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6. Carbonates react with dilute acids to form CO2 gas. This turns limewater:
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.
9. Surfaces of organic compounds, when burned in air will:
10. Unsaturated compounds form single carbon bonds(C-C) whereas saturated compounds form double.(C=C)
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