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Chemical Reactions Notes

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Teika Clavell

on 30 September 2013

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Transcript of Chemical Reactions Notes

Chemical Reactions Notes
Physical Change
Although things that change often change physically, they are not all physical changes. A
physical change is a change that does not change the identity of a substance.
An exothermic reaction is a chemical reaction that produces heat.
An endothermic reaction is a chemical reaction that absorbs heat; gets cold.
What is Reactivity?
In the last video you saw an exothermic chemical reaction occured. It was the result of the reactivity of two compounds together that caused the reaction.
Reactivity is the tendency of a substance to undergo chemical changes.
The Catalyst
Much like a novel, the catalyst is the instigator of a reaction. In the case of stories, the catalyst can be a situation that instigates a confrontation. However, in science, a catalyst is always a substance; gas, liquid, or solid.
The catalyst is a substance that increases the rate of the chemical reaction.
Chemical Change
A chemical reaction is a process where elements and compounds combine to form new substances.
Chemical Reaction
Acids & Bases
Bases are substances with pH levels from 7-14. The higher the number, the more dangerous they are.
Acids are substances with a pH levels 0-7. The lower the number the more dangerous they are.
Battery Acid has a pH of 1.
Professional drain cleaner has a pH of 13.
a chemical change is irreversible & is caused by a chemical reaction.
A precipitate is a solid that is formed during a chemical reaction that takes place in a solution.
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