Do Now Watch the following video and write down: 3 physical changes 3 chemical changes

Physical and Chemical Changes

Physical Changes A change that occurs when a substance changes its appearance but does not change its chemical composition 3

Chemical changes or chemical reactions Chemical changes produce new chemicals with new properties. 4

What are signs that a chemical change has occurred? bubbles forming temperature change color change light production Smoke Gives off heat A chemical change occurs when fireworks are burned. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

Changing states of matter Endothermic reaction: A reaction accompanied by or requiring the absorption of heat FEELS COLD

Changing states of matter Exothermic reaction – a reaction accompanied by the release of heat FEELS HOT

___ melting ___ cutting hair ___ water evaporating ___ dissolving ___ fruit spoiling ___ painting a picture ___ burning ___ separating water into oxygen and hydrogen P P P P C P C C

How could eating an apple and your body digesting it be classified as both a chemical change and a physical change?

What is it?

Is it a chemical or physical change? Sugar dissolving in tea Breaking water up by separating it into hydrogen and oxygen

Is it a chemical or physical change? Cutting paper Burning a paper Crushing an aspirin

Is it a chemical or physical change? Metal rusting An egg rotting A fried egg

Is it a chemical or physical change? Lighter fluid burning

Which is it? element, compound or mixture