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Chemical Reactions

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on 20 October 2013

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Transcript of Chemical Reactions

"Chemical Reactions"
by: Christina Reyna

Topic 3
Examples of chemical changes.
What are Physical changes?

A physical change is when you change something and you are able to change it back to its original form. for example Water can
be turned into ice by freezing it but when you melt it, it turn back
to water.
What is the Law of Conservation of Mass?
The law of conservation of mass states that matter cannot be created or destroyed, although it can be rearranged.
Who is Antoine Lavoisier?
Antoine Lavoisier was a french noblemen and chemist. He was considered "Father of Modern Chemistry."

What did he contribute?
He discovered the Law of Conservation of Mass and discovered combustion involved oxygen not phlogiston.

What are chemical changes?
A chemical change is when something gets turned into a whole new substance.
Examples of physical change:
How do you know a chemical reaction has taken place?
You know a chemical change has happened if you are not able to change it back to its original form. For example if you have a car and it gets rusty you wont be able to get that rust off so that is an chemical change.
Lights out
In the lights out lab we got baking soda and vinegar and mixed the two.
we lit a candle and we held the mixture of baking soda and vinegar close to the fire and the fire went out.The fire went out because the baking soda and vinegar made carbon dioxide and the carbon dioxide sucked the oxygen out the fire and you need oxygen to have a fire.
Color change
In the color change lab we got red cabbage and put it in a bag. We added water to the bag and started smashing the cabbage and the color got in the water. The chemical change is that you cant change the water back.
In the balloon lab we got vinegar in a beaker and got a balloon and put baking soda in it. Then we put the balloon on top of the beaker without letting any baking soda out. Then we let go of the balloon and the baking soda blew up the balloon. It weighed lighter because some of the carbon dioxide went through the balloon.
Balloon Lab
melted sugar
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