AQA GCSE Chemistry

Topic Questions

1.1 Simple Model of the Atom

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1 mark

The atomic structure of an unknown element is shown below. 

Ku_H85fR_1-1

What is the atomic number and mass number for the unknown element?

  Atomic Number Mass Number
 A 6 11
 B 5 11
 C 5 6
 D 6 10

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21 mark

 Element Cu has two isotopes. Their mass numbers are 63 and 65. 

  • Cu- 63 has a percentage abundance of 69.2%
  • Cu- 65 has a percentage abundance of 30.8% 

Estimate the relative atomic mass of element Cu.

  • Below 63

  • Between 63.5 and 64

  • Between 64 and 64.5

  • Above 64.5

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31 mark

Niels Bohr was one scientist who contributed to the development of the atomic model. 

What was his discovery?

  • An atom is a ball of positive charge with electrons scattered throughout it

  • An atom is mainly empty space 

  • Mass is concentrated at the centre of the atom called the nucleus

  • Electrons exist in shells and orbit the nucleus at specific distances

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41 mark

Symbol equations always need to have the same number of atoms on both sides.

Which equation is not correctly balanced?

  • H2SO4   +   2NaOH    →   Na2SO4   +   2H2O

  • Ca(OH)2   +   2HCl    →    CaCl2   +   2H2

  • 4Na   +   O­2­    →   2Na­2­O

  • 2Cu   +   HNO3     →      2Cu(NO3)2  +   H2

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51 mark

As the atomic model developed, protons, neutrons and electrons were discovered. 

What is the correct order of discovery?

  First Second Third
 A Proton Neutron Electron
 B Proton Electron Neutron
 C Electron Proton Neutron
 D Electron Neutron Proton

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