1. Today’s Agenda…10/6
Bellringer: What group of elements are unreactive? What does this mean?
Get your clickers!
Compounds and Mixtures
1 day until
fall break!

2. What do you think? True or False (Review questions)
Elements cannot be broken into simpler substances.
Compounds are made up of two or more atoms of the same element.
Water is an example of a compound.
Salt is an example of an element.

3. What do you think? True or False (Preview Questions)
Mixtures cannot be separated.
A physical change occurs when compounds are formed.
The elements in a compound keep their original properties.
You can see all the parts in a homogeneous mixture.

4. Compounds vs. Mixtures
Compounds and Mixtures are not the same type of substance!
Today we will investigate the difference between these two substances.
We will investigate…
Their composition
How they are joined
Their properties
If and how they can be separated
Examples

5. Composition Mixture Compound Varies
You can change the amount of each substance in a mixture
Compound
Definite
You cannot change the amount of each element in a compound

6. Joined Mixture Compound
A physical change occurs when substance come together
The substances are NOT chemically joined together
Compound
A chemical change occurs when substance come together
The substances are chemically joined together

7. Separation Mixture Compound
Each substance is easily separated from the mixture
Sorting, sifting, filtering, evaporation
Compound
Can only be separated into elements using chemical reactions

8. Properties Mixture Compound Each substance keeps its own properties
The compound has different properties than the elements it contains

9. Examples Mixture Compound Air Salt water Soup Water Salt
Carbon dioxide

10. Chex Mix vs. Salt Water What is the difference?
Which one is easier to separate?
Chex mix is a heterogeneous mixture while salt water is a homogenous mixture or solution

11. Homogeneous vs. Heterogenous
Homogeneous mixture - “the same throughout”, meaning you cannot see the different parts in the mixture, like salt water or air
Heterogeneous mixture – you can see the different parts in the mixture, like pizza and vegetable soup

12. What did you learn? True or False Mixtures cannot be separated.
A physical change occurs when compounds are formed.
The elements in a compound keep their original properties.
You can see all the parts in a homogeneous mixture.