Red litmus paper turns into blue in the presence of a/an _________________.

Which of the following is a mixture?

Which of the following is an element?

Coffee, mouthwash, and vinegar are examples of __________________ mixtures.

Is this a heterogeneous or homogeneous mixture?

In a ______________, one substance is dissolved in another substance.

Blue litmus paper turns red in the presence of a/an _______________.

A _________________ mixture is one where the substances are evenly spread throughout.

A ______________ mixture is one that does not have a uniform composition.

Elements are classified as metals, nonmetals, or _________________.

A/An_______________ is made up of one or more of the same kind of atom chemically combined.

Which of the following is represented by the picture?

Which of the following is a pure substance?

Physical changes such as melting, freezing, cutting, or smashing do not change the identity of pure substances.