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6. what is nuclear fusion

  • when 2 small nuclei combine under high temp to make one larger nucleus
  • when a nucleus is broken down
  • when a nucleus explodes and gives off radiation

7. what is one mole

  • 6.63*10^-34
  • 6.02*10^23
  • 6.02*10^-23

8. how do you work out the number of moles from atoms or molecules

  • mass of substance/molar mass
  • number of particles/ avogadro constant
  • relative atomic mass/ molar mass

9. how do you work out number of moles of something in a compound

  • mass * planks constant
  • mass of substance/molar mass
  • mass * avogadro constant

10. what is empirical formula

  • gives the smallest whole number ratio of atoms in a compound
  • the actual number of atoms in a molecule

11. what is the molecular formula

  • gives the actual numbers of atoms in a molecule
  • smallest whole number ratio of atoms in a compound

12. what are the characteristics of a absorption spectrum

  • coloured background, dark lines
  • dark background, coloured lines

13. what is a compound

  • when different elements join or bond together
  • another name for a atom
  • a large molecule

14. how are ions formed?

  • when an element becomes negative
  • when electrons are transferred from one atom to another
  • when the share electrons

15. what holds positive and negative ions together

  • electrostatic attraction
  • shared pair of electrons

16. sodium chloride and magnesium oxide are ionic compounds?

  • True
  • False

17. ionic compounds conduct electricity when theyre molten or dissolved

  • True
  • False

18. ionic compounds have high melting points

  • True
  • False

19. ionic compounds do not dissolve in water

  • False
  • True

20. what is covalent bonding

  • when atoms dont have enough electrons
  • when atoms share electrons
  • when atoms donate electrons