Changes and Reactions
Cutting Paper
Physical Change
Fixed shape and volume
solid
Basic unit of an element
Atom
Matter has mass and takes up__
space
Factor intentionally changed
independent variable
Rusting Iron
Chemical Change
Particles far apart/free
gas
One type of atom makes a(n)
element
tool for liquid volume
graduated cylinder
Factor measured
Dependent variable
Name a possible reaction evidence
Gas production, new solid, Sustained or unexpected temperature, light change, color or odor change
Solid-Liquid
Melting
different elements chemically combined
compound
water 20->35mL; object volume
15mL
why keep controls the same
fair test
Matter in ordinary changes
Conserved
Gas-Liquid
Condensation
salt water is what type of mixture
homogenous/solution
Density formula
Mass/volume
why multiple trials
improve reliability
Why can mass appear lower in an open system
Matter/gas can leave
Add thermal energy-average particle motion generally
Increases
salt water: solute and solvent
salt; water
42g/14 cm3=
3g/cm3
The substance may be reacting 'Observation or inference
Inference