1. Define 'simple molecular covalent compounds'
- Small molecules consisting of only non-metallic atoms
- Large molecules consisting of only non-metallic atoms
- Small molecules consisting of only metallic atoms
- Large molecules consisting of only metallic atoms
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2. How do you test for chloride ions?
- Dip a nichrome wire in acid and dip it in the substance, put it in a bunsen burner and the flame will turn blue if chloride ions are present.
- Add water sterilising tablets. If it turns cloudy, chloride ions were present, as chlorine is present in a swimming pool.
- Add silver nitrate, if a precipitate forms it contains chloride ions.
- Bubble it through limewater - if a blue precipitate is formed it contains chloride ions.
3. Chemical structure of metals
- An irregular arrangement of positive metal ions
- An irregular arrangement of negative metal ions surrounded by a sea of delocalised electrons
- A regular arrangement of positive metal ions surrounded by a sea of delocalised electrons
- A regular arrangement of negative metal ions
4. Why are metals able to conduct electricity?
- Because the neutrons are delocalised and can move when a voltage is applied
- Because they're soluble in water
- Because the delocalised electrons can move when a voltage is applied
- Because the protons are able to move
5. How do scientists use chromatography to identify colourless substances like amino acids and sugars>
- Spraying the paper with a locating reagent which reacts with the invisible spots to produce a colour
- Filtering it and seeing which colours are left
- Spraying the paper with universal indicator so the colourless substances change colour
- Setting it on fire with a bunsen burner