Science Revision

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What is needed to join two elements and form a compound?
A chemical reaction
1 of 10
How do you define a chemical reaction?
A new substance is created, energy changes happen or colour changes can all prove a chemical reaction occurred
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True or False: after a chemical reaction, the mass of the substances is the same
True- mass is conserved as they are the same atoms
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What is oxidation? Give an example
Joining oxygen with a substance. Iron + Water + oxygen ---> hydrated iron oxide (rust)
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What is exothermic and endothermic energy?
exothermic gives out heat energy and endothermic absorbs heat energy
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What is reduction?
removing oxygen from a substance. Happens in smelting or getting metal from an ore
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Thermal Decomposition- what is it?
breaking down a substance by heating it. e.g.- copper carbonate + heat ---> copper oxide + carbon dioxide
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What is Electrolysis?
using electricity to break down a compound.
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What are the products of burning (combustion)?
hydrocarbons burn to give carbon dioxide and water.
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What are the tests for carbon dioxide and water?
water makes anhydrous copper sulphate blue and carbon dioxide turns limewater milky
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Other cards in this set

Card 2

Front

How do you define a chemical reaction?

Back

A new substance is created, energy changes happen or colour changes can all prove a chemical reaction occurred

Card 3

Front

True or False: after a chemical reaction, the mass of the substances is the same

Back

Preview of the front of card 3

Card 4

Front

What is oxidation? Give an example

Back

Preview of the front of card 4

Card 5

Front

What is exothermic and endothermic energy?

Back

Preview of the front of card 5
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