1. Chapter 2 Matter

2. What is matter? Matter – anything that has mass and occupies space.
Three phases of matter – gas, liquid, solid.

3. How can the creation of matter resemble an ecosystem?
Atoms – smallest particle that has properties of an element.
Elements – a substance that cannot be broken down into smaller substances
Compounds – a substance formed when two or more elements combine together.
Organism – Population – Community – Ecosystem.

4. What elements are found in the human body and on Earth?
Nickel 2.4%
Magnesium 12.7%
Sulfur 1.9%
Silicon 15.2%
Calcium1.1%
Iron 34.6%
Oxygen29.5%
Other elements 2.6%
Human Body
Oxygen 65%
Sodium 0.3%
Calcium 1.6%
Potassium 0.4%
Hydrogen 10.2%
Phosphorus 0.9%
Carbon 17.5%
Nitrogen 2.4%
Sulfur 0.2%
Other elements 1%

5. Molecules
The smallest unit of a substance that exhibits all of the properties characteristic of that substance.
O Cl C6H12O NaCl
Chemical formula: the number of chemical symbols and the number of atoms in the basic unit.

6. Pure substance or a mixture?
Any matter that has fixed composition and definite properties.
Examples: distilled water, sugar, salt, pepper, milk
Mixture
A combination of more than one pure substance.
Examples: chocolate milk, fruit punch, chocolate chip cookie.

7. Types of mixtures Homogeneous – same throughout
examples: soda, milk, Kool Aid
Heterogeneous – not uniformly mixed
examples: chicken noodle soup, crowd at a football game.
Miscible –
Immiscible –