5.1.2 - How far

Question 1

What does it mean when a reaction is at equilibrium

Answer 1

The rate of forward and reverse reactions are equal

Question 2

What are the methods that can be used to measure equilibrium?

Answer 2

• measure change in colour or colour intensity using colorimeter
• Use a pH probe
• Measure electrical conductivity
• Titration used when equilibriumis slow. so that titration can be completed before there is much change in equilibrium mixture

Question 3

What does mole fraction mean?

Answer 3

The amount of a given component in a given reaction mixture

Question 4

Write the equation used to calculate mole fraction

Answer 4

Mole fraction = number of moles of substance A / total number of moles of all substances

Question 5

What does partial pressure mean?

Answer 5

The pressure exerted by a single species in a reaction vessel

Question 6

What is the symbol for partial pressure?

Answer 6

P

Question 7

Write the equation. used to calculate partial pressure

Answer 7

partial pressure = mole fraction x total pressure

Question 8

What is the relationship between concentration of a substance and its partial pressure?

Answer 8

Concentration of a substance is proportional to. its partial pressure

Question 9

What are the 3 common units of pressure used in chemistry?

Answer 9

Pascals
Atmospheres
Newtons per square metres

Question 10

What type of brackets are used in the Kc expressions?

Answer 10

Square brackets

Question 11

What tupe of brackets are used in Kp expressions

Answer 11

round brackets

Question 12

What is the symbol of equilibrium constant

Answer 12

K

Question 13

What does it mean when K is greater than 1?

Answer 13

Reaction favours product

Question 14

What does it mean when K is less than 1

Answer 14

The reaction favours reactants

Question 15

What is the effect. of increasing temperature on K?

Answer 15

Equilibrium shifts. to the direction. of. endothermic reaction

Question 16

What is the effect of decreasing temperature on K?

Answer 16

Equilibrium shifts to the direction of exothermic reaction

Question 17

What is the only factor that affects K?

Answer 17

Temperature

Question 18

What is the effect of increasing temperature on K for a forward endothermic reaction?

Answer 18

K increases as temperature increases

Question 19

What is the effect of increasing temperature on K for a forward exothermic reaction?

Answer 19

K decreases as temperature increases

Question 20

What effect does a. catalyst have on k?

Answer 20

Catalysts does not affect the position of equilibrium, they. only have an effect on the rate of reaction