Science Benchmark
The weight of an object is always equal to the sum of its parts, regardless of how it is assembled. In a chemical reaction or physical change matter is neither created nor destroyed. When two or more materials are combined, either a chemical reaction or physical change may occur. Chemical reactions are often indicated when materials give off heat or cool as they take in heat, give off light, give off gas, or change colors. In a chemical reaction, materials are changed into new substances. In a physical change a new substance is not formed.
5th graders are expected to know and understand what is involved in chemical and physical reactions. We have had a guest speaker, Ms. Cherry, from The Children's Museum, and done several experiments with chemicals and everyday objects.
Watch the following video then comment on this blog post. At least 5 sentences are required to complete the post. Watch spelling and punctuation please.
http://www.visuallearningsys.com/subscription/elementary/investigating_chemical_reactions
- What are 4 indicators of a chemical reaction?
- How do you know if popping popcorn is a chemical reaction or physical change?
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