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6. Crude oil is a mixture of compounds called
- Hydrocarbons
- Propane
- Carbon
- Methane
7. Acids have a ph scale lower than
8. Covalent bonding is between
- Metal and non metal
- Plasics
- Two non metals
- Metals
9. What is endothermic reactions
- Take in energy from the surroundings
- Transfer energy to the surroundings
- Makes energy
- Creates chemicals
10. The centre part of an atom is called the
- Electron
- Nucleus
- Proton
- Neutrons
11. What is the centre of the earth called
- Inner core
- Outer core
- Mantle
- Crust