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Description
Flashcards by Bronagh Tea, updated more than 1 year ago
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Created by Bronagh Tea
almost 9 years ago
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| Question | Answer |
| What does the rate of reaction depend on? | 1. The surface area or size of the particles 2. the concentration of the solutions 3. the temperature 4. the presence of catalyst |
| How do you calculate the rate of reaction from time? | rate (s-1) = 1 --------- time taken for metal to disappear |
| How can you tell when a reaction has finished? | Gas: reading the time when the mass/ gas volume first reaches optimum timing the reaction until you see the production of gas has stopped. Solid: time until no more can be seen |
| What is activation energy? | the minimum energy needed by colliding particles to react. |
| What happens to particles at higher temperatures? | 1. They have more energy and move faster 2. they collide more often 3. leads to more successful collisions 4. this increases the rate of reaction. |
| What happens to particles at higher concentration of solution? | 1. there are more present I the same volume 2. they collide more often 3. leads to more successful collisions 4. this increases the rate of reaction. |
| what happens when a catalyst is present at higher temperatures when all the other factors are kept the same? | 1. the gas volume starts at 0 2. The gas volume is higher every time 3. The line on the graph levels off earlier 4. but ends as the same final gas volume |
| what's the equation for a metal reacting with a dilute acid? | Mg+2HCL -> MGCL2 + H2 |
| what's the equation for a marble chips reacting with a dilute hydrochloric acid? | CaCO3 + 2HCL -> CaCL2 + H2O + CO2 |
| what's the equation for the catalyst decomposition of hydrogen peroxide? | 2H2O2 -> 2H2O + O2 |
| What is a catalyst? | A substance which speeds up the rate of reaction without being used up. It reduces the activation energy and creates more successful collisions. |
| How will the mass change? | It will stay the same as the catalyst is not used up |
| What is the catalyst for the decomposition of hydrogen peroxide? | Manganese (IV) oxide, MnO2 |
| What is the catalyst for the contact process (sulfuric acid manufacture)? | Vanadium (V) oxide, V2O5 |
| What is the catalyst for the Haber process (ammonia manufacture)? | Iron |
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