1
Q
how do we measure a reaction rate?
A
by collecting the gas given over time OR measure change in mass over time OR measure change in colour
2
Q
what do we do to see if a substance becomes cloudy/ changes colour over time?
A
black cross test - if it disappears under the pot the substance has changed
3
Q
how can particles only react? what is this called?
A
they collide with enough energy ➡️ collision theory
4
Q
what 4 things change the rate of reaction?
A
- temperature
- surface area
- concentration
- and use of a catalyst
5
Q
increasing the temperature causes …
A
- particles to move faster
- collide more
- faster rate of reaction
6
Q
increasing concentration causes …
A
- more particles to collide and react
7
Q
increasing surface area causes …
A
- more collisions and faster reaction
8
Q
using a catalyst causes …
A
- more collisions
- faster reaction
9
Q
what is the collision theory?
A
reacting particles must collide with enough energy in order to react
Chemistry C2
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