Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

What is the volume of a gas in a closed system working under ideal conditions at r.t.p of 1.5 moles of gas?

PV = nRTP =101 kPa = 101 000 PaV =?T= 298 KR = 8.314 J K^-1mol^-1n = 1.5 molV = nRT / P = 1.5 mol x 8.314 J K^-1mol^-1 x 298 K / 101 000 Pa = 0.0368 m³<...

Answered by Theo B. • Chemistry tutor

1342 Views

A sample of the ore haematite contains 70% iron oxide. Calculate the amount of iron oxide in 2000 tonnes of haematite.

2000 tonnes H0.7 x 2000 tonnes = mass of iron oxide = 1400 tonnes

Answered by Daisy O. • Chemistry tutor

3519 Views

Describe and explain how increasing concentration of a reactant changes the rate of reaction.

When you increase the concentration of a reactant, there are more reactant particles in a given volume of space. Consequently, there will be more collisions between the particles in a given amount of time...

Answered by Emily B. • Chemistry tutor

1533 Views

How can the rate of a reaction involving gaseous molecules be increased?

If the pressure of a reacting gas is increased:the reactant particles are closer togetherthe frequency of collisions between reactant particles increasestherefore the rate of reaction inc...

Answered by Louise L. • Chemistry tutor

1434 Views