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6. What are the groups in the periodic table?

  • A column of similar elements
  • A row of similar elements
  • The boxes in the table

7. Which statement about chemical reactions is correct?

  • The mass of products is less than the mass of reactants
  • The mass of products equals the mass of reactants
  • The mass of products is more than the mass of reactants

8. A unit of magnesium carbonate contains one magnesium atom, one carbon atom and three oxygen atoms. What is its chemical formula?

  • MgCO3
  • Mg(CO)3
  • MgC3O

9. The atoms in an element are:

  • All the same type
  • Two types joined together
  • About a hundred different types

10. The correct balanced equation for the reaction between magnesium and oxygen is:

  • Mg + O2 ==> Mg2O
  • 2Mg + O2 ==> 2MgO
  • Mg + O ==> MgO2