IGCSE Chemistry Revision

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

What is the mass number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

Tags

NGSS.HS-PS1-1

Nitrogen will form which of the following ions?

• N
• N^-3
• N^-5
• N⁺⁵

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A substance that dissolves in a liquid is called the...

• Solvent

• Solute

• Solution

• Salient

Which of these statements about the halogens is incorrect?

• They are reactive because they easily gain one electron

• They form ions with a charge of +1

• They include fluorine, chlorine, bromine and iodine

• They get less reactive as their atomic number increases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the correct formula of silver nitrate?

• AgNO₃

• AgNO₂

• Ag(NO₃)₂

• Ag₂NO₃

What is the correct formula of magnesium sulphate?

• Mg(SO₄)₃

• MgSO₄

• MnSO4

• Mg(SO₄)₂

Tags

NGSS.MS-PS1-1

What is the correct formula of calcium hydroxide?

• Ca(OH)₃

• Ca(OH)₂

• CaOH

• Ca₂OH