#1
Heterogenous mixture mean unsimilar substances .
- Chicken noodle soyp.
- salt water
- propane.
#2
An element is a substance made of only one type of atoms
When a substance goes from being a liquid to a gas it evaporates, or boils away. Think of boiled eggs.
A homogenous mixture is uniform and thus hard to recognize as a mixture. An example is water.
Answer: Air
Explanation: Pure air is a mixture of several gases that are invisible and odorless. Consists of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide.