Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

What exactly is meant by 'balancing equations'?

Chemical reactions can be written as an equation with molecules on each side of the equation. Balancing equations is about ensuring that the number of atoms of each element on the left hand side of an equ...

Answered by Michael F. • Chemistry tutor

2154 Views

What is a method that you can use for balancing equations?

Below is 2 examples of questions that you could be asked. During the session, I will run through on the whiteboard, a good method of completing this style of question. _GaF₃ + _Na₃PO...

Answered by Adit B. • Chemistry tutor

1607 Views

Calculate the pH of the buffer solution resulting from mixing 250 cm^3 of 0.3 moldm^-3 ethanoic acid with 250cm^3 of 0.2 moldm^-3 sodium hydroxide. The Ka of ethanoic acid is 1.8 x 10^-5.

As an acid is being added to a base, you first need to calculate what is left after they react. Without doing any calculations, we can already see that the acid is in excess as both solutions have the sam...

Answered by Tutor125302 D. • Chemistry tutor

5468 Views

What is a mole?

A mole is a measure of quantity, such that when you have a mole of something, you have 6.02 x 10²³ atoms/molecules of it. The number of atoms/molecules in a mole is called "Avogadro's Numb...

Answered by Amy F. • Chemistry tutor

1711 Views

What characteristic ion can denote the difference between an acid and an alkali and give an example?

For an acid the formation of a hydrogen ion denotes it as being acidic.HCL -> H+ + CL-Where as for an alkali the formation of a hydroxyl ion denotes is as being alkaliNAOH -> Na+ and OH-

Answered by Scarlett K. • Chemistry tutor

1883 Views