AQA GCSE chapter 08 (part 1) rate of reaction
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| show | Hotter solution, More concentrated, Smaller bits, Catalyst (to merely say "heat" is not enough... read the question)
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| explain why a reaction goes faster when a solution is more concentrated | show 🗑
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| explain why a reaction goes faster when a solution is hotter | show 🗑
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| show | there is a larger surface area exposed, so more particles can react so there are more FREQUENT collisions (for the same period of time)
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| show | a chemical that speeds up the reaction without getting used up
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| show | it lowers the activation energy and provides an alternative pathway
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| what is the activation energy | show 🗑
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| show | Increasing surface area (honeycomb structure); high temperature
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| show | Carbon monoxide and Unburnt Hydrocarbons
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| An excess of Magnesium is reacted with a dilute solution of Acid. 40cm3 of Hydrogen is collected. The experiment is repeated at a hotter temperature. How much gas will be collected? More/less/same as (ie40cm3) | show 🗑
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| show | More than 40cm3; because there is more particles FOR THE SAME VOLUME in the concentrated acid so more gas particles will be collected
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| show | More concentrated=faster; As the reaction is faster, the line will be steeper (more volume collected for the same time)
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| A student plots volume of gas collected against time for a given reaction. He repeats the experiment at a hotter temperature. Would you expect the line at the start to be steeper/not as steep/same gradient? | show 🗑
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| A student plots volume of gas collected against time for a given reaction. He repeats the experiment at a hotter temperature. Would you expect the line at the end to be higher/lower or at the same height as the first experiment? | show 🗑
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| Predict what would happen to the rate of reaction if in the second experiment, you took double the volume of the same concentration, at the same temperature | show 🗑
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| A students places Marble chippings in acid and observe the volume of gas collected. DESCRIBE the shape of the graph (volume on y-axis and time on x-axis) | show 🗑
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| A students places Marble chippings in acid and observe the volume of gas collected. EXPLAIN the graph (volume on y-axis and time on x-axis) will level out and have an horizontal line at the end | show 🗑
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| show | rate=1/time
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| show | Draw the tangent to the curve; draw a LONG tangent; then work out the gradient of the tangent; the gradient is the rate
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| show | gradient=rise over run; take points that are as far as possible
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