1. Mixtures…
In a mixture, different things are combined without being chemically joined.
When two things join chemically, their atoms combine in new ways.
A salad is a mixture.

2. When you mix the different vegetables together, they do not change into something else.
A tomato is still a tomato and a carrot is still a carrot.

3. So… a salad is a mixture!

4. Lemonade is another mixture.

5. Lemonade It is sweet like sugar. It is sour like lemons
It is wet like water.

6. HOW? But can you take lemonade apart?
The parts of lemonade are very small. It would be hard, but you could take them apart.
HOW?

7. To separate the parts of a mixture, you must rely on the different properties of each part.
Suppose you have a mixture of salt, pepper and iron filings.

8. SO… how can you separate it?
Each material has different properties.
Iron is magnetic.
Salt dissolves.
Pepper floats.
SO… how can you separate it?

9. Which does NOT occur in a mixture?
Atoms join in new ways
Parts get mixed up.
ALL properties stay the same.

10. Salt dissolves in water J. Pepper dissolves in water.
Which property can be used to
separate a mixture of salt and pepper?
Salt is magnetic.
Pepper is magnetic
Salt dissolves in water
J. Pepper dissolves in water.

11. Add water and let the small rocks float to the top.
The owner of a rock quarry needs a way to
separate different size pieces of rock.
Which of the following methods could he use?
Add water and let the small rocks
float to the top.
Use a magnet to pull out the small
rocks.
C. Sift the rocks through screens with
different size holes.
Add water and let the larger rocks
dissolve.

12. Why does lemonade keep the physical properties of its ingredients?
F. It is wet like water
It is sour like lemons.
It is sweet like sugar.
J. It is a mixture.

13. Which mixture is easiest to separate using only hands?
Peas and carrots
Lemonade
Salt and sugar
Iron filings and pepper

14. The cake is sweet like sugar. The cake is dark like chocolate.
Which clue suggests that a cake is not a mixture?
The cake is sweet like sugar.
The cake is dark like chocolate.
The cake can be separated into its ingredients.
J. The cake cannot be separated into its ingredients.