Temporary and Permanent Changes Practice Exercise 5

During a practical lesson in Tumaini Primary School, students added vinegar to baking soda. Bubbles were seen during the reaction.a) What observation shows that a chemical change has occurred? (1 mark) b) Why is this change considered temporary even though a gas is produced? (1 mark)

During a practical lesson in Tumaini Primary School, students added vinegar to baking soda. Bubbles were seen during the reaction.a) What observation shows that a chemical change has occurred? (1 mark) b) Why is this change considered temporary even though a gas is produced? (1 mark)

During a practical lesson in Tumaini Primary School, students added vinegar to baking soda. Bubbles were seen during the reaction.a) What observation shows that a chemical change has occurred? (1 mark) b) Why is this change considered temporary even though a gas is produced? (1 mark)

During a practical lesson in Tumaini Primary School, students added vinegar to baking soda. Bubbles were seen during the reaction.a) What observation shows that a chemical change has occurred? (1 mark) b) Why is this change considered temporary even though a gas is produced? (1 mark)

During a practical lesson in Tumaini Primary School, students added vinegar to baking soda. Bubbles were seen during the reaction. a) What observation shows that a chemical change has occurred? (1 mark)b) Why is this change considered permanent? (1 mark)

During a practical lesson in Tumaini Primary School, students added vinegar to baking soda. Bubbles were seen during the reaction. a) What observation shows that a chemical change has occurred? (1 mark)b) Why is this change considered permanent? (1 mark)

A student stretches a rubber band during an experiment.a) What type of change has taken place? (1 mark) b) Give a reason why this change is classified under that type. (1 mark)

A student stretches a rubber band during an experiment.a) What type of change has taken place? (1 mark) b) Give a reason why this change is classified under that type. (1 mark)

A blue cobalt chloride paper turns pink when exposed to moisture.a) What type of change is this? (1 mark) b) How can the original colour be restored? (1 mark)

A magnesium ribbon is heated in a Bunsen flame and produces a white ash as shown below.a) What does the white ash represent? (1 mark) b) Why is the formation of ash considered a permanent change? (1 mark)

A magnesium ribbon is heated in a Bunsen flame and produces a white ash as shown below.a) What does the white ash represent? (1 mark) b) Why is the formation of ash considered a permanent change? (1 mark)

Mercy folds a square paper into a boat shape during a class activity as shown below.a) Has a new substance been formed in this process? (1 mark) b) What makes this change a temporary physical change? (1 mark)

Mercy folds a square paper into a boat shape during a class activity as shown below.a) Has a new substance been formed in this process? (1 mark) b) What makes this change a temporary physical change? (1 mark)

A student heats blue hydrated copper(II) sulphate. It turns white. Water is later added.a) What observation shows a chemical reaction happened during heating? (1 mark) b) What result after adding water shows the change is temporary? (1 mark)

A white powder is heated. A colourless gas escapes. When cooled and water is added, the powder returns to its original state.a) What kind of chemical change is taking place? (1 mark) b) What observation proves that the change is temporary? (1 mark)

A student burns a piece of paper. Only ash remains.a) What type of change has taken place? (1 mark) b) What shows that the original paper cannot be recovered? (1 mark)

A student burns a piece of paper. Only ash remains.a) What type of change has taken place? (1 mark) b) What shows that the original paper cannot be recovered? (1 mark)

A metal gate left in the rain forms a brown layer after some weeks as shown below.a) What is the name of the brown layer that forms? (1 mark) b) Why can't this process be reversed easily? (1 mark)

A metal gate left in the rain forms a brown layer after some weeks as shown below.a) What is the name of the brown layer that forms? (1 mark) b) Why can't this process be reversed easily? (1 mark)

The diagram shows ice cubes left in a bowl. After some time, the ice melts and turns into water.a) What kind of change is taking place? (1 mark) b) Give one reason why this change is considered temporary. (1 mark)

The diagram shows ice cubes left in a bowl. After some time, the ice melts and turns into water.a) What kind of change is taking place? (1 mark) b) Give one reason why this change is considered temporary. (1 mark)

The diagram shows ice cubes left in a bowl. After some time, the ice melts and turns into water.a) What kind of change is taking place? (1 mark) b) Give one reason why this change is considered temporary. (1 mark)