sand and water - no , the sand completely stayed in the bottom
salt and vinegar - yes , when they mix they dissolve the copper-oxide layer, they make it easier for the copper atoms to join oxygen from the air and chlorine from the salt to make a blue-green compound called malachite.
flour and cooking oil - no , they can't be mixed because they are immiscible.
pepper and vinegar - no , pepper will not melt because it is super hot.
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Answer:
sand and water - no, the water turns brown
salt and vinegar - yes.
flour and cooking oil - no.
pepper ang vinegar - no.