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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?
17. ionic compounds conduct electricity when theyre molten or dissolved
18. ionic compounds have high melting points
19. ionic compounds do not dissolve in water
20. what is covalent bonding
- when atoms dont have enough electrons
- when atoms share electrons
- when atoms donate electrons