Rates Of Reaction

Question 1

2 way you could measure the rate of a reaction-

Answer 1

1 - Measure the rate at which the reactants are used up
2 - Measure the rate at which products are formed

Question 2

5 main factors that affect the reaction rate -

Answer 2

1 - Concentration of solutions
2 - Temperature
3 - Surface area
4 - Catalyst
5 - Pressure of gas

Question 3

A brief summary of collision theory -

Answer 3

Reactant particles collide with each other.
These collisions must have enough energy to lead to bonds being broken between particles

Question 4

Activation energy -

Answer 4

The minimum amount of energy needed for a reaction to occur

Question 5

Exothermic reaction -

Answer 5

A reaction that emits heat

Question 6

Endothermic reaction -

Answer 6

A reaction that absorbs heat

Question 7

Calcium carbonate + hydrochloric acid =>

Answer 7

Calcium chloride + carbon dioxide + water

Question 8

Symbol equation for calcium carbonate +hydrochloric acid

Answer 8

CaCO3 (s) + 2HCl (aq) => CaCl2 (aq) + CO2 (l) + H2O (g)

Question 9

The theory on surface area and reaction rate

Answer 9

Crushing up a solid into a powder increases the surface area to volume ratio.
This means there is a greater area of contact between the solid and the other reactant and more frequent collisions

Question 10

Sodium thiosulfate + hydrochloric acid =>

Answer 10

sodium chloride + water + sulfur dioxide + sulfur

Question 11

Symbol equation for sodium thiosulfate + hydrochloric acid

Answer 11

Na2S2O3 (aq) + 2HCl (aq) => 2NaCl (aq) + H2O (l) + SO2 (aq) + S (s)

Question 12

how catalysts speed up the rate of reaction

Answer 12

The provide an alternative route for the reaction that has a lower activation energy

Question 13

Examples of good catalysts

Answer 13

Transition metals and their many compounds