Download presentation
Presentation is loading. Please wait.
Published byDeborah Phillips Modified over 8 years ago
2
The minimum amount of energy needed to start a chemical reaction All chemical reactions require a certain amount of activation energy to get started Activation Energy
3
4
Factors that affect rates of reaction include: Surface area Temperature Concentration Presence of catalysts and inhibitors Rates of Chemical Reactions
5
When a chunk of solid substance reacts with liquid or gas, only the particles on the surface of the solid come in contact with the other reactant If you break the solid into smaller pieces, more particles are exposed and the reaction happens faster When can this be useful? Chewing your food breaks it into smaller pieces that your body can digest more easily and quickly! Surface Area
6
7
Increase the temperature=increase rate of reaction When you heat a substance, its particles move faster Come in contact more often Faster-moving particles have more energy. Therefore, causes more particles of the reactant to get over the activation energy hill Temperature
8
The amount of a substance in a given volume Adding a small spoonful of sugar to lemonade will make it sweet but adding a large spoonful of sugar will make it sweeter Supplies more particles to react Concentration
9
10
Material that increase the rate of a reaction by lowering the activation energy Not considered reactants because catalysts are not permanently changed Enzymes=biological catalysts Enzymes provide a surface for the reaction to take place By bringing the reactant molecules close together, it lowers the activation needed to get the reaction started Catalysts
11
Enzymes
12
Sometimes a reaction is more useful when it can be slowed down rather than sped up Inhibitors are used to decrease the rate of reaction Prevent reactants from coming together Preservatives added to food act as inhibitors to prevent food products from spoiling or becoming stale Inhibitors
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.