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The starting materials completely lose their properties to form new substances chemical change 2. a change from one state of

the starting materials completely lose their properties to form new substances chemical change 2. a change from one state of matter to another physical change 3. a change in shape, size, or physical characteristics but remaining same substance Law of Constant Composition 4. a pure compound consists of exactly the same elements in the exact same ratios by mass molecule 5. The smallest unit of a compound phase change

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