1. Bell Ringer
When we balance equations, we only change _________, not subscripts.
T/F: Balanced chemical equations should have the same number of atoms on each side of the arrow.
Chemical equations are just abbreviations using chemical _______ and numbers.
In 2C6H2O5, how many atoms of Hydrogen are there?

2. ALCOS Objectives:
#1- Identify the steps of the scientific method
#4 State the law of conservation of matter (Balancing Chemical Equations)

3. Chapter 6 Section 3 Controlling Chemical Reactions

4. To start a chemical reaction you need activation energy.
Activation energy is the minimum amount of energy needed to start a chemical reaction.

6. Exothermic Reactions
Endothermic Reactions
P. 206 in textbook

7. Chemical reactions do not all occur at the same rate.
Explosions  really fast
Rusting  much slower

8. Rate of Reaction Rate of reaction tells us how fast a reaction occurs.
To find the rate of reaction, you can measure either how quickly the reactant is disappearing or how quickly the product is appearing.
Ex. If it takes 1 minute for 2 inches of the candle to burn, how many minutes will it take for 6 inches of the candle to burn.
Ans. 3

9. What affects the rate of reaction?
Concentration- the amount of substance present.
Surface area – how big or small the area is or how much is being exposed
Temperature – hot or cold

10. Inhibitor – slows down a chemical reaction. (ex: food preservatives)
Catalyst – speeds up a chemical reaction. (ex: enzymes)
Ex. Enzymes – breaks down food. Make it possible for your body to function properly.