Effects of impurities Practice Exercise 5

A student heats two beakers of water on a stove. Beaker A has pure water. Beaker B has water with sugar added. Beaker A boils first. Explain why. (2 marks)

A student heats two beakers of water on a stove. Beaker A has pure water. Beaker B has water with sugar added. Beaker A boils first. Explain why. (2 marks)

A student heats two beakers of water on a stove. Beaker A has pure water. Beaker B has water with sugar added. Beaker A boils first. Explain why. (2 marks)

In a cold town, a shopkeeper sprinkles salt on a frozen path to help people walk safely. Explain how the salt helps melt the ice.  (2 marks)

The diagram below shows a heating curve for two liquids. Curve A is for pure water, and Curve B is for salty water.Use the diagram to explain the effect of impurities on the boiling point. (2 marks)

The diagram below shows a heating curve for two liquids. Curve A is for pure water, and Curve B is for salty water.Use the diagram to explain the effect of impurities on the boiling point. (2 marks)

The diagram below shows a heating curve for two liquids. Curve A is for pure water, and Curve B is for salty water.Use the diagram to explain the effect of impurities on the boiling point. (2 marks)

The diagram below shows a heating curve for two liquids. Curve A is for pure water, and Curve B is for salty water.Use the diagram to explain the effect of impurities on the boiling point. (2 marks)

The diagram below shows two ice cubes. Cube A is pure ice. Cube B has salt sprinkled on it. Both are left in the same room temperature conditions.After 5 minutes, Cube B has melted more than Cube A. Explain scientifically why this happened. (2 marks)

The diagram below shows two ice cubes. Cube A is pure ice. Cube B has salt sprinkled on it. Both are left in the same room temperature conditions.After 5 minutes, Cube B has melted more than Cube A. Explain scientifically why this happened. (2 marks)

The diagram below shows two ice cubes. Cube A is pure ice. Cube B has salt sprinkled on it. Both are left in the same room temperature conditions.After 5 minutes, Cube B has melted more than Cube A. Explain scientifically why this happened. (2 marks)

Kairu wants to take a hot shower early in the morning. He heats two buckets of water — one with clean rainwater and another with muddy water from a nearby puddle. He notices that the muddy water takes longer to boil. Explain why the muddy water takes longer to boil. (1 mark)

Kairu wants to take a hot shower early in the morning. He heats two buckets of water — one with clean rainwater and another with muddy water from a nearby puddle. He notices that the muddy water takes longer to boil. Explain why the muddy water takes longer to boil. (1 mark)

Kairu wants to take a hot shower early in the morning. He heats two buckets of water — one with clean rainwater and another with muddy water from a nearby puddle. He notices that the muddy water takes longer to boil. Explain why the muddy water takes longer to boil. (2 marks)

Kairu wants to take a hot shower early in the morning. He heats two buckets of water — one with clean rainwater and another with muddy water from a nearby puddle. He notices that the muddy water takes longer to boil. Explain why the muddy water takes longer to boil. (2 marks)

A chef wants to boil water for soup as quickly as possible. She uses filtered water instead of salty or mineral-rich water. Explain scientifically why this is a good choice and how impurities affect boiling point. (2 marks)

A chef wants to boil water for soup as quickly as possible. She uses filtered water instead of salty or mineral-rich water. Explain scientifically why this is a good choice and how impurities affect boiling point. (2 marks)

During a science experiment, Asha recorded the boiling point of distilled water as 100°C. Her friend Njeri boiled tap water and recorded a boiling point of 103°C. The teacher confirmed both results were correct. Explain why the boiling points were different and what this shows about the effect of impurities. (2 marks)

During a science experiment, Asha recorded the boiling point of distilled water as 100°C. Her friend Njeri boiled tap water and recorded a boiling point of 103°C. The teacher confirmed both results were correct. Explain why the boiling points were different and what this shows about the effect of impurities. (2 marks)

The diagram shows two ice blocks left to melt at room temperature. Ice Block A is pure. Ice Block B has soil particles mixed in. After 10 minutes, Block B has melted more.Use the diagram to explain how impurities affect the melting point and why Block B melts faster. (2 marks)

The diagram shows two ice blocks left to melt at room temperature. Ice Block A is pure. Ice Block B has soil particles mixed in. After 10 minutes, Block B has melted more.Use the diagram to explain how impurities affect the melting point and why Block B melts faster. (2 marks)

A student heats two samples of wax. One is pure wax, and the other contains sand as an impurity. The student observes that the impure wax melts at a lower temperature. Explain why this happens. (2 marks)

A student heats two samples of wax. One is pure wax, and the other contains sand as an impurity. The student observes that the impure wax melts at a lower temperature. Explain why this happens. (2 marks)

A student heats two samples of wax. One is pure wax, and the other contains sand as an impurity. The student observes that the impure wax melts at a lower temperature. Explain why this happens. (2 marks)

The diagram below shows heating curves for two samples of the same substance. Curve A is for the pure sample, and Curve B is for the impure sample. Use the graph to explain how the presence of impurities affects the melting point of the substance. (2 marks)

The diagram below shows heating curves for two samples of the same substance. Curve A is for the pure sample, and Curve B is for the impure sample.Use the graph to explain how the presence of impurities affects the melting point of the substance. (2 marks)

The diagram below shows heating curves for two samples of the same substance. Curve A is for the pure sample, and Curve B is for the impure sample. Use the graph to explain how the presence of impurities affects the melting point of the substance. (2 marks)