Forms, Nature of, Properties:
-Objects are made of one or more materials
-Objects have many observable properties including size, weight, shape, color, and ability to react with other substances.
-Properties can be measured using tools such as rulers, balances and thermometers
-Objects can be sorted by their properties
-Materials can exist in different states; solid, liquid and gas.
-Substances have characteristic properties such as density, boiling point and solubility.
-Mixtures of substances can be separated.
-Substances react chemically in characteristic ways to for new substances
-Compounds have properties that are different than the substances that made them
-Substances can be placed in groups if they react in similar ways
-Chemical elements do not break down in the laboratory
-There are 100 known elements that can form compounds.
-Compounds combine to for living and non-living things.
-The atom's nucleus is composed of protons and neutrons.
-Radioactive isotopes are unstable and undergo spontaneous nuclear reactions.
-Atoms interact with one another by transferring or sharing electrons.
-Electrons govern chemical properties.
-An element is a single type of atom
-The Periodic Chart is a consequence of the repeating pattern of outermost electrons
-Solids, liquids and gases differ in the distance and angles between molecules or atoms
-Carbon atoms can bond to one another in chains, rings and branching. Large molecules are essential to life.
-Chemical reactions can release or consume energy.
-Light can initiate many chemical reactions such as photosynthesis.