VIEWS: 6 PAGES: 11 POSTED ON: 8/22/2011
Bell Ringer 4-29-09 1. When we balance equations, we only change _________, not subscripts. 2. T/F: Balanced chemical equations should have the same number of atoms on each side of the arrow. 3. Chemical equations are just abbreviations using chemical _______ and numbers. 4. In 2C6H2O5, how many atoms of Hydrogen are there? ALCOS Objectives: #1- Identify the steps of the scientific method #4 State the law of conservation of matter (Balancing Chemical Equations) Chapter 6 Section 3 Controlling Chemical Reactions To start a chemical reaction you need activation energy. Activation energy is the minimum amount of energy needed to start a chemical reaction. Exothermic Reactions Endothermic Reactions P. 206 in textbook Chemical reactions do not all occur at the same rate. Explosions really fast Rusting much slower 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 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 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.
Pages to are hidden for
"Chapter 6 Section 3 Controlling Chemical Reactions"Please download to view full document