Chemistry, Earth History, Infectious Diseases, Lithosphere
Chemistry 8.P.1- Understand the properties of matter and changes that occur when matter interacts in an open and closed container.
Physical Property- A characteristic that you can observe without changing the composition of the substance. Ex.- odor, mass, density, state, volume, color.
Chemical Property- A characteristic that you can only observe by changing the identity of the substance. Ex.- flammability, re-activity
Physical and Chemical Change
Physical Change- Any change that does not involve a change in the substance's chemical identity.
Chemical Change- Any change in matter that results in the formation of new chemical substance.
Elements, Compounds, and Mixtures
Elements- Building blocks of matter made of atoms.
Compounds- Substance formed when 2 or more elements chemically combine.
Mixtures- Combination of 2 or more different substances that are mixed but not combined.
Periodic Table- A list of all known elements, increasing by atomic number.
Groups- Columns (up and down) of elements on the periodic table that share common properties.
Periods- The periodic table has seven horizontal (left to right) rows
Metals- Solid, shiny, good conductors of electricity and heat, and can be made into wires.
Non-Metals- Brittle, not good conductors of both heat and electricity, and can gain electrons in chemical reactions. Some nonmetals are liquid.
Metalloids- Have properties that are somewhat of a cross between metals and non metals, because of their unique conductivity properties, they can be used as a semiconductor or in computer chip.
Atomic Number- The number of protons in the atoms nucleus
Atomic Mass- The mass of an atom
Protons- A particle of a positive electric charge in an atom
Electrons- A particle of a negative electric charge in an atom
Neutron- Same mass as a proton but without the electric charge
Law of Conservation of Mass
Law of .....- States that matter cannot be created or destroyed ; it can only be transferred from state to state.