Energy Answers

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1
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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.
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

In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products?

A
kinetic energy
B
closed systems
C
law of conservation of energy
D
electromagnetic energy
4

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
5

A cyclist eats a full meal before going to ride a bike for 2 hours. Which energy transformation happens during this process?

A
Chemical energy turns into mechanical energy.
B
Kinetic energy turns into potential energy.
C
Thermal energy turns into electromagnetic energy.
D
Potential energy turns into chemical energy.
6

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

A
chemical
B
kinetic
C
potential
D
electromagnetic
7

According to the law of conservation of energy, what will most likely happen in a closed system?

A
Energy will be exchanged along with matter.
B
Energy will be exchanged, but matter will not be exchanged.
C
Energy will be created along with matter.
D
Energy will be destroyed, but matter will not be destroyed.
8

What type of energy is the sum of an object’s potential and kinetic energy?

A
mechanical energy
B
electromagnetic energy
C
chemical energy
D
thermal energy
9

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
10

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

A
chemical
B
kinetic
C
potential
D
thermal

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