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The concentration of the sulfuric acid
The pressure at which the reaction takes place
The size of the particles of copper(II) oxide
The temperature of the reacting mixture
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Pieces of solid - larger; acid - less concentrated; temperature - lower
Pieces of solid - larger; acid - more concentrated; temperature - higher
Pieces of solid - smaller; acid - less concentrated; temperature - lower
Pieces of solid - smaller; acid - more concentrated; temperature - higher
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It increases the yield of the product.
It increases the speed of the reactant particles.
It increases the activation energy of the reaction.
It provides an alternative pathway for the reaction to occur.
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40 g of HCl in 1000 cm3 of water.
20 g of HCl in 1000 cm3 of water.
15 g of HCl in 500 cm3 of water.
10 g of HCl in 100 cm3 of water.
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A black solid and a colourless liquid
A black solid and a blue liquid
A blue liquid only
A light blue solid and a colourless liquid
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It increases the yield of the products.
It makes the reaction more exothermic (heat releasing).
It lowers the activation energy of the reaction.
It prevents a reverse reaction from occurring.
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An insoluble layer of calcium chloride is formed on the calcium carbonate.
The pieces of calcium carbonate gradually become smaller.
The calcium carbonate is covered by bubbles of carbon dioxide.
The concentration of hydrochloric acid gradually reduces to zero.
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The amount of magnesium is decreasing
The magnesium is acting as a catalyst
The solution is becoming hotter
The surface area of the magnesium is increasing
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The synthesis of ammonia
The fermentation of sugar
The oxidation of sulfur dioxide
The electrolysis of sodium chloride
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