Background: Thermal Energy and Kinetic-Molecular Theory

Thermal energy is the sum of the kinetic and potential energy of ________ in an object.

• particles

• waves

• molecules

• atoms

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What is kinetic energy?

• Stored energy

• Energy in motion

• Energy lost as heat

• Energy in a vacuum

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What is potential energy?

• Energy in motion

• Energy lost as heat

• Stored energy

• Energy in a vacuum

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Kinetic-molecular theory helps us to understand ________ of matter and thus their behaviors and properties.

• states

• colors

• weights

• origins

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According to the Kinetic-Molecular Theory, all matter is made of small _________.

• particles

• waves

• liquids

• cells

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According to the Kinetic-Molecular Theory, those particles are in ________ random motion.

• constant

• slow

• erratic

• occasional

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What does the constant random motion of particles cause them to do?

• It causes the particles to collide with each other and the container that they are in.

• It causes the particles to stop moving completely.

• It causes the particles to form a solid structure instantly.

• It causes the particles to lose all their energy.

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What is transferred between particles when they collide according to the Kinetic-Molecular Theory?

• Kinetic energy (KE)

• Potential energy (PE)

• Mass

• Electric charge

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What is the measure of the average kinetic energy of particles in an object called?

• Temperature

• Pressure

• Density

• Volume

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The higher the temperature, the higher the kinetic energy, and the greater the motion of the particles.

• True

• False

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