Chemistry inside materials

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What do most gases exist as?
molecules
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What do scientists use to represent molecules?
Formulae
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What do little numbers represent in formulae?
The number of atoms in the molecule
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How are the atoms in molecules joined?
They are joined strongly together
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How do you split up molecules?
Chemical reactions
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Is it difficult or easy to spilt up molecules into seperate atoms?
Difficult
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Why do gases diffuse?
Because their particles are not attracted to each other
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What do gases consist of?
Tiny particles
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How do particles diffuse?
The particles are seperate from each other and they move around quickly. As they move around they spread out or DIFFUSE
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What is the atmosphere?
A layer of air that surrounds the Earth which contains gases that living things need, and helps to keep the Earth warm enough for life
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What is the composition of the atomsphere?
78% Nitrogen, 21% Oxygen, 1% Argon, 0.04% Carbon dioxide
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What has changed the atomsphere?
We have burnt fossil fuels and cut down trees which adds carbon dio
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What is a molecule?
The smallest part of a substance that can take part in a chemical reaction
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What is a polymer?
A long molecule made up of many small molecules joined together
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What is a monomer?
A small molecule that can bond to others like itself to form a polymer
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Name some natural polymers
Cotton, silk, rubber, wool
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Name some synthetic polymers
PVC, polythene, polystyrene, polyester
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How are natural polymers made?
In chemical reactions in plants and animals
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How are synthetic polymers made?
By people and machines using chemical reactions in factories and science labs
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Name a biologic polymer
DNA, protein
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Why is copper strong?
Because the atoms are strongly attached to each other and are difficult to seperate
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Why is copper bendy?
Because its atoms are arranged in layers so they slide over each other when you bend the copper
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Why does copper conduct heat well?
Because the atoms are close together so when one atom vibrates it can easily pass on its vibrations to the next atom
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Why does copper conduct electricity?
Because the electrons are free to move
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How are the particles arranged in salts?
Alternately in rows. They are held together in a grid-like structure
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Why is sodium chloride brittle?
Because of the regular arrangement, it is easy to break along certain lines of the pattern
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What keeps the sodium and chlorine particles in place?
The strong attraction between them
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What is the independent variable?
What we choose to change
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What is the dependent variable?
What we measur e
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Other cards in this set

Card 2

Front

What do scientists use to represent molecules?

Back

Formulae

Card 3

Front

What do little numbers represent in formulae?

Back

Preview of the front of card 3

Card 4

Front

How are the atoms in molecules joined?

Back

Preview of the front of card 4

Card 5

Front

How do you split up molecules?

Back

Preview of the front of card 5
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