1945783
Descripción
Test por greenchloe1998, actualizado hace más de 1 año
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Creado por greenchloe1998
hace más de 9 años
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Pregunta 1
Pregunta
find the relative formula mass (Mr) of water. ( H20)
Respuesta
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18
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24
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36
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72
Pregunta 2
Pregunta
calculate the percentage of nitrogen in NH3.
Respuesta
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82.4
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78
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34.6
Pregunta 3
Pregunta
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?
Respuesta
- True
- False
Pregunta 4
Pregunta
What are the advantages of hard water?
Respuesta
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Prevention of heart disease.
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it makes you feel happy
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it contains minerals which may be good for your health.
Pregunta 5
Pregunta
If I add soap to water and it easily forms a lather, is it hard or soft water?
Respuesta
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Hard water
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Soft water
Pregunta 6
Pregunta
Which compounds are dissolved into temporary hard water?
Respuesta
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Magnesium hydrogen carbonate and Calcium hydrogen carbonate.
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Magnesium sulfate and calcium sulfate.
Pregunta 7
Pregunta
when boiling temporary hard water, what is the product it forms?
Respuesta
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rust
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limescale
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nasty worms
Pregunta 8
Pregunta
Name the disadvantages of hard water.
Respuesta
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more soap is needed to form a suitable lather.
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It is bad for your eyes
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it produces scum which is difficult to clean
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Hard water cannot be used for industrial processes like dying materials.
Pregunta 9
Pregunta
Advantages of hard water. ( choose 3)
Respuesta
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calcium helps growth of healthy bones and teeth.
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magnesium helps an effective metabolism
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less likely to suffer from heart disease.
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the chemicals within it make you happier
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it will help you succeed in your life.
Pregunta 10
Pregunta
calcium + sodium carbonate forms what?
Respuesta
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soluble sodium ions + Calcium carbonate (limescale)
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calcium stearate.
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