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Chemical Reaction

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Cameron Dang

on 16 December 2015

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Transcript of Chemical Reaction

Chemical Reaction
What is a chemical reaction?
A chemical reaction
is when substances
under go a change

to become
new substances
are the starting substances, and...
are the new substances.
What characterizes a chemical reaction?
Here are some
that tells you that a
chemical reaction is occurring

1. A precipitate is formed

2. A gas is formed

3. Light is emitted

4. Change in color

5. Change in odor or taste

6. Change in temperature

7. Change in volume

8. Change in electrical conductivity

9. Change in melting or boiling point

10. Change in any distinctive chemical or physical property

What we are demonstrating:
Hot Ice
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The following contributors are listed in alphabetical order:

(Vinegar is diluted acetic acid)
("Baking Soda" is Sodium Bicarbonate)

... a solution of Sodium Acetate in Water
Cameron Dang
Brandon Chen
Kevin Gunawardana
Minjoon Kim
Andrew Wilt
this is the gas that will bubble up, leaving behind...
This is an example of a chemical reaction that we are going to discuss in detail later.
The different types of
chemical reactions
Combination or Synthesis Reaction
A + Bˆ->AB
Single Displacement or Substitution Reaction
A + BC -> AC + B
Decomposition or Analysis Reaction
AB -> A + B
Double Displacement Reaction
AB + CD -> AD + CB
Other types of Chemical Reactions:
Acid-Base Reaction
Oxidation-Reduction or Redox Reaction
Hydrolysis Reaction
We will combine a couple of household chemicals to make sodium acetate, also called "Hot Ice," according to the following chemical formula:
Why is Sodium Acetate
also called
Room temperature is actually below the freezing point of Sodium Acetate, but it remains in liquid form --
this is called "
supercooled liquid

When we sprinkle small pieces of sodium acetate crystals into the supercooled liquid, further
will quickly form around the existing crystals, and the liquid will turn into a solid; it appears whitish, and looks like "ice".

This is an
exothermic event
, and
is released.
Thus, the name "Hot Ice."

In fact, this is how hand warmers are made (the kind of warmer that one puts in ski gloves & boots).
Thank you for your attention
Full transcript