Midway Middle School. Atoms are the building blocks of all matter. Atoms are the smallest particle...
25
Chemical Reactions Midway Middle School
-
Upload
paloma-lighthall -
Category
Documents
-
view
220 -
download
0
Transcript of Midway Middle School. Atoms are the building blocks of all matter. Atoms are the smallest particle...
- Slide 1
- Midway Middle School
- Slide 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.
- Slide 3
- Chemical Reactions often cause observable changes
- Slide 4
- Color Odor Release or Absorption of Heat Release or Absorption of Light Release of Gas
- Slide 5
- Examples of Physical Changes *Melting ice *Dissolving salt *Cutting paper
- Slide 6
- *No new product is formed *Substance just physically appears different
- Slide 7
- Examples of Chemical Changes *Color change *Heat absorbed or released *Formation of gas
- Slide 8
- Hint: CHOPS Carbon Hydrogen Oxygen Phosphorus Nitrogen Sulfur
- Slide 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
- Slide 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
- Slide 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 )
- Slide 12
- NaHCO 3 This is the chemical formula for baking soda. *How many total atoms are there? 6 1 - Sodium(Na) 1 - Hydrogen(H) 1 - Carbon(C) 3 - Oxygen(O )
- Slide 13
- Matter can NOT be created Nor can it be destroyed Chemical Equations MUST balance
- Slide 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
- Slide 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).
- Slide 16
- yields subscript
- Slide 17
- Why do Chemical Equations have to balance?
- Slide 18
- Is this a balanced equation? Yes atoms in = atoms out
- Slide 19
- Balance the following equation:
- Slide 20
- Slide 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.
- Slide 22
- 2
- Slide 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.
- Slide 24
- 2
- Slide 25
- We have a balanced chemical equation for the reaction of methane with oxygen.