Year 8 Science

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Name the three variables and what they mean
The independent variable (what you change), the dependent variable (what you measure) and the control variable (what stays the same)
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What 3 things are in a risk assessment?
The hazards, risks and preventions
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Define atom
Its the smallest particle in exsistance
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Define an element
Its a substance that is made up of only one type of atom
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What is a molecule?
Its more then one atom bonded together
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What is a compound?
Its two or more different elements that are chemically bonded together
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What is a mixture?
Its two or more different substances that are not chemically bonded
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Explain the structure of an atom
Its has a nucleus which contains protons and neutrons. Outside of that is the shells. they have electrons on them. The first shell can have a maximum of two electrons on them and the rest can have eight.
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In a element symbol, what does top number stand for?
The mass number (protons + neutrons)
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In a element symbol, what does bottom number stand for?
The atomic (proton) number (number of protons
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How do you calculate how many protons are in an element?
Look at the proton number
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How do you calculate how many electrons are in an element?
Its the same as the proton number
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How do you calculate how many neutrons are in an element?
Do the mass number - the proton number
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Other cards in this set

Card 2

Front

What 3 things are in a risk assessment?

Back

The hazards, risks and preventions

Card 3

Front

Define atom

Back

Preview of the front of card 3

Card 4

Front

Define an element

Back

Preview of the front of card 4

Card 5

Front

What is a molecule?

Back

Preview of the front of card 5
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