chemistry

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what is an element
an element is made up of all the same atoms (gold is only made up of gold atoms not silver)the atoms in some elements don't join together but instead join to make molecules
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what is an atom
an atom is a very very small particle that is everything
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what is a molecule
2 or more atoms chemically joined together for example an element
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what is a compound
a compound is a substance which contains 2 or more different elements which are chemically joined (for example water is a compound of hydrogen and oxygen )
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what is a physical change
involves states of matter and energy . A way to know if its a physical change is if its easy to reverse
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what is a chemical change
a chemical change is when a substance combines with another to create another substance . A way to know is if its hard to reverse as most chemical changes are.
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what are the 3 things required for combustion
fuel oxygen heat
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what is the word equation for combustion
fuel + oxygen = CO2 + water
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what is thermal decomposition
breaking down compounds using heat into simpler substances
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what is oxidation
a chemical reaction that involves adding oxygen
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what is a chemical reaction
it makes a new substance while the atoms rearrange themselves and join back together in a different way
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Other cards in this set

Card 2

Front

what is an atom

Back

an atom is a very very small particle that is everything

Card 3

Front

what is a molecule

Back

Preview of the front of card 3

Card 4

Front

what is a compound

Back

Preview of the front of card 4

Card 5

Front

what is a physical change

Back

Preview of the front of card 5
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