AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Energy Answers

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Old photographic flashbulbs burn magnesium metal in a reaction that causes a flash of brilliant white light. A photographer would need to take care not to suffer burned fingers when trying to replace the hot bulb. What best identifies the energy transformation that occurs in the flashbulb?

A
chemical energy to electromagnetic energy and thermal energy
B
electromagnetic energy to chemical energy and thermal energy
C
chemical energy to electromagnetic energy
D
thermal energy to chemical energy
2
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Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?

A
thermal energy
B
potential energy
C
mechanical energy
D
electromagnetic energy
3

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.
4

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

A
chemical
B
kinetic
C
potential
D
electromagnetic
5

When an object falls toward the ground due to gravity, what type of energy becomes kinetic energy?

A
chemical
B
electromagnetic
C
potential
D
thermal
6

Which is the best example of potential energy?

A
holding a basketball in the air
B
rolling a ball across a flat table
C
flowing electric current through a wire
D
turning on a flashlight in a dark room
7

Thermal energy is the energy associated with

A
electric fields.
B
being stored in chemical bonds.
C
the pull of gravity.
D
temperature.
8

Chemical energy in burning wood is changed into thermal energy. The thermal energy is absorbed by water, which boils to produce steam. The thermal energy is changed into kinetic energy in the moving steam. The kinetic energy is used to turn a turbine, which converts the kinetic energy into electricity. Which sentence best describes this system?

A
It involves only energy transfer.
B
It involves only energy transformation.
C
It involves both energy transformation and energy transfer.
D
It does not involve either energy transformation or energy transfer.
9

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

A
chemical
B
kinetic
C
potential
D
thermal
10

An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?

A
The potential energy and kinetic energy remain the same.
B
The potential energy decreases as kinetic energy increases.
C
The kinetic energy decreases as potential energy increases.
D
The kinetic energy remains at zero, but potential energy increases.

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