GMJ 6035 scientific outcome 2 test

What is the chemical formula of water?

• H2O2

• H2O

• HO2

• H3O

At what temperature does water boil at sea level?

• 0°C

• 50°C

• 100°C

• 273°C

How much does water expand when it freezes?

• 10%

• 50%

• 25%

• 5%

What is the maximum density of water?

• 0°C

• 4°C

• 100°C

• 273°C

When water turns into steam, how many times does it expand?

• 10 times

• 100 times

• 1600 times

• 1000 times

Which substance causes limescale to form in appliances?

• Calcium carbonate

• Sodium chloride

• Magnesium sulfate

• Potassium nitrate

What is the process called when water dissolves lead?

• Corrosion

• Plumbosolvent

• Evaporation

• Cuprosolvent

What pH value represents pure water?

• 1

• 7

• 10

• 14

How can temporary hardness in water be removed?

• By boiling water above 65°C

• By using a magnetic scale inhibitor

• By adding polyphosphate

• By using chemicals

What method is used to remove permanent hardness from water?

• Boiling

• Base exchange method

• Adding chemicals

• Using electrical inhibitors