C5.2.4 - Particle size and reaction rate Flashcards
1
Q
Why do reactions go faster at high surface area?
A
- more reactant particles are available for collisions
- collisions are more likely, so particles collide more often
2
Q
Why do reactions when a substance a big lump of a substance is broken down into smaller lumps?
A
Powders have an even larger surface area so their reactions are very fast
3
Q
As the size of the lumps decreases…
A
the surface area to volume ratio increases
