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

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

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

A __________________ is a substance that has a fixed composition and definite properties such as appearance, melting point, and reactivity.

Fruit Loops, pizza, and Skittles are examples of ____________________ mixtures.

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

Which of these is a mixture?

Air is:

Dry ice is solid carbon dioxide, or CO2. Dry ice may be used as a cooling agent and contains two oxygen atoms bonded to a carbon atom. Dry ice is a ___________________ .

Instant coffee is made by dissolving a powder in hot water. Instant coffee is a ___________________ .

Baking soda is the common name for sodium bicarbonate, or NaHCO3. It can be produced through chemical reactions involving carbon dioxide and sodium hydroxide.

Cake batter is a substance that may contain flour, eggs and sugars mixed by hand or with an electric mixer. Cake batter is a ___________________ .

Blood is a fluid found in the bodies of humans and other animals. It can be physically separated into plasma, red blood cells and white blood cells. Blood is a ___________________

Methane contains one atom of carbon and four atoms of hydrogen that are chemically bonded. It is a main component of natural gas. Methane is a ___________________ .

Nickel has the chemical symbol Ni and atomic number 28. It is a silvery-white metal and cannot be broken down physically or chemically into a more simple substance. Nickel is a ___________________ .

Ammonia is a colorless gas with the formula NH3. Ammonia contains hydrogen and nitrogen and cannot be broken down physically. Ammonia is a ___________________ .

The noble gases are a group of six substances with similar properties. They are odorless, colorless gases with low reactivity. They are group 18 on the periodic table. Each noble gas is a(n) _______ .

Granite is an igneous rock that contains the minerals quartz, feldspar, mica and others. The exact composition will vary from sample to sample. Granite is a(n) _______ .

Chex mix contains pretzels, rye chips and chex cereal. It is an example of a(n)

Air is:

Which of the following is classified as a pure substance?

Which of the following materials should be classified as a mixture?

Which is an example of a container filled with a pure substance?

Which is a mixture of compounds?

Which is a pure substance?

Why are elements and compounds called pure substances?

Only one of the following substances is a pure substance. Which one?

A substance can be represented by a formula; for instance  $H_{2_{ }}O$  . Then, it is a...

Which of the following is not a pure substance?

Which of the following is a pure substance?