| Question |
Answer |
| element |
a pure substance that cannot be broken down by any means; examples include carbon, oxygen, hydrogen |
| matter |
anything that has mass and volume |
| compound |
two or more elements chemically combined |
| physical property |
a characteristic that can be observed without changing what the substance is made of. Ex. The bread is soft. |
| chemical property |
a characteristic that you observe when a substance REACTS with another substance. Ex. Silver reacts with oxygen (tarnishes). |
| physical changes |
a change that alters the appearance of a substance, but does not affect what it is made of. Ex. Dry ice sublimating. |
| chemical changes |
a change in matter that produces a new substance. Ex. Burning toast. |
| mass |
the amount of matter in an object |
| volume |
the amount of space an object takes up |
| density |
the amount of matter in a given space. d=mass divided by volume |
| precipitate |
a solid that forms as the result of a chemical reaction between two liquids |
| sublimation |
the phase change from a solid to a gas; dry ice does this |
| reactivity |
the rate at which a substance undergoes a chemical reaction |
| condensation |
the phase change that occurs when a gas cools down enough to change to a liquid; clouds are formed this way |
| vaporization |
phase change from a liquid to a gas; molecules speed up and move further apart |
| evaporation |
phase change from a liquid to a gas; occurs on the surface of a liquid |
| organic |
compounds that contain carbon; compounds that come from once living organisms |
| inorganic |
compounds that come from minerals; compounds that come from non-living material |
| periodic table |
a systematic way to organize elements according to common physical and chemical properties |
500 Words
