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Unit 3 Material changes (experiment equipment (measuring cylinder, beaker,…
Unit 3 Material changes
reversible or irreversible
Irreversible changes
Examples: baking bread, cooking rice, burning wood
Reversible changes
Examples: chocolate melting, dissolving salt in water, freezing water into ice,
soluble or insoluble
can dissolve in a liquid
soluble substance
solution
solvent
solute
investigating dissolving
grain size
temperature
stiring
can not dissolve in a liquid
insoluble substance
suspension
Mixture separation methods
Filtration
to separate insoluble substance from water
sand and water, flour and water
Evaporation
to separate soluble substance from water
salt and water, sugar and water, potassium chloride and water
Sorting
to separate solid mixtures with different color or shape, and big enough to pick out by hand
beans and peanuts
Magnetic attraction
to separate magnetic substance from non-magnetic substance
iron and cooper, steel and sand
Sieving
to separate solid mixtures with different particle size, one can pass through the sieve, the other can not
stone and sand, copper lumps and powder
experiment equipment
measuring cylinder
beaker
glass rod
balance/scale
thermometer
filter paper and funnel
timer
Can I change it back?
Yes
No