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The following words or phrases are omitted from the passage below: lime sand and gravel fluorine chlorine plastic a flocculating agent Write in your answer book the word or phrase corresponding to each number 1 to 6 - Leaving Cert Chemistry - Question 9 - 2016
Question 9
The following words or phrases are omitted from the passage below: lime sand and gravel fluorine chlorine plastic a flocculating agent Write in your answer book th... show full transcript
Worked Solution & Example Answer:The following words or phrases are omitted from the passage below: lime sand and gravel fluorine chlorine plastic a flocculating agent Write in your answer book the word or phrase corresponding to each number 1 to 6 - Leaving Cert Chemistry - Question 9 - 2016
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2. What are the two different types of water hardness?
Answer
The two types of water hardness are:
- Temporary hardness, caused by dissolved calcium or magnesium hydrogen carbonate, which can be removed by boiling the water.
- Permanent hardness, caused by dissolved chlorides or sulfates of calcium or magnesium, which cannot be removed by boiling.
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3. Which of the two types is suggested by the build-up of the scale on the element? Explain your answer.
Answer
The build-up of scale on the kettle element suggests the presence of permanent hardness. This is indicated by the deposits formed, which typically result from calcium or magnesium chlorides or sulfates that do not precipitate when heated.
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