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Collision Theory
- 2. Chemical Reactions How do we know when a chemical reaction has occurred? If new substances are formed, then a chemical reaction has taken place. There are often signs that a chemical reaction is occurring. These include, light, heat, flames, smoke, gas production, a new smell, a colour change and the appearance of new substances.
- 3. Chemical Reactions Why do chemical reactions occur? Substances are made of billions of incredibly small particles, either atoms, ions or molecules. For substances to react, their particles must collide . For a collision to be successful, the particles must have sufficient energy, and they must be in right alignment.
- 4. Collisions
- 5. What factors affect the amount and the strength of collisions (reaction rate)? Surface Area Concentration Temperature Catalysts
- 6. Reaction Rate Surface area As we saw in our experiment, surface area greatly affects the _____ of the reaction. ________ the surface area increases the amount of atoms and molecules available for________, therefore increasing the rate of the _______.
- 7. Reaction Rate Concentration Read yellow part of page 75 and summarise how concentration affects the rate of reaction and why.
- 8. Reactions Rates Why is increasing the rate of a reaction often advantageous in industry? Brain storm in your book.