Practice Hard Water (3.7.1) - Water

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10 questions

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4 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What defines hard water?
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Think about what makes soap hard to use.
Question 2.
What type of hardness can be removed by boiling?
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Remember the method we discussed in class?
3Question 3.
What causes hard water?
- Chlorine
- Calcium and Magnesium
- Sodium
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Think about the minerals present in hard water.
4Question 4.
Temporary hardness can be removed by boiling.
- True
- False
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Recall the method for treating temporary hardness.
Question 5.
You have a water sample with a hardness level of 300 mg/L of CaCO₃. You want to soften it to less than 60 mg/L. Calculate how much washing soda is needed to achieve this reduction for 100 liters.
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Calculate the amount based on the removal needed.
Question 6.
Explain how the presence of hard water could affect the lifespan of home appliances. Provide at least two examples.
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Think about why appliances with heating elements might be affected.

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