Science: Rates of Reaction
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Last updated 1:06 AM on 8/18/26
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116 Terms
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What is a chemical reaction?
A process where substances react and form new substances.
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What are reactants?
The substances you start with in a chemical reaction.
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A: A process where substances react and form new substances.
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Q: What are reactants?
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A: The substances you start with in a chemical reaction.
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Q: What are products?
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A: The new substances formed at the end of a chemical reaction.
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Q: What is the fastest type of reaction from the examples in the test?
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A: Combustion, such as petrol burning in a car engine.
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Q: What is an exothermic reaction?
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A: A reaction that causes a temperature increase and releases heat.
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Q: What is an endothermic reaction?
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A: A reaction that causes a temperature decrease and absorbs heat.
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Q: What happens to the surface area when a solid is crushed into smaller pieces?
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A: The surface area increases.
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Q: What are the four main ways to speed up a chemical reaction?
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A: Heating, increasing concentration, increasing surface area and using a catalyst.
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Q: How does heating speed up a reaction?
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A: Heating is one of the four methods used to speed up chemical reactions.
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Q: How can concentration speed up a reaction?
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A: Using a higher concentration of reactants speeds up the reaction.
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Q: How can surface area speed up a reaction?
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A: Breaking a solid into smaller pieces exposes more surface area, speeding up the reaction.
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Q: What is a catalyst?
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A: A substance that speeds up a chemical reaction.
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Q: What method speeds up the manufacture of margarine using nickel?
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A: Catalyst.
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Q: Why does magnesium powder react faster than magnesium strips?
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A: It has a greater surface area.
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Q: What method is used when a heater helps brew beer faster?
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A: Heating.
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Q: Why does undiluted bleach work faster than bleach mixed with water?
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A: It has a higher concentration.
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Q: What happens to the reaction if the liver test tube is put in the fridge instead of kept at room temperature?
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A: Less oxygen is produced in the same time because the reaction is slower.
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Q: What happens if more pieces of liver are added?
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A: More oxygen is expected to be produced.
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Q: What happens if more hydrogen peroxide is added?
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A: More oxygen is expected to be produced.
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Q: What happens if the liver is ground up?
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A: More oxygen is produced because grinding increases the surface area.
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Q: In the liver reaction, what are the reactant and products?
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A: Reactant: hydrogen peroxide. Products: water and oxygen.
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