Year 10 CHEMISTRY Revision

The chemical symbol for iron is:

• Ir

• Fe

• Cu

• I

The chemical symbol for gold is:

• Gd

• Ag

• Au

• Cu

Which of the statements below about the periodic table is true?

• All elements found in period 3 are metals

• The elements are arrange in increasing atomic number

• The elements in groups 17 and 18 are metals

• The elements are arranged in increasing atomic mass

This substance is always only made up of one type of atom:

• Compound

• Element

• Mixture

• Molecule

Element X has 8 protons, 9 neutrons and 8 electrons. From this data we can conclude that its:

• atomic number is 17

• mass number is 25

• atomic number is 8

• mass number is 16

Which of the following would be a positive test for the gas H₂?

• A squeaky pop is heard when the gas is lit

• The gas would turn lime water cloudy

• Litmus paper turns blue

• A yellow precipitate is formed in water

Which of the following best describes the structure of the atom?

• a negatively charged nucleus of protons and neutrons orbited by electrons

• a negatively charged nucleus of electrons and neutrons orbited by protons

• a positively charged nucleus of protons and neutrons orbited by electrons

• a positively charged nucleus of electrons and neutrons orbited by protons

If the two ions K⁺ and SO₄^2- are combined, the formula of the resulting compound would be:

• KSO₄

• K₂SO­₄

• K(SO₄)₂

• K₄SO

The name of the compound Na₂CO₃ is:

• Sodium carbontrioxide

• Nitrogen carbonate

• Nitrogen trioxide

• Sodium carbonate

Important in the understanding of how electrons orbit the nucleus is that:

• Positive and negative charges attract one another

• Positive and negative charges repel one another

• Both positive and negative charges are attracted to particles with no charge

• Both positive and negative charges are repelled by particles with no charge