| A | B |
|---|
| Define physical properties | those characteristics that can be observed without changing the composition of the substance |
| Define chemical properties | the charactertistics that describe how a substance interacts with other substance to produce different kinds of matter |
| Define element | all matter is made up of elements |
| Define atom | the smalles unit of an element |
| Define electrons | carry a negative electrical charge; located outside the nucleus |
| Define protons | carry a positive charge; located inside the nucleus |
| neutrons | neutral - have no charge; located inside nucleus |
| What is the atomic number? | number of protons in an atom |
| What is an isotope? | atoms of the same element that differ from each other in in mass number |
| Three major physical forms of matter? | solid, liquid, and gas |
| Define compound | a new substance with properties different from those of the elements |
| Define molecule | the smallest complete unit of a compound |
| ionic bond? | when electrons are transferred from one atom to another |
| covalent bond? | bond based on the attraction between atoms that share electrons |
| What is a mixture? | material that contains two or moer substances that are not chemically combined |
| 3 examples of natural mixtures | rocks, soil and atmosphere |
| What is a solution? | a mixture in which one substance is uniformly dispersed in another substance |
| 3 examples of solutions | sea water, brass, bronze |
