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

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

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

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

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

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

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

© Hedgehog Learning

© Hedgehog Learning

© Hedgehog Learning

F E A B C H G D © Hedgehog Learning