| A | B |
|---|
| physical properties | characteristics that can be measured by senses |
| chemical properties | describes how matter changes when it reacts with other matter |
| substance | material that always has the same make-up |
| element | is a substance that cannot be broken down by simple means into any other substance |
| compund | substance made up of two or more elements that are chemically combined |
| mixture | is a combination of two or more substances |
| atom | smallest particle of an element that has the chemical properties of the element |
| chemical symbol | one or two letters that stand for the name of an element |
| periodic table | where elements are arranged by thier chemical properties |
| molcules | chemically linked atoms |
| chemical formula | group of symbols that shows the elements in a compound (h2O) |
| physical change | a change in the size, shape, or state of a material |
| chemical change | a change in which a new substance is formed (rust) |
| nucleus | central core of an atom that contains neutrons and protons |
| proton | a particle that has a positive electric charge |
| neutron | a particle that has no electric charge |
| electron | a particle that has a negative charge |
| atomic number | number of protons in an atom |
| polymer | an organic compound that contains a very long chain of carbon compounds |
| metals | high electrial and shiny |
| steel and brass | composed of a combination of elemental metals |
| sugar | C6H12O6 |
| water | H2O |
| helium | He |
| oxygen | O2 |
| nitrogen | N2 |
| carbon dioxide | CO2 |
| salt, sodium chloride | NaCl |
