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chemical reactions paper 1

reaction of metals with oxygen?

metal + oxygen -> metal oxide

gaining oxygen?

oxidation

losing oxygen?

reduction reaction

metal reacting with water?

metal + water -> metal hydroxide + hydrogen

why do metals form positive ions?

because they lose electrons to get a full outer shell

what do acids produce in water?

hydrogen ions

what do bases produce in water?

hydroxide ions

how are bases and alkali different

bases are insoluble in water but alkali are soluble in water

what compound is a base usually

metal oxide or metal hydroxide

what is a neutralisation reaction + example

acid and alkali reacting to create a neutral solution
hydrogen ion + hydrooxide ion -> water

what does a metal + acid produce?

salt + hydrogen

what ending does a hydrochlorid scid salt have?

chloride

what name does a sulfuric acid salt end in?

sulfate

when reacting a metal with an acid what gets reduced and what gets oxidised

metal oxidised
acid reduced

what ending does a nitric acid salt have

nitrate

acid + metal carbonate?

salt + water + carbon dioxide

make a soluble salt? 5 steps

1. add a fixed amount of dilute sulfuric acid
2.add excess copper oxide and mix until its blue and powder is at the bottom

3.filter out powdered copper oxide with filter paper

4. add copper oxide to evaporating basin and heat until half the solution is left

5. leave for 24 hours to evaporate

what makes an acid strong?

fully ionises in water

what makes an acid weak?

partially ionises in water

what happens when the ph unit is decreased by one

hydrogen ions multiply by 10

titration practical? 7 steps

1. add 25cm(3) of sodium hydroxide into a conical flask with pipette
2.add 5 drops of indicator

3.place flask on white tile

4.fill a burette with sulfuric acid

5.add acid and start adding dropwise when colour starts to change

6.constantly swirl until solution is colourless

7.read volume in the burette from the bottom of the meniscus

what is the indicator used in titration

phenolphthalein

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