2.2 - 3.3 - Maths Skills

Question 1

What does the Avogadro constant represent?

Answer 1

The number of atoms per mole of the carbon-12 isotope

Question 2

How to calculate the mass of 1 mole of the element?

Answer 2

Mass of 1 mole= relative atomic mass in grams

Question 3

State Avogadro’s law

Answer 3

Under the same temperature and pressure one mole of any gas would occupy the same volume

Question 4

Why do different gas particles occupy the same volume?

Answer 4

The gas particles are very spread out hence individual differences has no effect

Question 5

What are the ideal ways in which gases behave?

Answer 5

• they are in continuous motion
• no intermolecular forces experienced
• exert pressure when they collide with each other or container
• no kinetic energy or lost in the collisions
• when temperature increases = kinetic energy of gases also increase

Question 6

1 atmospheric pressure isequal to how many pascal?

Answer 6

101325 Pa

Question 7

0°C is equal to how many kelvin?

Answer 7

273k

Question 8

What does concentration of a solution mean?

Answer 8

Its the amount of solute dissolved in 1dm^3 of solvent

Question 9

What does the term concentrated mean?

Answer 9

Large amount of solute per Dm^3 of solvent

Question 10

What does the term dilute mean?

Answer 10

Small amount of solute per dm^3 of solvent

Question 11

What are the reasons for not obtaining 100% yield?

Answer 11

• reaction may be at equilibrium
• the reactants may be impure
• side reactions can occur
• reactants or products may be left behind while transferring
• loss of products during separation and purification

Question 12

Which type of reactions have 100% atom economy?

Answer 12

Addition reactions