Temporary and Permanent Changes Practice Exercise 3

A student claims that all chemical changes are permanent. Using scientific reasoning, explain why this claim is incorrect. (2 marks)

A white substance is heated and gives off gas. When cooled and water is added, it becomes white again. a) What shows that this is a chemical change? (1 mark) b) What makes it temporary? (1 mark)

A white substance is heated and gives off gas. When cooled and water is added, it becomes white again. a) What shows that this is a chemical change? (1 mark) b) What makes it temporary? (1 mark)

The diagram below shows a block of ice melting into water.a) Identify the type of change shown. (1 mark) b) State two characteristics of the change shown. (2 marks) c) Explain why this is considered a temporary physical change. (2 marks)

The diagram below shows a block of ice melting into water.a) Identify the type of change shown. (1 mark) b) State two characteristics of the change shown. (2 marks) c) Explain why this is considered a temporary physical change. (2 marks)

The diagram below shows a block of ice melting into water. a) Identify the type of change shown. (1 mark)b) State two characteristics of the change shown. (2 marks)c) Explain why this is considered a temporary physical change. (2 marks)

The diagram below shows a block of ice melting into water. a) Identify the type of change shown. (1 mark)b) State two characteristics of the change shown. (2 marks)c) Explain why this is considered a temporary physical change. (2 marks)

A student says that if a new substance is formed, the change must be permanent. Do you agree or disagree? Explain your answer using scientific reasoning and an example.  (3 marks)

A student says that if a new substance is formed, the change must be permanent. Do you agree or disagree? Explain your answer using scientific reasoning and an example.  (3 marks)

A student says that if a new substance is formed, the change must be permanent. Do you agree or disagree? Explain your answer using scientific reasoning and an example.  (3 marks)

A student says that if a new substance is formed, the change must be permanent. Do you agree or disagree? Explain your answer using scientific reasoning and an example.  (3 marks)

The image shows a plastic bottle being squeezed and then released.a) What type of change has occurred? (1 mark) b) Is any new substance formed? Explain. (2 marks) c) State two other examples of this type of change that involve a change in shape. (2 marks)

The image shows a plastic bottle being squeezed and then released.a) What type of change has occurred? (1 mark) b) Is any new substance formed? Explain. (2 marks) c) State two other examples of this type of change that involve a change in shape. (2 marks)

The image shows a plastic bottle being squeezed and then released. a) What type of change has occurred? (1 mark)b) Is any new substance formed? Explain. (2 marks)c) State two other examples of this type of change that involve a change in shape. (2 marks)

The image shows a plastic bottle being squeezed and then released. a) What type of change has occurred? (1 mark)b) Is any new substance formed? Explain. (2 marks)c) State two other examples of this type of change that involve a change in shape. (2 marks)

The diagram below shows an experiment where Cobalt (II) chloride crystals are heated in a boiling tube and water vapour is collected in a test tube.a) What chemical change occurs when the Cobalt (II) chloride is heated? (1 mark) b) State the observation made in the boiling tube during heating. (1 mark) c) Explain why this change is classified as a temporary chemical change. (3 marks)

The diagram below shows an experiment where Cobalt (II) chloride crystals are heated in a boiling tube and water vapour is collected in a test tube.a) What chemical change occurs when the Cobalt (II) chloride is heated? (1 mark) b) State the observation made in the boiling tube during heating. (1 mark) c) Explain why this change is classified as a temporary chemical change. (3 marks)

The diagram below shows an experiment where Cobalt (II) chloride crystals are heated in a boiling tube and water vapour is collected in a test tube.a) What chemical change occurs when the Cobalt (II) chloride is heated? (1 mark) b) State the observation made in the boiling tube during heating. (1 mark) c) Explain why this change is classified as a temporary chemical change. (3 marks)

The diagram below shows an experiment where Cobalt (II) chloride crystals are heated in a boiling tube and water vapour is collected in a test tube. a) What chemical change occurs when the Cobalt (II) chloride is heated? (1 mark)b) State the observation made in the boiling tube during heating. (1 mark)c) Explain why this change is classified as a temporary chemical change. (3 marks)

The diagram below shows an experiment where Cobalt (II) chloride crystals are heated in a boiling tube and water vapour is collected in a test tube. a) What chemical change occurs when the Cobalt (II) chloride is heated? (1 mark)b) State the observation made in the boiling tube during heating. (1 mark)c) Explain why this change is classified as a temporary chemical change. (3 marks)

Describe the difference between temporary physical changes and temporary chemical changes.  (4 marks)

Describe the difference between temporary physical changes and temporary chemical changes.  (4 marks)

Describe the difference between temporary physical changes and temporary chemical changes.  (4 marks)

Describe the difference between temporary physical changes and temporary chemical changes.  (4 marks)

Describe the difference between temporary physical changes and temporary chemical changes.  (4 marks)

The diagram shows a shiny piece of copper being heated strongly in air. It turns black after a while.a) What is the black substance formed? (1 mark) b) Explain how this change shows that a chemical reaction took place. (2 marks) c) Is this change reversible? Give a reason. (1 mark)

The diagram shows a shiny piece of copper being heated strongly in air. It turns black after a while.a) What is the black substance formed? (1 mark) b) Explain how this change shows that a chemical reaction took place. (2 marks) c) Is this change reversible? Give a reason. (1 mark)

Burning wood is a common example of a chemical reaction.a) What type of change is taking place when wood burns? (1 mark) b) List two substances formed when wood burns. (1 mark) c) Explain why this change cannot be reversed. (1 mark)

Burning wood is a common example of a chemical reaction.a) What type of change is taking place when wood burns? (1 mark) b) List two substances formed when wood burns. (1 mark) c) Explain why this change cannot be reversed. (1 mark)

Burning wood is a common example of a chemical reaction.a) What type of change is taking place when wood burns? (1 mark) b) List two substances formed when wood burns. (1 mark) c) Explain why this change cannot be reversed. (1 mark)

The diagram shows an experiment where Copper (II) sulphate is heated in a boiling tube, and a colourless liquid is collected in a test tube placed in ice-cold water.a) Describe two observations made during the experiment. (2 marks) b) Using evidence from the experiment, explain why this change is not permanent. (1 mark)

The diagram shows an experiment where Copper (II) sulphate is heated in a boiling tube, and a colourless liquid is collected in a test tube placed in ice-cold water.a) Describe two observations made during the experiment. (2 marks) b) Using evidence from the experiment, explain why this change is not permanent. (1 mark)

The diagram shows an experiment where Copper (II) sulphate is heated in a boiling tube, and a colourless liquid is collected in a test tube placed in ice-cold water.a) Describe two observations made during the experiment. (2 marks) b) Using evidence from the experiment, explain why this change is not permanent. (1 mark)