| A | B |
|---|
| pure substance | either an element or compound : something that is in a fixed proportion:ex. silver, salt |
| element | substance which can't be broken down into simpler substances |
| atom | smallest particle of a substance |
| compound | substance that is made up of two or more simpler substances can't be broken down: NaCl=salt |
| mixture | salsa properties and composition vary |
| heterogenous mixture | parts of a mixture that a noticeably different from one another |
| homogenous mixture | mixtures where you can't see seperate substances; chlorine in water |
| solution | one substance dissolves into onother forms a homogenous looking substance: windshield wiper, air |
| suspension | heterogenous mixture that separates over time: sand and water |
| colloid | mixture that doesn't seperate over time: milk, fog |
| viscosity | tendancy of a fluid to resist flowing- honey, glue |
| physical properties | conductivity,malleable,hardness,melting and boiling, density |
| chemical properties | observed when substances change into different substances: flammability and reactivity |
| filtration | physical separation- paper in funnel -sand collects |
| distillation | physical seperation involving heat to evaporate water- salt remains |
| butter melting and crumpling paper | examples of physical changes |
| gas released, paper burned | examples of chemical changes |
| flammability | materials ability to burn in presence of oxygen |
| reactivity | how quickly substances combine chemically in natureEx. Oxygen is highly reactive |
| chemical change | teo substances form a different substance Ex. match turns black, cheese from milk with lemon |
| precipitate | a solid that forms on the bottom of a test tube from a chemical change |
