1. Mixtures and Solutions
Review

2. Separating Mixtures
A __________ combines two or more materials without changing them.
mixture
A __________ forms when a material dissolves in a liquid and cannot be separated with a filter.
solution

3. Separating Mixtures Vocabulary
A substance that dissolves in water.
Solute
A substance that dissolves a solute.
Solvent
The process of one material disperses uniformly into another.
Dissolving
Capable of being dissolved.
Soluble

4. Separating Mixtures How can mixtures be separated?
Using filters or screens. In class we used filters and screens to separate powder and pebbles.
How can solutions be separated?
Evaporation: When water turns into a gas and appears to disappear it leaves behind the dissolved solid in the form of crystals.

5. Reaching Saturation A solution is saturated when ...
As much solid material as possible has dissolved in the liquid.
In class we dissolved salt and citric acid in water. Which one is the most soluble?
Citric acid because grams dissolves campared to grams for salt.

6. Concentration The amount of substance in a mixture is …
- its concentration
The more material dissolved in a liquid the more or less concentrated it is.
MORE
You must compare equal volumes of two liquids to see which one is more concentrated.
What can you do to dilute a solution?
Add more liquid

7. Which is more concentrated?
Solution 1: 50 ml of water and 2 spoons of salt.
Solution 2: 150 ml of water and 5 spoons of salt.
Solution 3: 200 ml of water and 8 spoons of salt.
Answer: Solution 1 and 3 have the same concentration. Solution 2 is less concentrated.

8. Fizz Quiz
When a change results from mixing two or more materials, that change is called a …
Chemical reaction
How do you know a chemical reaction has taken place?
Change in temperature
Gas formation
A precipitate is form (A new material)