Temporary and Permanent Changes Practice Exercise 7

Nia heated a saltwater solution in a dish. After some time, the water evaporated, and salt crystals remained at the bottom. i) What change did Nia observe? (1 mark) ii) What caused this change? (1 mark) iii) Why is this considered a temporary chemical change? (2 marks)

Nia heated a saltwater solution in a dish. After some time, the water evaporated, and salt crystals remained at the bottom. i) What change did Nia observe? (1 mark) ii) What caused this change? (1 mark) iii) Why is this considered a temporary chemical change? (2 marks)

Samuel soaked a handkerchief in water. Later, he placed it under the sun and it became dry. a) Name the process that occurred when the handkerchief dried. (1 mark) b) Explain why this process is classified as a temporary physical change. (2 marks) c) State what would happen to the water particles during the drying process. (1 mark)

Samuel soaked a handkerchief in water. Later, he placed it under the sun and it became dry. a) Name the process that occurred when the handkerchief dried. (1 mark) b) Explain why this process is classified as a temporary physical change. (2 marks) c) State what would happen to the water particles during the drying process. (1 mark)

Jane blows up a balloon with air. After a while, she lets go of the balloon and it returns to its original shape. a) Explain why this change is physical and not chemical. (1 mark)b) Describe what makes the change temporary. (1 mark)

Jane blows up a balloon with air. After a while, she lets go of the balloon and it returns to its original shape. a) Explain why this change is physical and not chemical. (1 mark)b) Describe what makes the change temporary. (1 mark)

Jane blows up a balloon with air. After a while, she lets go of the balloon and it returns to its original shape. a) Explain why this change is physical and not chemical. (1 mark)b) Describe what makes the change temporary. (1 mark)

Jane blows up a balloon with air. After a while, she lets go of the balloon and it returns to its original shape. a) Explain why this change is physical and not chemical. (1 mark)b) Describe what makes the change temporary. (1 mark)

A student burns a piece of paper during an experiment. The paper turns black and becomes ash. a) What type of change is burning paper, and why? (1 mark) b) Is this change reversible or not? Explain your answer. (1 mark) c) List two signs that a chemical change has taken place. (2 marks)

A student burns a piece of paper during an experiment. The paper turns black and becomes ash. a) What type of change is burning paper, and why? (1 mark) b) Is this change reversible or not? Explain your answer. (1 mark) c) List two signs that a chemical change has taken place. (2 marks)

The diagram below shows a beaker on a burner with sugar solution starting to bubble and darken slightly.a) What causes this change to happen? (1 mark)b) Why is the change considered temporary? (2 marks)

The diagram below shows a beaker on a burner with sugar solution starting to bubble and darken slightly.a) What causes this change to happen? (1 mark)b) Why is the change considered temporary? (2 marks)

A shiny copper strip is strongly heated using a flame. After a short time, its surface turns black. a) What new substance is formed on the surface of the copper? (1 mark) b) Is this change permanent or temporary? Give a reason. (1 mark)

A shiny copper strip is strongly heated using a flame. After a short time, its surface turns black. a) What new substance is formed on the surface of the copper? (1 mark) b) Is this change permanent or temporary? Give a reason. (1 mark)

The diagram shows a candle burning, with melted wax below and smoke rising.a) What part of the candle undergoes a permanent chemical change? (1 mark) b) What part undergoes a physical change? (1 mark) c) Explain why the burning of the wick is a permanent change. (2 marks)

The diagram shows a candle burning, with melted wax below and smoke rising.a) What part of the candle undergoes a permanent chemical change? (1 mark) b) What part undergoes a physical change? (1 mark) c) Explain why the burning of the wick is a permanent change. (2 marks)

The diagram shows a child tearing a sheet of paper into small pieces.a) Identify the type of change shown in the diagram. (1 mark) b) Justify why this change does not affect the nature of the material. (1 mark) c) Suggest and explain one other everyday example of this type of change. (2 marks)

The diagram shows a child tearing a sheet of paper into small pieces.a) Identify the type of change shown in the diagram. (1 mark) b) Justify why this change does not affect the nature of the material. (1 mark) c) Suggest and explain one other everyday example of this type of change. (2 marks)

a) Salma poured pancake batter into a hot pan. After a while, it changed from runny to solid and smelled sweet. i) What change did Salma observe? (1 mark) ii) Why is this a chemical change? (1 mark) iii) Why is it called a temporary chemical change? (1 mark)

Salma poured pancake batter into a hot pan. After a while, it changed from runny to solid and smelled sweet. i) What change did Salma observe? (1 mark) ii) Why is this a chemical change? (1 mark) iii) Why is it called a temporary chemical change? (1 mark)

A student mixes vinegar with baking soda. Bubbles form quickly and gas is released. a) What signs show that a chemical reaction has occurred? (2 marks) b) Can the baking soda be recovered after the reaction? Explain. (1 mark) c) Is this change permanent or temporary? (1 mark)

A student mixes vinegar with baking soda. Bubbles form quickly and gas is released. a) What signs show that a chemical reaction has occurred? (2 marks) b) Can the baking soda be recovered after the reaction? Explain. (1 mark) c) Is this change permanent or temporary? (1 mark)

The diagram shows ice cubes left in a glass at room temperature. After some time, the ice melts into water. a) Describe the change taking place in the diagram. (1 mark) b) Explain whether any new substance is formed during the change. (1 mark) c) State one reason why this change is considered temporary and physical. (1 mark)

The diagram shows ice cubes left in a glass at room temperature. After some time, the ice melts into water. a) Describe the change taking place in the diagram. (1 mark) b) Explain whether any new substance is formed during the change. (1 mark) c) State one reason why this change is considered temporary and physical. (1 mark)

The diagram shows ice cubes left in a glass at room temperature. After some time, the ice melts into water. a) Describe the change taking place in the diagram. (1 mark) b) Explain whether any new substance is formed during the change. (1 mark) c) State one reason why this change is considered temporary and physical. (1 mark)

The diagram below shows an egg in a frying pan turning from clear to white as heat is applied.a) What change is shown in the diagram? (1 mark) b) What caused this change? (1 mark) c) Why is the change considered permanent and chemical? (2 marks)

The diagram below shows an egg in a frying pan turning from clear to white as heat is applied.a) What change is shown in the diagram? (1 mark) b) What caused this change? (1 mark) c) Why is the change considered permanent and chemical? (2 marks)

During a science project, Aisha noticed that some iron sheets on a house roof had turned reddish-brown after months of rain.a) What type of change has taken place on the roof? (1 mark) b) Explain how you know the change is a permanent chemical change. (1 mark) c) Suggest one way to prevent this type of change from happening. (1 mark) d) Why can’t the rusted iron turn back into shiny iron just by wiping it? (1 mark)

During a science project, Aisha noticed that some iron sheets on a house roof had turned reddish-brown after months of rain.a) What type of change has taken place on the roof? (1 mark) b) Explain how you know the change is a permanent chemical change. (1 mark) c) Suggest one way to prevent this type of change from happening. (1 mark) d) Why can’t the rusted iron turn back into shiny iron just by wiping it? (1 mark)

During a science project, Aisha noticed that some iron sheets on a house roof had turned reddish-brown after months of rain. a) What type of change has taken place on the roof? (1 mark)b) Explain how you know the type of change that took place.  (1 mark)c) Suggest one way to prevent this type of change from happening. (1 mark)d) Why can’t the rusted iron turn back into shiny iron just by wiping it? (1 mark)

During a science experiment, learners dissolved sugar in warm water to observe what happens. a) Describe the process of dissolving sugar in water. (1 mark) b) Is this process a chemical or physical change? Give a reason. (1 mark) c) Explain how this change can be reversed. (1 mark)

During a science experiment, learners dissolved sugar in warm water to observe what happens. a) Describe the process of dissolving sugar in water. (1 mark) b) Is this process a chemical or physical change? Give a reason. (1 mark) c) Explain how this change can be reversed. (1 mark)

The diagram below shows vinegar being poured onto baking soda, producing bubbles.a) What does the bubbling show? (1 mark)b) Why is this change temporary? (1 mark)

The diagram below shows vinegar being poured onto baking soda, producing bubbles.a) What does the bubbling show? (1 mark)b) Why is this change temporary? (1 mark)

The diagram below shows vinegar being poured onto baking soda, producing bubbles. a) What does the bubbling show? (1 mark)b) Why is this change classified as a chemical change? (1 mark)