Gas Laws, Moles & Gas Properties

Chemistry Exam Questions from Chapter 8 (Gas laws, Moles and Molecules) - Excluding equilibrium material

What is meant by the term ‘ideal gas’

Obeys the Boyle and Charles gas law at all temperatures and pressures

State the conditions under which real gases come closest to being ideal

Real gases become ideal at high temperature and low pressure

Which one of the noble gases would you expect to behave most like an ideal gas? Justify your answer

Helium : Weakest intermolecular forces

Between Helium, Chloride(2) and Carbon Dioxide, which contains the largest amount of atoms? Justify your answer

Carbon Dioxide according to Avogadro’s Law

State Avogadro’s Law

Equal volumes of gases at the same temperature and pressure. They have the same number if particles

Give two reasons why real gases deviate from ideal behavior at high pressures and low temperatures

Molecules occupy space and Van der Waals forces

What was Gay-Lussac’s observation about reactions involving gaseous reactants and products

There us a small whole number ratio of volumes of reactants and products at the same conditions of temperature and pressure

What is meant by ‘one mole’ of a substance

Amount containing as many particles as the number of atoms in 0.012kg of carbon-12

State Charles’ law

Volume varies directly with kelvin temperature for a definite mass of gas at constant pressure

State Gay-Lussac’s law of combining volumes

The volume measured at the same pressure and temperature of reacting gases and their gaseous products related by small whole number ratios

Give two assumptions of the kinetic theory of gases

Gases made up of particles in rapid and no forces of attraction or repulsion between molecules

Give two reasons why real gases deviate from ideal gas behavior

Have intermolecular forces and molecules take up space

The famous Irish scientist born in 1627 was the son of the Earl of Cork. Give a statement of the gas law that bears his name

Pressure inversely proportional to volume for definite mass of gas at constant temp