Rates Of Reaction

Question 1

Catalysts?

Answer 1

Substances that speed up chemical reactions. Catalysts usually don’t need to be replaced because they are not used up. It requires less activation energy needed to start the reaction

Question 2

Enzymes?

Answer 2

Large complex protein molecules that act as catalysts in biological reactions

Question 3

Things that affect rate of reaction?

Answer 3

Energy with which particles collide
Frequency of collision 
Concentration 
Temperature 
pressure 
Surface area
Catalyst

Question 4

Activation energy?

Answer 4

Minimum amount of energy needed for the particles to react. Different for each reaction

Question 5

Rate if reaction equation

Answer 5

Rate of reaction = y/x

Question 6

Limiting reactant?

Answer 6

Substance that runs out first. When the limiting reactant runs out then the reaction will stop

Question 7

Exothermic reaction?

Answer 7

Release energy
Reactants have more energy than products
Neutralisation burning

Question 8

Endothermic reaction?

Answer 8

Absorb energy
Products have more energy than reactants
Electrolysis

Question 9

Respiration?

Answer 9

Burning of glucose- exothermic

Question 10

Collision theory?

Answer 10

Substances react when their particles collide together.
At high temperature those particles have more energy and more faster, creating more successful collisions.
Higher surface area means more particles available to collide and react, faster reaction
Higher concentration/pressure means more particles in a fixed volume, this means there is a higher chance of successful collisions.