hard water quiz

greenchloe1998
Quiz by greenchloe1998, updated more than 1 year ago
greenchloe1998
Created by greenchloe1998 almost 7 years ago
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Description

Quiz on hard water quiz, created by greenchloe1998 on 01/02/2015.

Resource summary

Question 1

Question
find the relative formula mass (Mr) of water. ( H20)
Answer
  • 18
  • 24
  • 36
  • 72

Question 2

Question
calculate the percentage of nitrogen in NH3.
Answer
  • 82.4
  • 78
  • 34.6

Question 3

Question
The moles of an element = mass of that element/ the relative atomic mass of that element. Sarah has 48 grams of magnesium, she believes she has two moles, is she right?
Answer
  • True
  • False

Question 4

Question
What are the advantages of hard water?
Answer
  • Prevention of heart disease.
  • it makes you feel happy
  • it contains minerals which may be good for your health.

Question 5

Question
If I add soap to water and it easily forms a lather, is it hard or soft water?
Answer
  • Hard water
  • Soft water

Question 6

Question
Which compounds are dissolved into temporary hard water?
Answer
  • Magnesium hydrogen carbonate and Calcium hydrogen carbonate.
  • Magnesium sulfate and calcium sulfate.

Question 7

Question
when boiling temporary hard water, what is the product it forms?
Answer
  • rust
  • limescale
  • nasty worms

Question 8

Question
Name the disadvantages of hard water.
Answer
  • more soap is needed to form a suitable lather.
  • It is bad for your eyes
  • it produces scum which is difficult to clean
  • Hard water cannot be used for industrial processes like dying materials.

Question 9

Question
Advantages of hard water. ( choose 3)
Answer
  • calcium helps growth of healthy bones and teeth.
  • magnesium helps an effective metabolism
  • less likely to suffer from heart disease.
  • the chemicals within it make you happier
  • it will help you succeed in your life.

Question 10

Question
calcium + sodium carbonate forms what?
Answer
  • soluble sodium ions + Calcium carbonate (limescale)
  • calcium stearate.
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