Chemistry Unit 1

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1. How do you work out the rate of a reaction?

  • change in volume or mass divided by change in time
  • change in time divided by change in volume or mass
  • change in temperature multiplied by volume
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2. What is an Isotope?

  • Isotopes are atoms with the same chemical formula but different chemical structure
  • Isotopes are atoms with

3. If the Mass number of sodium is 23 and the atomic number is 11, how many neutrons are there?

  • 12
  • 34
  • 13
  • 18

4. Is an atom neutral? True or False

  • True
  • False

5. Why is there an equal amount of protons and electrons?

  • because atoms are neutral so it must have an equal amount of each other so they cancel out the charges
  • Because the protons are negative and so are the electrons


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