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6. What is the general formula for alkenes?
7. What method is used to separate crude oil?
- Hydration
- Fractional distillation
- Thermal decomposition
- Cracking
8. Electrolysis is:
- A form of displacement with carbon.
- Splitting up ionic compounds using electricity.
- Generating electricity by burning fossil fuels.
- Splitting radioactive nuclei.
9. Which of these chemical symbols is incorrect?
- Tungsten - Tg
- Potassium - K
- Osmium - Os
- Silver - Ag
10. What does limestone thermally decompose to form?
- Calcium dioxide and carbon dioxide
- Calcium oxide and water
- Calcium oxide and carbon dioxide
- Calcium dioxide and carbon monoxide
11. Why are alloys stronger and harder than pure metals?
- The added metal is harder than the original metal.
- The atoms are now bigger so there is less room to move.
- Different sized atoms disrupt the regular arrangement of atoms and so the layers cannot slide over each other.
- Different types of free electrons repel each other and so keep the metal in a certain shape.
12. What is ionic bonding?
- Giant structure of transition metals.
- A metal loses electrons to a non-metal and the electromagnetic forces attract the atoms together.
- Metals in a lattice with delocalised electrons.
- Non-metals which share electrons.
13. In an ion, the number of electrons equals the number of protons