Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Describe the structure of metal and its bonding and how its structure contribute to its properties.

Metals have a distinct bonding known as metallic bonds, where there is a sea of delocalised electrons and metal ions present. This is due to electrons leaving the atom forming a positive metal ion and a s...

Answered by Ann P. • Chemistry tutor

6993 Views

A colourless liquid is tested with silver nitrate solution and produces a white precipitate and produces a brick red flame test result. Name the compound found in the colourless liquid

The silver nitrate test is a test for halide ions and the flame test is a test for metal ions, since they produced positive results you have an ionic substance. The result of a white precipitate is the po...

Answered by Lui H. • Chemistry tutor

4896 Views

What is Le Chatelier's principle and why is it important?

Le Chatelier's principle states, that when a system that is in equilibrium is subject to a change of concentration, volume, pressure or temperature, the equilibrium will shift to counteract this change. T...

Answered by Isabelle H. • Chemistry tutor

3894 Views

0.0960g of Magnesium was reacted with 25cm^3 of HCL of 0.4mol/dm^3 concentration. Calculate the moles of each one and determine which one is in excess

Equations to usemoles = mass/Mrmoles= concentration*volumeAr of Magnesium = 12 Moles= 0.096/12 Moles=0.008Moles of HCL = 25/1000 x 0.4=0.1Therefore HCL is in excess

Answered by Tom G. • Chemistry tutor

3697 Views

Sodium’s atomic number is 11 and its mass number is 23. How many protons, electrons and neutrons does it have?

The mass number defines the number of protons and neutrons in an atom. The atomic number shows the number of protons in an atom (nucleus). Because there is the same number of protons as e...

Answered by Charlotte M. • Chemistry tutor

49314 Views