Science Unit 1 Test 3 Physical & Chemical Changes Tools A B chemical change a change in matter in which one or more different kinds of matter form physical change a change in the size, shape, or state of matter molecule the smallest particle into which a substance can be divided without changing the substance into something new compound substance produced when 2 or more elements are combined chemically mixture substance produced when 2 or more elements are blended without combining chemically physical The same kind of matter is present both before and after a ___ change. chemical Fireworks on the Fourth of July are an example of a ___ change. chemical To identify a ___ change look for observable signs such as color change, bubbling and fizzing, light production, smoke, and the presence of heat. vapor Water as a gas is invisible and is called water ___. physical Using the eraser on your pencil is an example of a ___ change. physical When you cut a potato to make French fries, you are causing a ___ change. physical Tearing a piece of paper into small pieces produces a ___ change. mixture Lemonade is a ___ of lemon juice, water, and sugar. shaving cream ___ is a mixture of a liquid and a gas. soda ___ is a mixture of water and CO2 gas. change When a chemical change takes place, the temperature will usually ___. chemical During a thunderstorm, lightning causes a ___ change in the air. rust The ___ on the body of a car or bike forms from a slow chemical change. chemical The burning of a candle causes a ___ change. chemical Another ___ change is wood burning. compounds ___ are the result of a chemical change. glass ___ is a compound of silicon and oxygen. don't always Compounds ___ look like the original elements involved in the chemical reaction. table salt Green chlorine gas and the silvery metal sodium combine to form ___. table salt NaCl water H2O carbon dioxide CO2 ammonia NH3 gasoline C8H18