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Sci:chemical react
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| Question | Answer |
|---|---|
| Whats a chemical reaction? | When substances called reactants are transformed into new substances called products. |
| Whats a physical reaction and give an example. | A physical reaction is a reaction that is easily reversible and creates no new products or energy. E,g melting ice into water |
| Whats a chemical reaction and give an example. | A chemical reaction is a reaction that creates new substance or energy and hard to reverse. E.g lighting a candle. |
| What is the law of conservation? | When a chemical reaction occurs, the mass will always stay the same. |
| Whats activation energy? | The minimum energy needed for a reaction to occur, e.g lighting a candle. |
| Whats endothermic reaction? Give an example | When a reaction takes in energy e.g photosynthesis |
| Whats exothermic reaction? Give an example | When a reaction expels energy e.g burning matches |
| Whats a product | Something formed after a reaction |
| Whats rate of reaction | The speed a reaction occurs , the change in concentration per unit of time |
| Name 5 factors that can affect a reaction | Particle size, temperature,concentration , catalyst and reactants |
| Whats the formula to find rate of reaction | Amount of reactant used/ time taken |
| Whats a catalyst ? Give an example | A chemical that speeds up a reaction without using itself up e.g manganese dioxide |
Created by:
O15iny
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