Question

select all the mixtures.
cracker
carbon dioxide
ketchup
chocolate bar

Explanation:

A mixture is a combination of two or more substances that are not chemically combined. A cracker contains flour, salt, and other ingredients mixed together. Ketchup is a mixture of tomatoes, vinegar, sugar, and spices. A chocolate - bar has cocoa, sugar, and milk solids mixed. Carbon dioxide is a pure compound, not a mixture.

Answer:

cracker, ketchup, chocolate bar