Classify each substance as either a mixture or a pure substance.
chlorine
water
air
brass
coffee
olive oil
copper

Mixtures :

* air

* brass

* coffee

* olive oil

Pure substances :

* chlorine

* water

* copper

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oh it is true if thats what you are asking

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)