Physical and Chemical properties of matter
1. What is matter?
has both mass and volume
more about matterthe building blocks of matter are atoms
- electrons
- protons
- neutrons
2. All substances have definite properties,
A. Physical properties / physical change - "things it can do alone"definition - A quality or condition of a substance that can be observed or measured without changing the substance's condition.some examples:
- state at room temperature
- melting point
- freezing point
- color
- density /specific gravity
- specific heat
- polarity
- solubility
- conductivity
- magnetic
- malleability
Substances that are combined without reacting are called mixtures, to learn more about mixtures.
Substances that react to one another and chemically bond are called elements or compounds.
B. Chemical properties / chemical change - "it takes two to tango"
definition - How a substance reacts to other substances. When one or more substances react they become a third, unique, substance often with new physical and chemical properties.some examples:
- oxidation - rusting or burning
- flammability
in a chemical reaction there are reactants and products, these occur in definate proportions.
chemical reactions are predictable and repeatable
there are also definate clues that a reaction has taken place including:
- change in physical properties
- color change
- gas given off
- temperature change
Law of conservation of matter / mass
Matter can never be created nor destroyed. All matter that is present before a chemical reaction occurs is also present after the reaction, although it may be in a new compound.
3. Once we understand these basics we can proceed to how and why there are so many unique substances and compounds in our lives.
to learn more about reactionsto learn more about compounds
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