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States of Matter: Physical vs. Chemical Changes

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States of Matter: Physical vs. Chemical Changes

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Questions and Answers

When heat is added to a solid, what is the correct order of phases it will most likely transition through?

Solid, then Gas, then Liquid
Liquid, then Gas, then Solid
Gas, then Liquid, then Solid
Solid, then Liquid, then Gas (correct)

Condensation is the phase transition of a liquid turning to a gas.

False (B)

Explain, based on particle behavior, why thermal expansion occurs when heat is added to a solid.

Adding heat increases particle movement, causing them to push away from each other and increasing the overall volume of the solid.

The phase transition directly from solid to gas is called ______.

<p>sublimation</p> Signup and view all the answers

Match the state transition to the correct addition or removal of heat (please note that a state transition can only be listed once):

<p>Evaporation = Addition of Heat Freezing = Removal of Heat Sublimation = Addition of Heat Condensation = Removal of Heat</p> Signup and view all the answers

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Flashcards

Melting

The change of a solid to a liquid due to increased particle movement from added heat.

Evaporation

The process of a liquid changing to a gas.

Condensation

The change of a gas to a liquid.

Taking Away Heat

Particles slow down, increasing attraction, which can change the state of matter

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Changing State

Some substances, like water or chocolate, can change states (solid, liquid, gas), but burning something changes what it is.

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Study Notes

Adding Heat

Heat causes particles to move faster.
Particles start to make contact with each other, melting occurs (chain reaction).
Attraction weakens as particles move and push away from others.
Particles slip/move around each other.

Taking Away Heat

Removal of heat causes particles to slow down (next step).
Lack of movement allows attraction to increase.
Deposition and sublimation occur.
Thermal energy is removed.

Physical Changes

There is not a new substance.
Fats (oil, butter, blabber), moth balls (solid/gas), water (solid/liquid/gas), brain (solid/liquid/gas), gold (solid/liquid), nitrogen (gas), chocolate (solid/liquid), plastic (solid/gas), and lava (liquid/solid) can change state.

Chemical Changes

There is a new substance.
Nothing happens.
Table (ash, smoke), cardboard (ash, freak), grass, house, and bones cannot change their state.

Chocolate Bunny Melting Explanation

A chocolate bunny melts under the sun because it is made of chocolate, and chocolate will melt because it is too hot.

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Description

Explore the effects of adding or removing heat on matter. Learn about physical changes where substances change state (solid, liquid, gas) without becoming new substances. Discover chemical changes where new substances are formed, exemplified by materials that cannot change state.