Chemistry unit A

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  • Created by: tahmida
  • Created on: 30-12-12 19:58
What is in the middle of the atom?
The Nucleus
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How are protons and Neutrons charged?
protons= positively charged Neutrons= no charge
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How are electrons charged?
They are negatively charged
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How many atoms does elements consist of?
one
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what is this symbol 'Mg'?
Magnesium
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How many electrons are aloud in each shell?
1= 2 electrons, 2= 8 electrons, 3=8 etc
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What happens when different elements react?
atoms form a chemical bonds
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What happens in chemical reactions to atoms?
Atoms aren't lost or made
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What is the equation for limestone?
calcium carbonate-->calcium oxide+carbon dioxide
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what is the equation when acid is reacted?
calcium carbonate+sulfuric acid--> calcium sulfate+carbon dioxide+water
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What is the equation for limestone when reacted with water?
calcium oxide+ water--->calcium hydroxide
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What are the disadvantage's on quarrying limestone?
noisy, and dusty and ruins landscapes
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What are the advantages of quarrying limestone?
you get dyes,paints, medicines and neutralise's acidic soil
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state one advantage and disadvantage of limestone's products?
pro- widely available con-some are very unattractive
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why is recycling metals important?
fossil fuels will run out soon
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Card 2

Front

How are protons and Neutrons charged?

Back

protons= positively charged Neutrons= no charge

Card 3

Front

How are electrons charged?

Back

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Card 4

Front

How many atoms does elements consist of?

Back

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Card 5

Front

what is this symbol 'Mg'?

Back

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