Which item is a pure substance?

Responses

ocean water

ocean water

solid gold

solid gold

cake mix

cake mix

10 carat gold

1 answer

The item that is a pure substance from the given options is solid gold.

Pure substances have a uniform and definite composition, and solid gold (which is 24 carats or nearly pure gold) fits this definition. In contrast, ocean water, cake mix, and 10 carat gold (which contains other metals and impurities) are not pure substances.