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Chemistry
Question | Answer |
---|---|
An indicator is a chemical which: | changes colour in acids and alkalis. |
The PH scale is used to: | describe how strong an acid or basic substance is. |
Define Soluble: | Can be dissolved |
Define Insoluble: | Can't be dissolved |
All nitrates are: | Soluble |
All sodium and potassium compounds are: | Soluble |
All Chlorides are: | Soluble |
Silver, calcium, barium and lead sulfate are: | Insoluble |
All carbonates are: | Insoluble |
Metal reacts with oxygen forming: | metal oxide (corrosion) |
what can metal oxide do to an metallic element: | eat it away |
what is stainless steel: | an alloy |
can stainless steel rust?: | no |
what can steel be protected by to prevent rusting?: | oil,paint or plastic |
if a steel object is scratched what will happen?: | it will rust |
what is decomposing?: | the rotting of a plant or animals caused by Bactria and air |