7.1, 7.2 Physical vs Chemical Changes, RoR

Physical changes
(reversible/irreversible) & (does/doesn’t) change chemical comp. of substance

reversible, doesnt

Chemical changes
(reversible/irreversible) & (does/doesn’t) change chemical comp. of substance

irreversible, does

Formula rate of reaction =

change q measured / change time

Define rate of reaction

Rate at which products are formed

Collision particle theory
> chemical r__ only occur when r__ particles collide w/ s__ e__ to react

reactions, reactant, sufficient energy

Define activation energy

min amt of energy needed for reaction

Factors affecting RoR
1. C__
> ↑C = ↑r__ particles if same __

conc, reactant, volume

Factors affecting RoR
2. P__ s__
> breaking up solid = s__ pieces = ↑s_ _
> ↑sa = ↑particles exposed to r__ = ↑collisions = ↑r__

particle size, smaller, sa, react, rate

Factors affecting RoR
3. T__
> ↑T = ↑E__ = move f__ = collide more freq
> ↑proportion of particles w/ a__ e__
> thus ↑successful collisions = ↑r__

temp, Ek, faster, activation energy, rate

Factors affecting RoR
4. G__ __
> ↑ = ↓V = gas particles s__ closer = ↑collisions = ↑r__

gas pressure, squashed, rate

Factors affecting RoR
5. C__
> lowers a__ e__

catalyst, activation energy