a substance that consists of only one type of atom
carbon - used in pencils
oxygen - in breathing equipment
tin - coating in a food can
chlorine - in swimming pool water
mercury - used in some thermometers
all metals are to the left of the staircase
all non-metals are the right of the staircase
chemicals
apparatus
if you put a lit splint into the gas and it makes a squeaky pop then the gas is hydrogen
compound - a substance that contains two or more element chemically joined
molecule - particle which consists of two or more atoms chemically joined
a red glow spreads through the mixture and a grey/black solid forms (chemical reaction)
sodium chlorine (common salt) → sodium (very reactive silver metal) + chlorine (poisonous green gas)
water → hydrogen (colourless gas that pops when burned) + oxygen (colourless gas that supports burning)
carbon dioxide → carbon (black solid) + oxygen (colourless gas that supporting burning)
non-metal changes ending to ‘ide’
behaves the same way as substances present behave
no chemical reaction
can be made in any proportion
has new properties
chemical change
made in fixed proportions
when separating mixtures such as sand and gravel since the sand will pass through but the gravel will not
chromatography - technique for separation of mixture into its components
to save finite resources and finite elements
when trying to remove a solid from a solution