OCR Chemistry A – 2.1.3(a,e,f,g) AoS and Ideal Gases

TICK ALL TRUE STATEMENTS

• The total number and type of atoms present are the same at the start and end of a reaction.

• The number of moles is the same at the start and the end of a reaction.

• The total mass of reactants is equal to the total mass of products for any reaction.

• The total volume of gas is the same at the start and the end of a reaction.

TICK ALL TRUE STATEMENTS

• The number of moles is directly proportional to the number of particles for any substance.

• Increasing concentration means more particles in the same volume

• One mole of methane molecules (CH4) contains 1/5 mole of carbon atoms and 4/5 mole of hydrogen atoms.

• One mole of methane molecules (CH4) contains 1 mole of carbon atoms and 4 moles of hydrogen atoms

TICK ALL TRUE STATEMENTS

• One mole of methane (CH₄) contains 1 mole of carbon and 2 moles of hydrogen.

• One mole of methane gas at room temperature and pressure occupies the same volume as one mole of hydrogen gas under the same conditions.

• One mole of methane gas at room temperature and pressure has the same mass as one mole of hydrogen gas under the same conditions

The units of pressure in the ideal gas equation are...

To convert to K

from °C,

you need to

• +273

• –273

• +298

• –298

How many cm³ are in one cubic metre?

• 100

• 1000

• 100 000

• 1 000 000

Which of these is not an assumption made by the ideal gas equation?

• Gas molecules behave as perfect spheres.

• There are strong intermolecular attractions between gas molecules.

• The volume occupied by the molecules is negligible relative to the volume of the container.

• The temperature of the gas is proportional to the average kinetic energy of the molecules.

TICK ALL CORRECT STATEMENTS

• P ∝ T

• n ∝ T

• V ∝ n

• n ∝ P

• V ∝ 1/P