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Midway Middle School.  Atoms are the building blocks of all matter.  Atoms are the smallest particle that cannot be broken down.  Atoms join with others.

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Presentation on theme: "Midway Middle School.  Atoms are the building blocks of all matter.  Atoms are the smallest particle that cannot be broken down.  Atoms join with others."— Presentation transcript:

1 Midway Middle School

2  Atoms are the building blocks of all matter.  Atoms are the smallest particle that cannot be broken down.  Atoms join with others atoms to make everything.

3  Chemical Reactions often cause observable changes

4  Color  Odor  Release or Absorption of Heat  Release or Absorption of Light  Release of Gas

5 Examples of Physical Changes *Melting ice *Dissolving salt *Cutting paper

6 *No new product is formed *Substance just physically appears different

7 Examples of Chemical Changes *Color change *Heat absorbed or released *Formation of gas

8 Hint: CHOPS Carbon Hydrogen Oxygen Phosphorus Nitrogen Sulfur

9 *Elements are made of only one kind of atom *Elements are all listed on the periodic table Examples of elements: Oxygen – O Iron – Fe Sodium - Na

10 *Compounds are made of two or more elements chemically combined Examples of compounds: Water – H 2 O Baking soda – NaHCO 3 Carbon dioxide – CO 2

11 NaHCO 3 This is the chemical formula for baking soda. *How many elements are there? 4 Sodium(Na) Hydrogen(H) Carbon(C) Oxygen(O )

12 NaHCO 3 This is the chemical formula for baking soda. *How many total atoms are there? Sodium(Na) 1 - Hydrogen(H) 1 - Carbon(C) 3 - Oxygen(O )

13  Matter can NOT be created Nor can it be destroyed  Chemical Equations MUST balance

14  The same number of atoms of each element must be in the products that were in the reactants of a chemical equation. Example: ReactantsProduct

15 Chemical reactions are represented on paper by chemical equations. Example: 2 hydrogen gas (2H 2 ) can react (burn) with oxygen gas (O 2 ) to form 2 water molecules(H 2 0).

16 yields subscript

17 Why do Chemical Equations have to balance?

18 Is this a balanced equation? Yes atoms in = atoms out

19 Balance the following equation:

20

21  We seem to be o.k. with our number of (C)carbon atoms in both the reactants and products  But, we have only half the (H)hydrogen in our products as in our reactants.

22 2

23 *This has balanced our (C)carbon and (H)hydrogen atoms *But, we now have 4 (O)oxygen atoms in our products, and only have 2 in our reactants.

24 2

25   We have a balanced chemical equation for the reaction of methane with oxygen.


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