Question

1. which of these is an example of a mixture? mark all that apply sodium chloride (nacl) oxygen gas (o₂) salt water carbon dioxide (co₂)

Explanation:

A mixture is a combination of two or more substances where the substances retain their own chemical identities. Sodium chloride ($NaCl$) is a compound formed by chemical bonding. Oxygen gas ($O_2$) is an element - a pure substance. Carbon dioxide ($CO_2$) is a compound. Salt water is a mixture of salt (sodium chloride) and water, where the salt and water are physically combined and can be separated by physical means like evaporation.

Answer:

Salt water