C2 Rates of reaction Flashcards
Give 4 factors that affect rate of reaction.
Temperature
Concentration
Surface area
Catalyst
What is an anomalous result?
Does not fit on best line of fit
Higher or lower than expected
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
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
Give 3 reasons why increasing temperature increases the rate of reaction.
Increase energy
Move faster
More likely to collide
Can you use the same catalyst for any reaction?
No – specific
What 2 things need to occur for a reaction to take place?
Collide
With enough energy
What is a catalyst?
Speeds up a chemical reaction without being used up
Is a line of best fit always a straight line?
no
Why does increasing concentration of a solution increase the rate of reaction?
More particles
More chance of colliding
How can an anomalous result be caused in a rates of reaction experiment?
Mistake in measuring amount of product or amount of reactant
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
When are reactants used up fastest in a reaction?
At the start of the reaction
How do you increase the surface area of a marble chip?
Grind it into smaller pieces
