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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?
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