1. Earth Chemistry Chapter 4 Section 1 Matter
What’s the MATTER? Chemistry is the study of the properties of matter and how matter changes
Earth Chemistry
Chapter 4 Section 1
Matter

2. Matter Anything that has mass and takes up space.
It is the “stuff” around us.
List 3 examples of Matter.

3. Properties of Matter
Properties and changes of any type of matter depend on its make up.
A pure substance is a single kind of matter.
Meaning it has a specific set of properties.
Which is pure? salt or blueberry muffins

4. Every form of matter has two kinds of properties
physical
and
chemical.

5. Look at the rock being passed around:
Write a list of physical properties
Write a list of chemical properties

6. Physical Properties Things that describe an object are physical.
Physical properties can be observed and measured without changing the identity of the matter.
Examples include: color, hardness, freezing & boiling point, state (solid/liquid/gas), solubility, density, ability to conduct electric current etc.

7. Chemical Properties
Chemical properties describe a substance based on its ability to change into a new substance with different properties.
Example: wood burns to form ash and smoke
Requires basic knowledge about particles and the substances they make up
Not as easy to observe
Examples of chemical properties: flammability and reactivity

8. Q: What is matter made up of?
A: elements
Each element can be identified by its specific physical and chemical properties.
Element - a pure substance that cannot be broken down into any other substances by chemical or physical means.
This is the simplest SUBSTANCE.

9. More than 90 elements naturally occur on Earth.
8 make up more than 98% of Earth’s crust

10. Elements consist of ATOMS
An atom is the smallest unit of an element.
same chemical and physical properties

11. THINK & REFLECT Draw a picture of an atom.
What do you remember from last year?
What are the parts of an atom?
These parts are called subatomic particles. Can you tell me anything about them?

13. Parts of the Atom Subatomic Particle Location Charge Mass (AMU) Proton
nucleus +
1 amu
Neutron
No charge
Electron
Electron cloud -

14. Atomic Structure
The Nucleus – a small region in the center of the atom composed, usually, of protons and neutrons.
Has a positive charge
Makes up most of the atom’s mass
Protons = 1 amu (atomic mass unit)

15. The Electron Cloud
Electrons of an atom move in a certain region of space called the electron cloud.
Since opposite charges attract, the negatively charged electrons stay around the positively charged nucleus

16. Atomic Number and Atomic Mass

17. Class Work & Homework
Atomic Basics Worksheet