Unit 1 - Physical Chemistry

Question 1

What is a mole?
How much is a mole?

Answer 1

A standard scientific unit for measuring large quantities of very small entities (atoms, molecules, etc.)
6.02 x 10^23

Question 2

How do you calculate moles from masses?

Answer 2

Moles = mass (grams) / molar mass

Question 3

How do you calculate concentration from moles?

Answer 3

concentration = moles / volume (dm^3)

Question 4

How do you convert cm^3 to dm^3?

Answer 4

dm^3 = cm^3 / 1000

Question 5

When the concentration of a reagent in a reversible reaction is increased on the right side, which way does the equilibrium shift?

Answer 5

To the left (opposite side)

Question 6

When the concentration of a reagent in a reversible reaction is decreased on the right side, which way does the equilibrium shift?

Answer 6

To the right (same side)

Question 7

When the temperature of a reversible reaction is decreased, which type of reaction is encouraged?

Answer 7

The exothermic reaction is encouraged (endothermic reaction is defavoured)

Question 8

When the temperature of a reversible reaction is increased, which type of reaction is encouraged?

Answer 8

The endothermic reaction is encouraged

Question 9

When the concentration of a reagent in a reversible reaction is increased, which way does the equilibrium shift?

Answer 9

Towards the side with fewer particles

Question 10

When the concentration of a reagent in a reversible reaction is decreased, which way does the equilibrium shift?

Answer 10

Towards the side with more particles