E-C-M Review

1 - If you can see different substances in a mixture, it is a ---- mixture.

• homogeneous
• heterogeneous
• colloid
• alloy

2 - ---- contain only one type of atom.

• elements
• compounds
• mixtures

3 - Compounds contain atoms of two or more DIFFERENT elements bonded together in a specific -----.

• shape
• ratio
• matter

4 - Mixtures can be separated physically --------

• because they are not bonded together chemically
• unless they have very large particles
• if they are homogeneous

5 - Air, salad and pizza are examples of ------

• elements
• compounds
• mixtures

6 - Sodium (Na) and Oxygen (O) are examples of

• elements
• compounds
• mixtures

7 - Another name for a homogeneous mixture is ----

• a compound
• a solution
• a combination

8 - A chemical formula is like the recipe to make a/an

• element
• compound
• mixture

9 - A pure substance can be -----

• an element only
• an element or compound
• an element, an atom, a molecule or a compound

10 - Heterogeneous mixtures----

• have the same composition throughout (are uniform)
• have varying / different compositions throughout (are non-uniform)
• are the same thing as solutions