How does a catalyst work in speeding up a reaction?

By lowering the activation energy or reaction

Why does a higher concentration increase the rate of reaction?

it increases the frequency of particle collisions

it increases the amount of reactants

it lowers the activation energy

it increases the energy of particle collisions

Why does a higher temperature increase the rate of a reaction?

it increases both the frequency and energy of particle collisions

it only increases the frequency of particle collisions

it only increases the energy of particle collisions

it reduces the activation energy of the reaction

Why don't all collisions between particles cause a reaction?

not all the particles collide with enough energy

the particles also need to collide with a catalyst

not all the particles collide at a high enough temperature

the particles need to collide with each other twice

What is the rate of reaction?

How much gas a reaction produces

What is dynamic equilibrium ?

The rate of forward and backward reaction is equal

How does a catalyst affect the position of the equilibrium?

It does not. It only increases the rate of reaction.

Position of equilibrium will shift to the right.

Position of equilibrium will shift to the left.

What would be the effect of increasing the temperature to the equilibrium of an exothermic reaction?

equilibrium shifts to the right

no change in position of equilibrium

What would be the effect of increasing the temperature to the equilibrium of an endothermic reaction?

equilibrium shifts to the right

no change in position of equilibrium

What would be the effect of increasing the concentration of the product on the position of the equilibrium?

equilibrium shifts to the right

no change in position of equilibrium

What would be the effect of decreasing the concentration of the reactant on the position of the equilibrium?

equilibrium shifts to the right

no change in position of equilibrium

When pressure is increased, the position of the equilibrium will shift to the side that has...

less number of gaseous molecules

more number of gaseous molecules

3H 2 (g) + N 2 (g) ⇌ 2NH 3 (g) ΔH = −197 kJ/mol Which of the following factors would shift the equilibrium position to the right? (Choose 2)

increase concentration of nitrogen gas

increase pressure of the equilibrium

increase temperature of the equilibrium

H 2 (g) + I 2 (g) ⇌ 2HI (g) What would be the effect of increasing the pressure on the position of equilibrium?

no change in position of equilibrium

equilibrium shifts to the right

26. Once the Ammonia is separated from the Nitrogen and Hydrogen what is done with the spare Nitrogen and Hydrogen?

a) The Hydrogen is sold as it is an expensive commodity and the Nitrogen is discarded.

c) The Nitrogen is is sold as it is an expensive commodity and the Hydrogen is discarded.

d) Both are discarded as it is too expensive to separate them.

21. Which statement most accurately describes why a higher pressure is not used in industry for the production of Ammonia?

c) Structural integrity of any reaction vessel would be compromised

d) The rate of reaction would be too fast

22. Explain why only a moderately high temperature is used in industry for the production of Ammonia.

a) Produces a lower % yield but at a faster rate

b) Produces a higher % yield but at a faster rate

c) Produces a lower % yield but at a slower rate

d) Produces a higher % yield but at a slower rate

What are the usual conditions of the Haber Process

100'C, 200 atm, Diamond Catalyst

How do catalysts increase the rate of reaction?

the activation energy is lowered

The frequency of collisions is the increased

the energy of collisions is increased

Both the frequency and energy of collisions is increased

Identify the labels (a) and (b) on the graph.

a is concentration of reactants and b is the concentration of product

a is concentration of product and b is the concentration of reactant

a is the volume of reactants and b is the volume of product

a the mass of reactants and b is the mass of product

What is a closed system

The reactants and the products do not escape from reaction mixture

The reactants and the products escape from he reaction mixture to be kept in the system

In an endothermic reaction the products have

the same energy as the reactants

In an exothermic reaction the products have

the same energy as the reactants

IGCSE Chemistry - Reversible reactions and equilibrium Quiz

45 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of reactions can able to change products back to the their original form?

Reversible reactions

Irreversible reactions

Combustion reactions

Combination reactions

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following changes is irreversible change?

Melting of ice cube

Heating hydrated CuSO₄

Frying an egg

Thermal decomposing NH₄Cl

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following combination is correct?

reversible ⇌

irreversible →

reversible ←

irreversible →

reversible ⇌

irreversible ←

irreversible ⇌

reversible →

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If a reversible reaction is exothermic in the forward direction, it will be ...

exothermic in the reverse direction

endothermic in the forward direction too

endothermic in the reverse direction

not involve energy in reverse direction

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of these is NOT a reversible change?

Water to Ice

Juice to ice lolly

Cookie Dough to Cookie

Melting Chocolate

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A substance that increases speed of chemical reaction without being being changed is called:

Catalyst

Acid

Base

pressure

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Increase in temperature of the reactants can do one of the following

Slow collision frequency

Allow less effective collision between the particles

Cause particles to lose speed

Increase collision between the particles thus increasing the rate.

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IGCSE Chemistry - Reversible reactions and equilibrium

What type of reactions can able to change products back to the their original form?

Which of the following changes is irreversible change?

Which of the following combination is correct?

If a reversible reaction is exothermic in the forward direction, it will be ...

Which of these is NOT a reversible change?

A substance that increases speed of chemical reaction without being being changed is called:

Increase in temperature of the reactants can do one of the following

What is the color of the reactant ?

What is the color of product ?

A temperature increase causes the particles ......

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