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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

  • 2
  • 7
  • 9
  • 4

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