Physical properties of water Practice exercise 1

The diagram below shows different water samples with varying appearances. Explain what causes the color differences between hard water and soft water samples. (2 marks)

The diagram below shows different water samples with varying appearances. Explain what causes the color differences between hard water and soft water samples. (2 marks)

Study the diagram below showing the inside of a kettle after months of use with untreated borehole water. Explain what causes the white deposits seen in the diagram and name two minerals responsible.  (2 marks)

Study the diagram below showing the inside of a kettle after months of use with untreated borehole water. Explain what causes the white deposits seen in the diagram and name two minerals responsible.  (2 marks)

List three physical properties of water that can be observed without using any scientific instruments. (3 marks)

List three physical properties of water that can be observed without using any scientific instruments. (3 marks)

Name two minerals commonly found in hard water.  (2 marks)

What causes water to become hard?  (1 mark)

Describe how dissolved minerals affect the boiling point of water. (2 marks)

Explain why some borehole water in Kenya appears reddish or brownish in colour. (2 marks)

Give two reasons why hard water may leave deposits in kettles or pipes. (2 marks)

Identify the reason why sulphur-rich well water may have an unpleasant odour. (2 marks)

Study the table below showing observations made on four different water samples collected from different sources in Kenya.  Sample Source Colour Odour Sediment Presence A Borehole Brownish Metallic smell Present B River Slightly clear No smell Light sediment C Tap(urban) Clear None None D Well(rural) Reddish tint Rotten egg smell Heavy sediment Using the information in the table: (a) Identify which two samples are most likely to contain high levels of minerals. (1 mark) (b) Explain your choices using the observed physical properties. (2 marks)

Study the table below showing observations made on four different water samples collected from different sources in Kenya.  Sample Source Colour Odour Sediment Presence A Borehole Brownish Metallic smell Present B River Slightly clear No smell Light sediment C Tap(urban) Clear None None D Well(rural) Reddish tint Rotten egg smell Heavy sediment Using the information in the table: (a) Identify which two samples are most likely to contain high levels of minerals. (1 mark) (b) Explain your choices using the observed physical properties. (2 marks)