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6. What is an isotope ?

  • non
  • Atomic number
  • Atomic number and mass number
  • Mass number

7. What's in an animal cell ?

  • nucleus, mitochondria, cell wall, cytoplasm
  • nucleus, cytoplasm, cell membrane, mitochondria, ribosomes
  • cell wall, nucleus, ribosomes, cytoplasm

8. What is an ion ?

  • An atom or molecule with an electric charge due to the loss or gain of one or more electron
  • An atom or molecule with no electric charge due to the loss or gain of one or more electron

9. What is an alloy ?

  • Is a mixture of two elements
  • Is one element
  • Is a mixture of three elements

10. How can you tell a chemical reaction is taking place ?

  • All of them
  • change in colour
  • Smell
  • Temperature