Q: Silver and ordinary table salt are two examples of chemical what?


Read this paragraph and choose the correct option from the provided answers:

Silver and ordinary table salt are two examples of chemical substances . A substance is matter that has a uniform and definite composition. All samples of substances, sometimes called pure substances, have identical properties. When chemists run a chemical reaction, they want to use pure materials so they know exactly what they are dealing with. They know that the reaction involves a specific substance, so they expect the same reaction to give the same results each time it is run.

 Choices:

- organism

- impurities

- microbes

- substances


A:
substances