AQA GCSE Chemistry 3.2

1

True or false? Using hard water makes it more difficult for soap to lather.

1

Which of these rocks helps to cause hardness in water?

1

Which type of deposit forms when hard water reacts with soap?

1

Which type of deposit forms when hard water is boiled?

1

True or false? Calcium carbonate dissolves in carbonic acid (rainwater) to produce calcium ions and hydrogencarbonate ions.

1

Which type of hard water can be softened by heating?

1

True or false? Scale is formed upon heating temporary hard water because calcium hydrogencarbonate forms a precipitate.

1

Which of these methods can soften either type of hard water?

1

Which ion is exchanged with calcium and magnesium ions in an ion-exchange column?

1

True or false? Ion-exchange columns do not need to be regularly washed out with saline solution.

1

What is the first stage in the water treatment process?

1

What is the second stage in the water treatment process?

1

What is the third stage in the water treatment process?

1

What is the fourth stage in the water treatment process?

1

What is often contained in a filter cartridge?

1

What are health benefits of drinking hard water?

1

Which gas is sometimes used as an alternative to chlorine in killing bacteria?

1

Which ion is sometimes added to water to reduce the risk of tooth decay?

1

Which of these are arguments for the fluoridation of water?

1

Which of these are arguments against the fluoridation of water?

Twenty questions on the second section of Unit 3 in AQA GCSE Chemistry: Water.

AQA GCSE Chemistry 3.2

True or false? Using hard water makes it more difficult for soap to lather.

Which of these rocks helps to cause hardness in water?

Which type of deposit forms when hard water reacts with soap?

Which type of deposit forms when hard water is boiled?

True or false? Calcium carbonate dissolves in carbonic acid (rainwater) to produce calcium ions and hydrogencarbonate ions.

Which type of hard water can be softened by heating?

True or false? Scale is formed upon heating temporary hard water because calcium hydrogencarbonate forms a precipitate.

Which of these methods can soften either type of hard water?

Which ion is exchanged with calcium and magnesium ions in an ion-exchange column?

True or false? Ion-exchange columns do not need to be regularly washed out with saline solution.

What is the first stage in the water treatment process?

What is the second stage in the water treatment process?

What is the third stage in the water treatment process?

What is the fourth stage in the water treatment process?

What is often contained in a filter cartridge?

What are health benefits of drinking hard water?

Which gas is sometimes used as an alternative to chlorine in killing bacteria?

Which ion is sometimes added to water to reduce the risk of tooth decay?

Which of these are arguments for the fluoridation of water?

Which of these are arguments against the fluoridation of water?