Distinguishing between hard water and soft water Practice exercise 4

Which water source is most likely to be hard?

Peter washed clothes at his home using well water. Later, he visited his aunt who collected rainwater in a clean tank. He noticed that he needed more soap at home than at his aunt’s place. Which water source is most likely to be hard?  (1 mark)

Peter washed clothes at his home using well water. Later, he visited his aunt who collected rainwater in a clean tank. He noticed that he needed more soap at home than at his aunt’s place. Which water source is most likely to be hard?  (1 mark)

Peter washed clothes at his home using well water. Later, he visited his aunt who collected rainwater in a clean tank. He noticed that he needed more soap at home than at his aunt’s place. Which water source is most likely to be hard?  (1 mark)

Peter washed clothes at his home using well water. Later, he visited his aunt who collected rainwater in a clean tank. He noticed that he needed more soap at home than at his aunt’s place. Which water source is most likely to be hard?  (1 mark)

Jane notices that she needs more soap to wash clothes when using borehole water than when using rainwater. What can she conclude?

Jane notices that she needs more soap to wash clothes when using borehole water than when using rainwater. What can she conclude?  (1 mark)

Jane notices that she needs more soap to wash clothes when using borehole water than when using rainwater. What can she conclude?  (1 mark)

Jane notices that she needs more soap to wash clothes when using borehole water than when using rainwater. What can she conclude?  (1 mark)

Noah adds soap to two water samples. Sample A forms thick lather quickly, while Sample B forms little lather and leaves a white deposit. What is the most likely conclusion?

Noah adds soap to two water samples. Sample A forms thick lather quickly, while Sample B forms little lather and leaves a white deposit. What is the most likely conclusion?  (1 mark)

Noah adds soap to two water samples. Sample A forms thick lather quickly, while Sample B forms little lather and leaves a white deposit. What is the most likely conclusion?  (1 mark)

Noah adds soap to two water samples. Sample A forms thick lather quickly, while Sample B forms little lather and leaves a white deposit. What is the most likely conclusion?  (1 mark)

Two learners washed their hands with different water samples. Their observations are recorded below: LearnerObservation with soap AThick foam formed BLittle foam, scum seen Which statement best explains the difference?

Two learners washed their hands with different water samples. Their observations are recorded below: Learner Observation with soap A Thick foam formed B Little foam, scum seen Which statement best explains the difference?  (1 mark)

Two learners washed their hands with different water samples. Their observations are recorded below: Learner Observation with soap A Thick foam formed B Little foam, scum seen Which statement best explains the difference?  (1 mark)

Two learners washed their hands with different water samples. Their observations are recorded below: Learner Observation with soap A Thick foam formed B Little foam, scum seen Which statement best explains the difference?  (1 mark)

Two learners washed their hands with different water samples. Their observations are recorded below. Which statement best explains the difference?  (1 mark) Learner Observation with soap A Thick foam formed B Little foam, scum seen

A learner tested lathering of soap with two water samples. The results are shown below: Water SampleObservation when soap was added RainwaterMuch lather formed Well waterLittle lather, scum formed What conclusion can be made?

A learner tested lathering of soap with two water samples. The results are shown below: Water Sample Observation when soap was added Rainwater Much lather formed Well water Little lather, scum formed What conclusion can be made?  (1 mark)

A learner tested lathering of soap with two water samples. The results are shown below: Water Sample Observation when soap was added Rainwater Much lather formed Well water Little lather, scum formed What conclusion can be made?  (1 mark)

A learner tested lathering of soap with two water samples. The results are shown below. What conclusion can be made?  (1 mark) Water Sample Observation when soap was added Rainwater Much lather formed Well water Little lather, scum formed

If a school receives water from a borehole and students complain it doesn't lather well with soap, what could be a suitable solution to improve its use for cleaning?

A school in Kitui uses water from a borehole and from a rainwater tank. During cleaning, students observe that soap forms more lather with the rainwater than with the borehole water. What does this observation suggest about the two water sources?  (1 mark)

A school in Kitui uses water from a borehole and from a rainwater tank. During cleaning, students observe that soap forms more lather with the rainwater than with the borehole water. What does this observation suggest about the two water sources?  (1 mark)

A school in Kitui uses water from a borehole and from a rainwater tank. During cleaning, students observe that soap forms more lather with the rainwater than with the borehole water. What does this observation suggest about the two water sources?  (1 mark)

Table: Soap Test Results – Fig 2.7 Setup FlaskWater TypeLather FormedWhite Film Present ARainwaterYesNo BWell WaterNoYes Which flask contains soft water, and why?

During a science practical at a secondary school in Embu, students tested two types of water collected from school rain tanks and a nearby well. They added equal amounts of soap to each sample and recorded the following results: Flask Water Type Lather Formed White Film Present A Rainwater Yes No B Well Water No Yes Which flask contains soft water, and why?  (1 mark)

During a science practical at a secondary school in Embu, students tested two types of water collected from school rain tanks and a nearby well. They added equal amounts of soap to each sample and recorded the following results: Flask Water Type Lather Formed White Film Present A Rainwater Yes No B Well Water No Yes Which flask contains soft water, and why?  (1 mark)

During a science practical at a secondary school in Embu, students tested two types of water collected from school rain tanks and a nearby well. They added equal amounts of soap to each sample and recorded the following results. Which flask contains soft water, and why?  (1 mark) Flask Water Type Lather Formed White Film Present A Rainwater Yes No B Well Water No Yes

In a school experiment, learners add equal drops of soap to glasses containing river water and treated tap water. River water forms a white film and little lather. What conclusion can be made?

In a school experiment, learners add equal drops of soap to glasses containing river water and treated tap water. River water forms a white film and little lather. What conclusion can be made?  (1 mark)

In a school experiment, learners add equal drops of soap to glasses containing river water and treated tap water. River water forms a white film and little lather. What conclusion can be made?  (1 mark)

In a school experiment, learners add equal drops of soap to glasses containing river water and treated tap water. River water forms a white film and little lather. What conclusion can be made?  (1 mark)

During an investigation, a student uses untreated tap water, rainwater, and well water to wash their hands. They observe a white film only when using well water. What does this indicate about the well water?

During an investigation, a student uses untreated tap water, rainwater, and well water to wash their hands. They observe a white film only when using well water. What does this indicate about the well water?  (1 mark)

During an investigation, a student uses untreated tap water, rainwater, and well water to wash their hands. They observe a white film only when using well water. What does this indicate about the well water?  (1 mark)

During an investigation, a student uses untreated tap water, rainwater, and well water to wash their hands. They observe a white film only when using well water. What does this indicate about the well water?  (1 mark)

Table: Source Analysis – Fig 2.5 Context SourceWater TypeExpected LatherSuitability for Cleaning Well (Fig 2.5)Hard WaterLowPoor RainwaterSoft WaterHighGood Why might the well water be unsuitable for cleaning?

boarding school in Kericho uses water from a nearby well  and also collects rainwater in tanks. The science teacher provides the following observations from a soap test: Source Water Type Expected Lather Suitability for Cleaning Well (Fig 2.5) Hard Water Low Poor Rainwater Soft Water High Good Why might the well water be unsuitable for washing clothes at the school?  (1 mark)

boarding school in Kericho uses water from a nearby well  and also collects rainwater in tanks. The science teacher provides the following observations from a soap test: Source Water Type Expected Lather Suitability for Cleaning Well (Fig 2.5) Hard Water Low Poor Rainwater Soft Water High Good Why might the well water be unsuitable for washing clothes at the school?  (1 mark)

boarding school in Kericho uses water from a nearby well  and also collects rainwater in tanks. The science teacher provides the following observations from a soap test. Why might the well water be unsuitable for washing clothes at the school?  (1 mark) Source Water Type Expected Lather Suitability for Cleaning Well (Fig 2.5) Hard Water Low Poor Rainwater Soft Water High Good

boarding school in Kericho uses water from a nearby well  and also collects rainwater in tanks. The science teacher provides the following observations from a soap test. Why might the well water be unsuitable for washing clothes at the school?  (1 mark) Source Water Type Expected Lather Suitability for Cleaning Well Hard Water Low Poor Rainwater Soft Water High Good