Chemical Reactions - Denton Independent School District · EXIT TICKET: 3-2-1 Chemical Reactions...
Transcript of Chemical Reactions - Denton Independent School District · EXIT TICKET: 3-2-1 Chemical Reactions...
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Chemical Reactions
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Law of Conservation of Mass
Matter can not be
created or
destroyed, although
it may be
rearranged.
Lavoisier, 1788
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Chemical Reactions change that occurs when atoms
rearrange themselves
A process in which one or more substances are changed into others
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Chemical Reaction
•How do you know if a chemical reaction has occurred?
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Creation or loss
of heat
• Anytime two
chemicals are
combine resulting in a
temperature change,
that is evidence that
heat is being added or
lost from the products
and a chemical
reaction had occurred.
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Evidence of Chemical Reactions
•Temperature Change
•Heat is absorbed by the substances causing the temperature to decrease
•Heat is released by the substances causing the temperature to increase
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Production of a gas
(bubbles)
• When you mix chemical and see
bubbles or foaming, that is
evidence that a new gas has
formed
• This is a new substance which
means that a chemical reaction
must have occurred
• The only exception is when you boil
a liquid by adding heat
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Evidence of Chemical Reactions
•Fizzing
•When a gas is formed it may try to escape causing bubbles
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Evidence of Chemical Reactions
•Color Change
•This is evidence of a chemical reaction only when the other properties have also changed.
Chemical
Change
Not a
Chemical
Change
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Evidence of Chemical Reactions
•Precipitate Formed
•Precipitate is a solid substance formed when liquids are combined
•Example – Sour Milk Clumps
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Evidence of Chemical Reactions
•Light
•When a new substance is formed light energy can be produced.
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Other Signs That a Chemical Reaction has occurred •Fire
•Rotting
•Breaking down (decomposition)
•Cooking
•Rusting (oxidation)
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What chemical reactions have you experienced???
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EXIT TICKET: 3-2-1 Chemical Reactions
• 3: Types of evidence that proves that a chemical change has occurred
• 2: Examples of chemical reactions
• 1: Way that chemical reactions are different than physical changes.