Changes Unit gas - A substance that has no shape or volume; most have no color and cannot be seen
liquid - A substance that has no shape but has volume; it takes the shape of its container
matter - Anything that has weight and takes up space
property - Something about an object that helps tell what it is
solid - A substance that takes up space and has its own shape
states of matter - Three forms matter may take - solid, liquid, and gas
boiling point - The temperature at which a heated liquid turns into gas
condensation - The process by which water vapor cools and changes to a liquid
evaporation - The process by which a liquid becomes a gas
freezing - When a liquid changes to a solid because heat is removed from the liquid
freezing point - The temperature at which a liquid become a solid
humid - A weather condition when the air is saturated with moisture
melting - When a solid changes to a liquid because heat is added to the solid
melting point - The temperature at which a solid becomes a liquid
the water cycle - The process by which water moves through the ground, evaporates from earth into the air, forms clouds, and falls back to earth as rain or snow
water vapor - Water that has changed to gas
dissolve - To make or become part of a liquid mixture.
mixture - Two or more substances that can be separated from each other and retain their properties.
solution - A mixture formed when a substance dissolves in a liquid and cannot be filtered out; the properties of a mixture are the same throughout the liquid.
dissolvable - Able to be dissolved in a liquid.
filter - Any substance through which a liquid or gas is passed to remove suspended solids.
crystal - A solid substance with a regular geometric shape.
evaporation - The process through which a liquid such as water changes into a gas.
water vapor - The gas that forms when water evaporates.
chromatography - A process in which a liquid or gas "carries" a mixture along a special paper and separates it into its components.
separate - to put, bring, or force apart; to keep apart or divide, as by an intervening barrier or space.
chemical reaction - The activity that occurs when a substances encounter each other and form new substances, such as a gas or rust
indicators - clues
reaction - The activity that occurs when a substance either combines with another substance or breaks apart to produce new substances
chemical reaction - The activity that occurs when a substances encounter each other and form new substances, such as a gas or rust.
iron oxide - Rust; the result of a chemical reaction when irons combines with oxygen.