Water

The diagram illustrates how water is processed so that it becomes safe for drinking. What occurs in stage 2?

Feb/March 2016

The diagram illustrates the process used to treat water so that it becomes safe to drink. stage 1: reservoir → stage 2 → stage 3: chlorination → stage 4: drinking water What takes place at stage 2?

Feb/March 2016

Water has to be treated before it becomes suitable for household use. Which processes are used to remove suspended solids and to destroy bacteria?

Feb/March 2018

Water has to be purified before it can be used safely in the home. Which processes are used to remove solid impurities and to kill bacteria?

Feb/March 2018

The diagram illustrates how water is processed so that it becomes safe to drink. stage 1: reservoir of water $\rightarrow$ stage 2 $\rightarrow$ stage 3: chlorination $\rightarrow$ stage 4: drinking water What takes place in stage 2?

Feb/March 2019

The diagram illustrates how water is treated so that it is fit for drinking. stage 1: water reservoir → stage 2 → stage 3: chlorination → stage 4: drinking water What takes place in stage 2?

Feb/March 2019

Which test is used to demonstrate that a water sample is pure?

Feb/March 2020

Water is processed at a waterworks so that it becomes safe to drink. What is contained in the water as it leaves the waterworks?

Feb/March 2020

What test is used to show that a water sample is pure?

Feb/March 2020

Water is treated at a waterworks so that it becomes safe to drink. What substance is in the water as it leaves the waterworks?

Feb/March 2020

Water is vital in many industrial processes.

Feb/March 2020

Water is processed at a waterworks so that it becomes safe to drink. What is contained in the water as it leaves the waterworks?

Feb/March 2023

Draw a diagram of the filtration apparatus used to separate the soil from the solution formed after the soil is shaken with distilled water. On your diagram, label: the filtrate; the residue.

Feb/March 2023

Table 2.1 lists the masses of several ions present in a $1000\,\text{cm}^3$ sample of river water.

Feb/March 2024

Which of the following statements about the treatment of domestic water supplies are correct?

Feb/March 2025

Which of the following are tests used for water?

May/June 2016

Lime (calcium oxide) is added to treat waste water produced by a factory. Which substance does the lime remove?

May/June 2016

Lime (calcium oxide) is used in the treatment of waste water from a factory. Which substance does the lime remove?

May/June 2016

The diagram illustrates several domestic uses of water. For which of these uses is it important that the water has been treated?

May/June 2017

Two experiments that involve water are given below. 1 When potassium manganate(VII) is added to water, the water becomes purple. 2 When water is added to sodium, the temperature rises. Which row gives the role of water in 1 and 2?

May/June 2017

The diagram illustrates some ways water is used in the home. For which uses is it important that the water has been treated?

May/June 2017

The diagram illustrates several ways water is used in the home. For which of these uses is it important that the water has been treated?

May/June 2017

The diagram illustrates several ways in which water is used in the home. For which of these uses is it important that the water has been treated?

May/June 2017

The diagram illustrates several ways water is used in the home. For which of these uses is it important that the water has been treated?

May/June 2017

The diagram illustrates several uses of water in the home. For which of these uses is it necessary for the water to have been treated?

May/June 2017

Which of the following statements about water are correct? 1. Household water has dissolved salts. 2. Water intended for household use is filtered to remove soluble impurities. 3. Chlorine is added to water to kill bacteria. 4. Water is used in industry for cooling.

May/June 2018

Which of the following statements about water are correct?

May/June 2018

Which of the following statements about water are correct?

May/June 2018

Which of the following statements about water are correct?

May/June 2018

Which of the following statements about water are correct?

May/June 2018

Which of these statements about water are correct?

May/June 2018

Water may be treated by filtration followed by chlorination. Which uses do not require water of this standard?

May/June 2019

Water may be purified by filtration followed by chlorination. Which uses do not require water of this standard?

May/June 2019

Water may be purified by filtration followed by chlorination. Which of these uses do not need water of this standard?

May/June 2019

Water may be treated by filtration followed by chlorination. Which uses do not require water of this quality?

May/June 2019

Water may be treated first by filtration and then by chlorination. Which uses do not require water of this standard?

May/June 2019

Water may be purified by first filtering it and then adding chlorine. Which uses do not require water of this standard?

May/June 2019

The table presents the percentage by mass of the elements found in the oceans and in the biosphere. The biosphere refers to all living organisms.

May/June 2019

Water is taken from reservoirs and passes through several treatment stages so that it becomes safe to drink. Which of the following statements about the stages are correct?

May/June 2021

Water is used to irrigate crops and as drinking water. For which uses does water need to be chlorinated?

May/June 2021

What effects may arise from an inadequate water supply during a drought?

May/June 2021

This question concerns water.

May/June 2021

The diagram illustrates the uses of muddy river water and the treatment steps it goes through. muddy river water → process 1 → clear river water → process 2 → disinfected water Which row correctly matches uses 1 and 2 with processes 1 and 2?

May/June 2022

A number of processes are carried out to treat domestic water. Which row identifies a reason for the process shown?

May/June 2023

Which process is used to make drinking water from sea water?

May/June 2023

Water drawn from a reservoir is sent to the water works, where purification stage 1 occurs and is then followed by stage 2. What are stage 1 and stage 2?

May/June 2023

Which of the following statements about water are correct?

May/June 2023

Domestic water is treated by using a number of different processes. Which row states why the process given is carried out?

May/June 2023

A candle made of wax consists of a blend of hydrocarbons. It is ignited and then put inside a gas jar together with a strip of cobalt(II) chloride test paper, as shown. After a short period, the oxygen in the jar is used up and the candle flame goes out. Which substance is identified by the cobalt(II) chloride paper?

May/June 2023

Water from a reservoir is sent to the water works, where process 1 is carried out and then process 2 follows. What are processes 1 and 2?

May/June 2023

Which of the following statements about water are correct?

May/June 2023

Natural water sources contain gases dissolved in the water.

May/June 2023

State two other substances in water that are harmful to aquatic life.

May/June 2023

Name two other harmful substances that may be found in polluted water and are dangerous to aquatic life.

May/June 2023

Water is taken from a river to supply households with water. Some domestic-water treatments are listed below: chlorination; sedimentation and filtration; treatment with carbon. Which statement about these treatments is correct?

May/June 2024

Which of the following statements about the treatment of domestic water supplies are correct?

May/June 2024

Which of the following statements about water is correct?

May/June 2024

The substances below have been detected in water taken from a river. 1 plastics 2 nitrates 3 oxygen Which of these substances can harm aquatic life?

May/June 2024

Which substances can be used to show the presence of water?

May/June 2025

Water taken from natural sources may have many substances dissolved in it. Which of these substances are often harmful to aquatic life?

May/June 2025

A water sample collected from a river contains harmful microbes. What is one source of the harmful microbes in the river water?

May/June 2025

This question concerns water and air.

May/June 2025

This question concerns water and air.

May/June 2025

This question concerns air and water.

May/June 2025

River water may contain soluble impurities, insoluble impurities and bacteria. It is rendered safe for drinking by filtration and chlorination. Which statement is correct?

Oct/Nov 2016

Hydrated cobalt(II) chloride crystals are pink in colour. On heating, they lose water and produce blue anhydrous cobalt(II) chloride. $\text{hydrated cobalt(II) chloride} \rightleftharpoons \text{anhydrous cobalt(II) chloride} + \text{water}$. A few drops of vinegar were put onto anhydrous cobalt(II) chloride. The colour then changed from blue to pink. What does this colour change indicate about vinegar?

Oct/Nov 2016

The diagram shows the water cycle. At what stage in the cycle are soluble impurities removed from the water?

Oct/Nov 2016

The bar charts set out the ion concentrations in two water samples, sample A and sample B.

Oct/Nov 2016

The flow chart illustrates the stages used to treat river water so that it becomes drinking water. What happens at stages X and Y?

Oct/Nov 2017

The flow diagram illustrates the steps used to treat river water so that drinking water is obtained. What happens at stages X and Y?

Oct/Nov 2017

The flow diagram sets out the steps in treating river water so that it can be made into drinking water. river water $\rightarrow$ settling tank $\rightarrow$ stage X $\rightarrow$ stage Y $\rightarrow$ drinking water What happens at stages X and Y?

Oct/Nov 2017

A portion of liquid X turns blue cobalt(II) chloride paper pink. The sample boils at $102^\circ\text{C}$. Which statements are correct?

Oct/Nov 2017

The flow chart illustrates the stages used to treat river water in order to make drinking water. What happens at stages X and Y?

Oct/Nov 2017

The flow chart illustrates the stages used to treat river water so that it becomes drinking water. What takes place at stages X and Y?

Oct/Nov 2017

The flow chart illustrates the stages used to treat river water so that it becomes drinking water. river water $\rightarrow$ settling tank $\rightarrow$ stage $X$ $\rightarrow$ stage $Y$ $\rightarrow$ drinking water What happens at stages $X$ and $Y$?

Oct/Nov 2017

The table shows three kinds of water. Which statement is correct?

Oct/Nov 2018

The table shows three kinds of water. Which statement is correct?

Oct/Nov 2018

The table shows three kinds of water. Which statement is correct?

Oct/Nov 2018

River water can include soluble impurities, insoluble impurities, and bacteria. To make river water safe for drinking, it is filtered and then chlorinated. Which statement is correct?

Oct/Nov 2019

Soluble impurities, insoluble impurities and bacteria are present in river water. It is made fit to drink by filtration and chlorination. Which statement is correct?

Oct/Nov 2019

River water contains soluble impurities, insoluble impurities, and bacteria. It is rendered safe for drinking by filtration and chlorination. Which statement is correct?

Oct/Nov 2019

River water contains dissolved impurities, undissolved impurities and bacteria. River water is made safe for drinking by filtration and chlorination. Which statement is correct?

Oct/Nov 2019

River water includes soluble impurities, insoluble impurities and bacteria. It is treated by filtration and chlorination so that it becomes safe for drinking. Which statement is correct?

Oct/Nov 2019

River water has soluble impurities, insoluble impurities and bacteria in it. It is made safe for drinking by filtration and chlorination. Which statement is correct?

Oct/Nov 2019

Water is cleaned by passing it through a series of stages. Four stages are shown below. 1. Chlorine is introduced into the water to destroy any bacteria. 2. The water is run through coarse gravel so that large bits of dirt are removed. 3. The water is run through wire screens so that large twigs are removed. 4. The water is run through fine sand so that small particles are removed. What is the correct sequence for carrying out these stages?

Oct/Nov 2020

The diagrams illustrate several ways water is used in the home. For which of these uses is it important that the water has been treated?

Oct/Nov 2021

A factory’s waste water is treated using lime (calcium oxide). Which substance is taken out by the lime?

Oct/Nov 2021

The diagrams illustrate several ways water is used in the home. For which of these uses does the water need to have been treated?

Oct/Nov 2021

The diagrams illustrate a few ways water is used in the home. For which of these uses is it important that the water has been treated?

Oct/Nov 2021

Lime (calcium oxide) is used to treat waste water from a factory. Which substance is eliminated by the lime?

Oct/Nov 2021

The diagram illustrates one stage in the purification of dirty water. Which process is shown by this apparatus?

Oct/Nov 2022

The diagram illustrates one stage in the purification of dirty water. Which process is shown by this apparatus?

Oct/Nov 2022

What test is used to demonstrate that a sample of water is pure?

Oct/Nov 2023

The flow chart illustrates the stages used to treat river water so that drinking water is produced. river water → sedimentation tank → stage J → stage K → drinking water What happens at stages J and K?

Oct/Nov 2023

Some ways in which water is used are shown below. 1 for drinking 2 in chemical reactions 3 in swimming pools 4 in washing Which of these uses require the water to be chlorinated?

Oct/Nov 2023

What test is carried out to prove that a water sample is pure?

Oct/Nov 2023

The flow chart illustrates the stages used to treat river water so that it becomes drinking water. What occurs at stages J and K?

Oct/Nov 2023

Some uses of water are given below. For which uses is it necessary to chlorinate the water?

Oct/Nov 2023

Which substances naturally present in water are helpful to aquatic animals?

Oct/Nov 2024

Which pollutants in river water cause deoxygenation?

Oct/Nov 2024