Share Chemistry unit - Yea 10
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What is an element?
A substance made of one type of atom
What is a compound?
Two or more elements chemically combined
What is a molecule?
Two or more atoms bonded together
What is a pure substance?
Only one type of particle present
What is a mixture?
Two or more substances physically mixed
Give an example of a mixture
Air / saltwater
Can compounds be separated physically?
No (need a chemical reaction)
What pH is neutral?
7
What ion makes acids acidic?
Hydrogen ions (H⁺)
What colour does red litmus turn in a base?
Blue
What are reactants?
Starting substances
What are products in a chemical reaction?
Substances formed
What does it mean to balance an equation?
Same number of atoms on each side
Which state has particles tightly packed in a fixed pattern?
Solid
Which state has particles moving fastest?
Gas
What happens to particles when heated?
They move faster
