1. Warm Up 8-21-17 1. Convert 19 g to kg 2. Convert 7.4 m to cm
3. Which is larger: 658 cm or 658 km?
4. How much volume are in these graduated cylinders
Agenda
Go over Safety Quiz
Notes Unit 1-4
Turn in Lab Mass & Volume
Start Online HW Unit 1
Homework
Aug 29 - Notebook check Unit 1
Aug 29 - Test Unit 1
Aug 30 - Online HW Unit 1

3. Safety Quiz
Glassware that been heated and glassware at room temperature look the same
a. True
b. False
A safe technique to smelling chemicals is ________

4. Unit 1-4 How is Matter Classified?

5. How is Matter Classified?
What does it mean to classify information?
Why is it important to classify information?
Classify so that we can easily find things
Example is making folders in the computer for organization purposes

6. Classifying Activity Make your own group of 4-5 and sort the cards
Discuss these questions:
1) How many groups did you make?
2) How many groups of mixtures?
3) What’s the difference between the mixtures?
4) What’s the difference between elements and molecules?
5) What’s the difference between molecules and compounds?

7. Pure Substances Pure substance
One type of element or a single compound, that has definite chemical and physical properties
Examples include copper, oxygen, and carbon dioxide
Elements, molecules or compounds
One type of thing - all shirts in a drawer, pants ect…

8. Pure Substances 1) Elements
Pure substances that contain only one type of atom (e.g. He, Li)
Diatomic gasses (H2, O2, N2, Cl2 etc…)
Some elements are diatomic (they are never found naturally by themselves. They have a “buddy”)
H2, O2, N2, Cl2, Br2, I2, F2
Each element has its own chemical symbol on the periodic table
e.g. = Exempli gratia i.e. = that is

9. Pure Substances 2) Compounds
A substance made up of two or more different elements joined by chemical bonds (e.g. CO2)
All compounds are molecules
Compounds can be made from their elements and also broken down into their components

10. Pure Substances 3) Molecules two or more atoms
diatomic gasses (H2, O2, N2 etc…)
A compound: H2O, NaCl
A molecule is the smallest unit of a substance that keeps all the physical and chemical properties of that substance
It can consist of one atom or two or more atoms bonded together
Example: Helium versus Hydrogen

11. Pure Substances
Element
Molecule
Compound or Molecule
Mixture

12. Mixtures
Mixture - A combination of two or more substances that are NOT chemically combined
Example: air is a mixture of nitrogen, oxygen, argon, and carbon dioxide
Example: pure water is NOT a mixture because H is chemically bonded to O to form H2O
The proportion of the materials in a mixture can change
Chipotle bowl or burrito is an example of a mixture (not chemically combined)

13. Mixtures 1) Homogeneous mixtures
When pure substances are distributed evenly throughout the mixture
The different components of the mixture cannot be identified by looking at it
Examples: air, gasoline, syrup
Homo - prefix from latin, Greek prefix = man Air is a mixture (78% nitrogen and 21% oxygen)

14. Mixtures 2) Heterogeneous mixtures
When pure substances are NOT evenly distributed throughout the mixture
You can see the different
components in the mixture
Example: ice tea, cereal
Check in - what kind of mixture is air? How about ice tea?

15. Check in
Cereal and milk?
Coffee and sugar?

16. Assignments
Summary today’s – What’s the difference between pure substance and mixture?
Online homework unit #1
Finish lab volume and turn it in today
Summary Last class’ - why is it important to include units in your measurement?

17. Mixture Vs. Compound Review
A compound is composed of two or more elements chemically joined
Properties of compounds have different properties than the elements that make them up
Compounds have definite proportions
Compounds can only be separated into its components through chemical change
A mixture is composed of two or more substances that are physically mixed
Properties of mixtures reflect the substances it contains
Mixtures can have varying proportions
Mixtures can be separated based on the physical properties of the substances