3.2 - Changes in Matter.

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Presentation transcript:

3.2 - Changes in Matter

There are two types of changes matter can undergo PHYSICAL CHANGE CHEMICAL CHANGE What is it? no new substance formed is a change in the phase of a substance What is it? new substance with new properties are formed

There are two types of changes matter can undergo PHYSICAL CHANGE CHEMICAL CHANGE What is it? no new substance formed is a change in the phase of a substance How it occurs: Intermolecular bonds are broken the distance between molecules changes What is it? new substance with new properties are formed How it occurs: Intramolecular bonds (chemical bonds) are broken bonds are broken and formed

There are two types of changes matter can undergo PHYSICAL CHANGE CHEMICAL CHANGE How do you know if a change is chemical: new colour new smell heat/light might be given off bubbles or gas formed solid material forms in liquid (precipitate) difficult to reverse (undo) How do you know if a change is physical: no new colour no new smell change in shape reversible

CHEMICAL CHANGE

Liquid Solid Liquid CHEMICAL CHANGE

PHYSICAL CHANGE

There are two types of changes matter can undergo PHYSICAL CHANGE CHEMICAL CHANGE Examples: mixing dissolving phase change Examples burning explosions stove top cooking

gas solid liquid Types of phase changes condensation sublimation deposition evaporation/ vaporization melting solid liquid freezing/solidification

Types of energy changes Exothermic: releases heat (KABOOM!!) Endothermic: absorbs heat HEAT

Practice P. 61 #59

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