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6. Carbonates react with dilute acids to form CO2 gas. This turns limewater:

  • Milky
  • Brown
  • Yellow

7. Al3+, Ca2+, and Mg2+ ions all form a:

  • White precipitate
  • Green precipitate
  • Brown precipitate
  • Blue precipitate

8. Nitrate ions (NO3-) form ammonia ions when sodium hydroxide is added.

  • True
  • False

9. Surfaces of organic compounds, when burned in air will:

  • Char
  • Go brown
  • Dissolve

10. Unsaturated compounds form single carbon bonds(C-C) whereas saturated compounds form double.(C=C)

  • False
  • True

11. If bromine water is shaken with an unsaturated organic compound it would change from:

  • Brown to colourless
  • Colourless to brown
  • Brown to yellow

12. Instrumental methods are the best option for identifying elements and compounds because:

  • They are very easy to use
  • They are very accurate
  • They are the newest technology

13. In an exothermic reaction,

  • Energy is lost
  • Energy is gained
  • The energy stays the same.

14. This means that:

  • The products have the same amount if energy as the reactants.
  • The products have less energy than the reactants.
  • The products have more energy than the reactants

15. Breaking bonds is an:

  • Endothermic process
  • Exothermic process
  • A chemical reaction

16. What type of food will provide the most energy:

  • Fats + Oils
  • Carbohydrates
  • Proteins
  • Fibre

17. One calorie is equal to:

  • 42 joules
  • 4.2 joules
  • 420 Joules

18. Relative amounts of energy produced my food can be measured by:

  • Titration
  • Thermal decomposition
  • Calorimetry
  • Combustion

19. Hard water can result in extra costs for heating elements in appliances as it forms scale. This is because of its:

  • Ca2+ and Mg2+ ions
  • Cu2+ and Fe2+ ions
  • Al3+ and Fe3+ ions

20. Hard water is often said to be good for human health as it's ion content helps:

  • Reduce the risk of cancer.
  • Reduce the risk of heart disease
  • Reduce the risk of tumors