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W5.5 LOOKING FOR PATTERNS (5)
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Here is a puzzle. Watch the video and then try to answer the questions:

Think for Yourself...

How can you tell that not all the acid was used up by the lumps of calcium carbonate?
Why did the fizzing stop when there were still lumps of calcium carbonate left if there was still plenty of acid to react with?

Notes: see Teachers’ Guide


End of section 6.
 
teachers’ guide w7


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w1: acids
w2: hydrochloric
w3: sulfuric
w4: nitric
w5: patterns


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