1. STAAR Review DAY 3 MATTER AND ENERGY TEKS 8.5E (R), 8.5F (S)
© Hedgehog Learning

2. Chemical Changes CHEMICAL CHANGE
a change when a new substance is formed from the reaction between two or more different substances
© Hedgehog Learning

3. Physical Changes PHYSICAL CHANGE
a change in the temperature, state of matter, shape, density, or any other observable characteristic of a substance
© Hedgehog Learning

4. Law of Conservation of Mass
Mass of Reactants = Mass of Products
Before
After
How does the mass of the egg change before and after cooking? Do the physical and chemical changes affect the mass?
© Hedgehog Learning

5. Law of Conservation of Mass
Mass of Reactants = Mass of Products
Before
After
How does the mass of the egg change before and after cooking?
A: THE MASS REMAINS THE SAME
Do the physical and chemical changes affect the mass?
A: THE CHANGES DO NOT AFFECT THE MASS OF THE EGG
© Hedgehog Learning

6. Balancing of Chemical Equations
Law of Conservation of Mass in Chemical Reactions
H2 + O2  H2O
On a piece of paper, balance this reaction between hydrogen and oxygen gas.
© Hedgehog Learning

7. Balancing of Chemical Equations
Law of Conservation of Mass in Chemical Reactions
Was this your answer?
2H2 + O2  2H2O
4 atoms of Hydrogen on both sides
2 atoms of Oxygen on both sides
© Hedgehog Learning

8. © Hedgehog Learning

9. © Hedgehog Learning

10. © Hedgehog Learning

11. F E A B C H G D
© Hedgehog Learning