AnswersFL-2003350-Chemistry 1 HonorsLab: Calorimetry and Specific Heat

Lab: Calorimetry and Specific Heat — Unit test Answers

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21
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The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas particles?

A
The average kinetic energy decreases, and the particles stop colliding.
B
The average kinetic energy increases, and the particles stop colliding.
C
The average kinetic energy decreases, and the particles collide less frequently.
D
The average kinetic energy increases, and the particles collide more frequently.
22
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Manganese dioxide (MnO2(s), Hf = –520.0 kJ) reacts with aluminum to form aluminum oxide (AI2O3(s), Hf = –1699.8 kJ/mol) and manganese according to the equation below.What is the enthalpy of the reaction? Use .

Question illustration
A
–1,839.6 kJ
B
–1,179.8 kJ
C
1,179.8 kJ
D
1,839.6 kJ
23

An ice cube is placed on a kitchen counter. Which best describes heat flow in this situation?

A
Heat flows from the ice to the counter, causing the molecules in the counter to move more quickly.
B
Heat flows from the ice to the counter, causing the molecules in the counter to move more slowly.
C
Heat flows from the counter to the ice, causing the molecules in the counter to move more quickly.
D
Heat flows from the counter to the ice, causing the molecules in the counter to move more slowly.
24

What is thermal energy?

A
the average overall volume of a system
B
the total number of molecules in a system
C
the kinetic energy of particles in a system
D
the measure of temperature in a system
25

What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?Use .

Question illustration
A
0.00420 J/(gi°C)
B
0.00661 J/(gi°C)
C
238 J/(gi°C)
D
252 J/(gi°C)
26

Which graph represents an exothermic reaction?

A
A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line starts about halfway up the vertical axis and travels a short distance parallel to the horizontal axis; this segment is A plus B. The line then curves up sharply, peaks, and falls sharply to run parallel to and near the horizontal axis; the final segment is C. A double-headed arrow extends from A plus B to C.
Option A
B
A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line segment labeled A plus B starts low and runs parallel to the horizontal axis. The line then curves up sharply, peaks, and falls a short distance to run parallel to the horizontal axis; the final segment is labeled C. A double-headed arrow extends from A plus B to C.
Option B
C
A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line segment labeled A plus B starts halfway up the vertical axis and runs parallel to the horizontal axis for a short distance. The line then peaks and returns to the same level as A plus B and continues parallel to the horizontal axis; this segment is labeled C.
Option C
D
A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line segment labeled A plus B starts low on the vertical axis and runs parallel to the horizontal axis for a short distance. The line then rises sharply and levels off; this level section is labeled C. A double-headed arrow extends from the level of A plus B to that of C.
Option D
27

The Hrxn of formation of carbon dioxide is negative. Which statement is true?

Question illustration
A
The reaction is endothermic.
B
The reaction is exothermic.
C
The amount of carbon dioxide is more than the amount of reactants.
D
The amount of carbon dioxide is less than the amount of reactants.
28

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher’s head?

A
chemical
B
kinetic
C
nuclear
D
thermal
29

Which scenario would adhere to the law of conservation of energy?

A
Energy is created when water freezes.
B
Energy is destroyed when sugar is burned.
C
Energy stays inside molecules permanently.
D
Energy is transferred when atoms are rearranged.
30

Which is the best term to use when describing the energy of motion?

A
chemical
B
kinetic
C
potential
D
thermal
31

Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kJ of heat. The bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 J/(gi°C). If the initial temperature of the calorimeter is 25.5°C, what is its final temperature?Use .

Question illustration
A
30.9°C
B
34.5°C
C
44.0°C
D
51.5°C
32

Thermal energy is the energy associated with

A
electric fields.
B
being stored in chemical bonds.
C
the pull of gravity.
D
temperature.

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