1) Certain popular antacids are dissolved in water (with much fizzing) and are t
ID: 547623 • Letter: 1
Question
1) Certain popular antacids are dissolved in water (with much fizzing) and are taken in the form of a solution. When the antacid and water are mixed, what kind of change occurs?
a. Physical
b. Chemical
c. Can’t tell from the information given
Explain your answer:
2. A sample of solid potassium chlorate is heated strongly for 30 minutes. The sample melts, and bubbles of gas escape during the heating. Upon cooling, the heated sample becomes solid. The solid is white in color before and after heating. A sample of the heated solid is then dissolved in water and treated with 10 drops of silver nitrate. A precipitate forms.
A sample of unheated solid is dissolved in water and 10 drops of silver nitrate are added. Nothing happens.
What classification should be given to the change that occurs when potassium chlorate is heated?
a. Physical
b. Chemical
c. Can’t tell from the information given
Explain your answer:
Explanation / Answer
1)
fizzing of antacid is releasing a gas which was not previously present. This means antacid has decomposed into some other compound and hence its chemical formula is changing. It’s a chemical change
Answer: b
2)
Upon heating, compound has decomposed and there has been release of gas. So, compound’s chemical formula is changing. It’s a chemical change
Answer: b
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