C2 Rates of reaction Flashcards
What is rate of reaction?
Speed of chemical reaction – how fast is a chemical reaction
When are reactants used up fastest in a reaction?
At the start of the reaction
Give 4 factors that affect rate of reaction.
Temperature
Concentration
Surface area
Catalyst
What 2 things need to occur for a reaction to take place?
Collide
With enough energy
What is activation energy?
Energy needed to start reaction to break the bonds
Give 3 reasons why increasing temperature increases the rate of reaction.
Increase energy
Move faster
More likely to collide
Why does increasing concentration of a solution increase the rate of reaction?
More particles
More chance of colliding
Why does increasing pressure of a gas increase the rate of reaction?
More chance of colliding
How do you increase the surface area of a marble chip?
Grind it into smaller pieces
What effect does increasing the surface area have on the rate of reaction?
Increase surface area increases rate of reaction
What is a catalyst?
Speeds up a chemical reaction
Without being used up
Why are catalysts important in industry?
Reactions quicker
At lower temperature
So cheaper to make product
Can you use the same catalyst for any reaction?
No – specific
Describe how the volume of gas changes
Volume of gas increases quickly in first 3 to 4 minutes
Then slows down
At 8 minutes no more gas made
If magnesium reacts with hydrochloric acid which of the following will speed up the reaction:
a. Lower temperature
b. Bigger pieces of magnesium
c. More concentrated acid
d. More dilute acid
e. Magnesium powder
f. Increasing the temperature
a. slower
b. slower
c. faster
d. slower
e faster
f faster
