9.1 1 Reaction Rate

Question 1

Rate of reaction

Answer 1

Change in conc / time for change to happen

Question 2

To measure rate of reaction

Answer 2

Need to find out

1. How fast one of reactants is being used up
2. how fast one of the products is being formed

Question 3

Concentration time graph

Answer 3

Gradient is the rate of reaction-may have to draw a tangent

Question 4

unit of rate

Answer 4

mol dm-3 s-1

Question 5

concentration of reactant time graph vs concentration of product

Answer 5

reactant will decrease

product will increase

Question 6

two requirements for a reaction to occur

Answer 6

two molecules must collide with sufficient energy (activation energy) to cause a reaction and two molecules must collide with the correct orientation

Question 7

breaking bonds

Answer 7

requires energy

Question 8

making bonds

Answer 8

releases energy

Question 9

orientation

Answer 9

correct atoms must collide

Question 10

steric factor

Answer 10

when shapes of molecules influences reactions

Question 11

if a molecule is particularly large

Answer 11

get in the way of the attacking species -the reaction suffers from steric hindrance

Question 12

activation energy

Answer 12

the minimum energy required that colliding particles must possess for a reaction to occur

Question 13

Magnesium + hydrochloric acid

Answer 13

increase in temp

magnesium chloride and hydrogen

Question 14

sodium thiosulphate +hydrochloric acid

Answer 14

preciptate

Question 15

temperature

Answer 15

increase kinetic energy+activation energy

Question 16

zinc granules +hydrochloric acid

Answer 16

zinc chloride and hydrogen

Question 17

calcium carbonate +hydrochloric acid

Answer 17

calcium chloride and carbon dioxide and water

Question 18

potassium chloride and silver nitrate

Answer 18

silver chloride and potassium nitrate precipitation reaction
one in foil is grey