Evaluation of Topic 7revised 2011
Name
________________________Class_________Date________________
1. I know that metal elements and graphite conduct electricity and most
non-metals are insulators
2. I know that covalent compounds do not conduct electricity in any state.
3. I know that ionic compounds do not conduct electricity when solid
and ionic compounds conduct electricity only dissolved in water in molten state.
4. I know that electrons flow through metals and graphite whilst ions
flow through solutions and molten compounds
6. I know that electrical energy chemically changes a solution if it conducts.
7. I can describe the formation of ions as the atoms gain or lose electrons.
8. I know that solid compounds can be covalent or ionic but compounds that are
liquids or gases at room temperature are covalent.
9. I know that ionic solids exist as networks / lattices of oppositely charged ions.
10. I know that covalent compounds dissolve in covalent solvents and ionic
compounds dissolve in water,(like dissolves like)
12. I know that an ionic compound is broken down by an electric current in a
solution or when molten when the ions are free to move, (electrolysis)
13 I know opposite charges attract and ions change into atoms at the electrodes
14. I can explain why molten ionic compounds conduct due to ions being able to
move whilst in solid ionic compounds ions cannot move and don't are insulators
15. I know what is meant by an electrolyte and electrolysis.
16 I can state the colour of a compound is due to the type ions in it
17. I can explain the results of experiments involving the movement of
coloured ions.
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In addition at Credit Level
1. I know that a direct current (d.c.) must be used during
electrolysis.
2. I can explain why ionic and covalent network substances
are solid whilst covalent molecular substances can be solid,
liquid or gas.
3. I can explain the formation of atoms / molecules at each
electrode in electrolysis in terms of positive ions gaining
electrons and negative ions losing electrons.
4 . I can explain why only ionic melts or solutions containing
ions can be electrolysed.
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on anything you enjoyed or found really difficult
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