Rates if Reaction YEAR 10 Flashcards
1
Q
3 ways to find a rate of reaction
A
Gas produced/time
Mass loss/time
1/Time for X to ‘disappear’
2
Q
Why does a piece of magnesium react more slowly over time?
A
As more is used up, sf area is less.
Less in contact with HCL, less can collide at once
3
Q
Catalyst
A
a substance which lowers the activation energy needed for a reaction to occur
4
Q
Activation energy definition
A
The minimum amount of energy needed for a reaction to occur
5
Q
Core practical:
Measure rate of reaction via production of gas
A
-In beaker put marble chips and HCl
-Put bung on opening
-Connect to gas syringe
-Use Gas vol/time
6
Q
Core practical: Investigate rate of reaction via colour change (sodium thiosulfate)
A
-Draw X on paper
-Place conical flask
- rate = 1/Time for X to ‘vanish’
