Unit 2 lesson 4

chemical change

the starting materials completely lose their properties to form new substances

electrolysis

The process of passing electricity through water to chemically separate it into hydrogen and oxygen is called what?

molecule

The smallest unit of a compound

True

The various components of a mixture do not combine chemically.(T/F)

True

Unknown compounds can usually be identified based solely on their physical properties. (T/F)

phase change

a change from one state of matter to another

physical change

a change in shape, size, or physical characteristics but remaining same substance

Law of Constant Composition

a pure compound consists of exactly the same elements in the exact same ratios by mass

True

Iron filings can be separated from a mixture with sulfur by using a magnet. (T/F)