Science Unit 5- C2.1 and C2.2

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When are chemical bonds formed?
When atoms react together
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Why do atoms transfer/share electrons?
To gain a full outer shell
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When is a compound formed?
When two or more different atoms form a chemical bond
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When are Ions formed?
When atoms gain or lose electrons
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What forms a positive Ion?
When metal atoms lose electrons
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What forms a negative Ion?
When non-metal atoms gain electrons
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What is an Ionic bond?
The electrostatic attraction between positive metal ions and negative non-metal ions
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When is a covalent bond formed?
When non-metal atoms share electrons
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How is a giant Ionic structure held together?
By the strong forces of attraction between oppositeky charged Ions
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Are alloys harder than pure metals?
Yes because they contain different sized atoms
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What are Polymers?
They are useful substances that have different properties depending on the raw materials used to make them and the conditions under which they were made.
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What do thermosetting polymers consist of?
They consist of polymer chains held together by cross-links that make them strong (eg. plugs, hairdryers)
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What are thermosoftening polymers?
They do not have cross-links between the polymer chains and therefore there shape can be changed on heating (eg. plastic bag)
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Other cards in this set

Card 2

Front

Why do atoms transfer/share electrons?

Back

To gain a full outer shell

Card 3

Front

When is a compound formed?

Back

Preview of the front of card 3

Card 4

Front

When are Ions formed?

Back

Preview of the front of card 4

Card 5

Front

What forms a positive Ion?

Back

Preview of the front of card 5
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