What's Your Sign?

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Recommended: Chemical reactions 8th grade

What’s Your Sign?
Use your knowledge about the four signs of a chemical reaction to identify the chemical change in the following examples. What sign is observed and what is the new substance formed? Choose one of the examples below. The sign(s) of a chemical reaction should be identified along with the new substances formed if possible. Use the Internet to do further research if necessary. A water purification plant needs to remove an excess of lead and mercury from a stream of water before it can be sent into the city reservoir. The addition of ground up clam and mussel shells (calcium carbonate) to the water results in a black solid (lead or mercury carbonate) being formed in the water that can be filtered and removed from the liquid.

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