Teacher Page III. Matter and Energy A. Properties, Characteristics, and Structure of Matter State Standards 1.3; 1.6; 2.4 7th grade assessment Students.

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Presentation transcript:

Teacher Page III. Matter and Energy A. Properties, Characteristics, and Structure of Matter State Standards 1.3; 1.6; 2.4 7th grade assessment Students should know in a closed system, matter is conserved during any physical or chemical change. View lesson before using with students. Sample questions and answers appear with mouse click or automatically.

How can things change and still stay the same? A physical change. A change in size, shape, or state without forming a new substance. When heat turns a solid into a liquid or a liquid into a gas.

How do things change identity? A chemical change. New substances are produced with physical properties different from the starting substances. A color change may occur, heat and light may be given off, a gas may be produced.

What happens to mass in chemical changes? Silver tarnishes candles burn milk sours toast browns battery acid eats away cloth steel rust The mass of matter does not change during chemical changes. The total mass of all starting substances equals the total mass of all new substances.

When a candle burns, some of the wax melts and runs down the side. Is this a chemical change or a physical change? Why? Does the candle change in size or shape? Does the candle become a new substance? Physical Change

Is lighting a match a chemical change or a physical change? Why? Is a new substance produced? Does a color change occur? Is heat and light given off? Is a gas produced? Chemical Change