between ions.
35

In an experiment, a student wants to increase the rate of a reaction that involves gases. Which change to the reactants would accomplish this?

A
Increase the volume to decrease pressure and to increase concentration.
B
Increase the volume to increase pressure and to decrease concentration.
C
Decrease the volume to decrease pressure and to increase concentration.
D
Decrease the volume to increase pressure and to increase concentration.
36

Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?

A
Energy is removed from the particles in each change, but more energy is removed in melting than in boiling because the attractions are weaker.
B
Energy is removed from the particles in each change, but more energy is removed in boiling than in melting because the attractions are weaker.
C
Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.
D
Energy is added to the particles in each change, but melting requires more energy than boiling because the attractions must be completely overcome.
37

Which is the formula mass of Na2SO4?

A
119.06 amu
B
125.98 amu
C
142.05 amu
D
174.12 amu
38

An atom bonds with another atom. What is the best classification for this reaction?

A
endothermic
B
chemical
C
nuclear
D
redox
39

Which compound contains both sigma and pi bonds?

A
HCCl3
B
H2CO
C
H2S
D
HBr
40

Based on the activity series provided, which reactants will form products?F > Cl > Br > I

A
CuI2 + Br2
Option A
B
Cl2 + AlF3
Option B
C
Br2 + NaCl
Option C
D
CuF2 + I2
Option D

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