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

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

Which of these is a mixture?

Air is:

What is this?

What is this?

What is this?

What is this?

What is it?

What is it?

What is it?

What is it?

What is it?

What is it?

What is it?

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?

Oxygen

Salt(NaCl)

Saltwater

Sand

Air

Chicken noodle soup

Vinegar (Acetic Acid and Water)

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

A bottle of dishwashing detergent contains a clear, viscous liquid. The label has a long list of ingredients, including water, sodium lauryl sulfate, fragrance, and Blue dye #5.

What can you infer about the material in the bottle from this label and the appearance of the liquid?

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

Which is a mixture of compounds?

Which is a pure substance?

Classify this substance?

Why are elements and compounds called pure substances?

What type of substance is tap water?

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

What type of substance is an alloy, for instance, bronze?

Is a golden ingot a pure substance?

bronze, steel and stainless steel have something in common...

Classify this gold ingot?

What type of substance is an alloy, for instance, bronze?

What type of substance is bleach? Hint: It is a substance ( NaClO) dissolved in water.

What type of substance is vinegar? Hint: It is a substance (acetic acid) dissolved in water.

The picture shows sulphur and iron filings. We can distinguish both substances. So we say it is...

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

A substance is made up of atoms of one element; for instance ozone is made up of atoms of oxygen (only oxygen). Then, ozone is a...

Which of the following is not a pure substance?

Which of the following is a pure substance?

What type of substance does the model represent?