SC.4.P.8.3 Explore the Law of Conservation of Mass by demonstrating that the mass of a whole object is always the same as the sum of the masses of its parts.

VOCABreactant- a substance used in a chemical reaction



CHEMICAL CHANGES
Many of us know about chemical changes, but there is much more to it. Chemical changes are when an object changes its chemical make-up. For example burning wood, fireworks exploding and nails rusting are all chemical changes because the make-up is different and you can't change it back.

The Law of Conservation of Mass

But if you light a candle, it will shrink to about1/4 of its size in around an hour. As you know, candles give off thermal energy, light energy and gasses when they are burning. If you put the candle in a closed container and lit it, the candle would melt and release gasses into the rest of the container. It will look like the candle has lost mass, but the mass of the gasses would equal the mass of the missing part of the candle. This is called the law of conservation of mass. This law states thay when an object undergoes a chemical change, the mass of the gasses released will equal the mass of the missing portion. In other words, the mass of the reactants combined must equal the mass of the product. Another example of the law of conservation of mass is when you bake a cake, the gasses and beautiful smelling fumes that rise up out of the oven are masses that that have been removed from the batter.

Resourcesscimishmash.jpg

☺Mrs. Adams

☻ Redbook pgs. 379

http://www.brainpop.com/science/matterandchemistry/conservationofmass/