NGSS.MS-PS1-4

The following changes (melting wax, evaporating gasoline, freezing water) are all examples of

• nuclear changes.
• chemical changes.
• physical changes.
• a.  energy consumption.

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NGSS.MS-PS1-4

Before: molecules move around each other, After: molecules move in place

• Before, the substance was a solid and later a liquid.
• Before,the substance was a gas, and later a liquid.
• Before, the substance was a liquid and later a solid.
• Before,the substance was a liquid, and later a gas.

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NGSS.MS-PS1-4

In ENDOTHERMIC reactions, energy is _____ by the reaction system from the surroundings.

• Absorbed

• Released

• Eliminated

• Obliterated

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NGSS.MS-PS1-4

How does heat affect the thermal energy of an object that is colder than the air that surrounds it?

• Heat decreases the thermal energy of an object as energy moves to the air.

• Heat causes the thermal energy of the object to increase as energy moves from the warmer air to the colder object.

• Heat has no effect on thermal energy, but it increases the potential energy of an object.

• Heat is not related to thermal energy, so it cannot affect the thermal energy of an object.

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NGSS.MS-PS1-4

How does heat affect the thermal energy of an object that is colder than the air that surrounds it?

• Heat decreases the thermal energy of an object as energy moves to the air.

• Heat causes the thermal energy of the object to increase as energy moves from the warmer air to the colder object.

• Heat has no effect on thermal energy, but it increases the potential energy of an object.

• Heat is not related to thermal energy, so it cannot affect the thermal energy of an object.

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NGSS.MS-PS1-4

How does removing heat change the particles in a closed system?

• Particles move apart

• Particles slow down and break apart

• Particles move faster and potentially change phases

• Particles move slower and potentially change phases

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NGSS.MS-PS1-4

As you touch a hot stove the heat transfers -

• from your hand to the stove
• from the stove to your hand
• It doesn't transfer

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NGSS.MS-PS1-4

How can you stop the movement of particles?

• Increase the temperature

• Decrease the temperature

• You can't.

• Hold them still with your hands.

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NGSS.MS-PS1-4

Particles move relative to each other, but remain in contact with each other.

• solid

• liquid

• gas

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NGSS.MS-PS1-4

All changes in states of matter (boiling, melting, evaporation) are

• chemical changes

• physical changes

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NGSS.MS-PS1-4