1. Unit 2: Chemistry Lesson 2: Classifying Matter Essential Questions: 1
Unit 2: Chemistry Lesson 2: Classifying Matter Essential Questions: 1.) What is matter made of? 2.) What are two types of mixtures?

2. What is matter made of?
A substance that cannot be broken Element
down into any other substances by
chemical or physical means
Elements are the simplest substances
They are identified by physical and chemical properties
They are represented by one or two letter symbols

3. Each element has:
physical and chemical properties
one or two letter symbols

4. The basic particle from which Atom
all elements are made
All matter is made of atoms
It has a positively charged center, or nucleus, surrounded by a “cloud” of negative charge
Elements have different properties because
their atoms are different

5. Atom Positively charged nucleus and smaller particles
Cloud of negative charge

6. A force of attraction between Chemical bond
two atoms
A group of two or more atoms Molecules
held together by chemical bonds
The atoms can be atoms of the same element
or different elements

7. Water is a molecule made up of an oxygen atom chemically bonded to two hydrogen atoms.
Oxygen molecules are made up of two oxygen atoms chemically bonded.
Chemical bond

8. In Class Activity

9. A substance made of two or more Compound elements that are chemically
combined in a set ratio
This formula shows the elements Chemical Formula in the compound and the ratio of
atoms
The chemical formula for water is H2O. There are two hydrogen atoms and 1 oxygen atom in water.

10. When elements combine, they form compounds with properties different from those of the elements.
Chemistry Textbook page 11

11. What are the two types of mixtures?
Two or more substances that are Mixture
together in the same place,
but their atoms are not chemically bonded
Each substance in a mixture keeps its own properties
The parts can be separated
A salad is a mixture. It includes lettuce, carrots, tomatoes, onions and croutons. You can separate the items.

12. In this mixture, you can usually see Heterogeneous
the different parts and they
can be separated
In this mixture, the substances Homogeneous
are so evenly mixed that you
can’t see the different parts

13. Mixtures
Which of these foods are heterogeneous and which are homogeneous?

14. How can you separate a mixture?