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Published byEmil Rich Modified over 8 years ago
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Increasing the concentration of a reactant substance will increase the rate of reaction. This is because more collisions will occur, and therefore more successful collisions.
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Eg – we used HCl of 2M the other day and it would cause a faster reaction than 1M because it has a higher concentration.
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If surface area is increased – more particles are exposed for collisions to occur.
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If surface area is increased – more particles are exposed for collisions to occur. The rate of reaction will increase as there are more collisions, therefore more successful collisions.
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EG – Calcium carbonate powder reacted much faster in HCl than Calcium carbonate chips. This is because the powder has a larger surface area.
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When temperature increases, particles move faster and collide more often.
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The particles also have more energy to collide with = more products.
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A catalyst is a chemical or substance that is added to a reaction to speed it up.
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The catalyst does not change the products formed and doesn’t get used up in the reaction (so can be used again).
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A catalyst is a chemical or substance that is added to a reaction to speed it up. The catalyst does not change the products formed and doesn’t get used up in the reaction (so can be used again). The reaction rate increases because the catalyst lowers the activation energy needed for the reaction to occur.
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Set up two test tubes in a holder Pour same amounts of hydrogen peroxide into them (about 2cm) In one test tube, put a small amount of manganese dioxide Light a splint and shake it out (so it’s glowing) Place it over the test tube WITHOUT the manganese dioxide – what happens? Now, repeat it, and place the glowing splint over the other test tube – what happens?
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Hydrogen peroxide decomposes slowly to form water and oxygen gas. If a catalyst (manganese dioxide) is added, a rapid supply of oxygen gas is produced
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Hydrogen peroxide decomposes slowly to form water and oxygen gas. If a catalyst (manganese dioxide) is added, a rapid supply of oxygen gas is produced Hydrogen peroxide water + oxygen
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Hydrogen peroxide decomposes slowly to form water and oxygen gas. If a catalyst (manganese dioxide) is added, a rapid supply of oxygen gas is produced Hydrogen peroxide water + oxygen H 2 O 2 H 2 O + O 2
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Hydrogen peroxide decomposes slowly to form water and oxygen gas. If a catalyst (manganese dioxide) is added, a rapid supply of oxygen gas is produced Hydrogen peroxide water + oxygen H 2 O 2 H 2 O + O 2 2H 2 O 2 2H 2 O + O 2
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