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Questions and Answers
What type of change is cutting a piece of paper into pieces?
What type of change is cutting a piece of paper into pieces?
- Physical change
- Irreversible change (correct)
- Chemical change
- Reversible change
Which action showcases reversible changes in matter?
Which action showcases reversible changes in matter?
- Cutting a piece of paper
- Burning paper
- Melting ice (correct)
- Cooking a raw egg
What happens when rusting occurs on iron?
What happens when rusting occurs on iron?
- It becomes irreversible (correct)
- It undergoes reversible changes
- It turns into liquid iron
- It can be transformed back into iron
Which process causes irreversible changes in an egg?
Which process causes irreversible changes in an egg?
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What type of change is heating ice until it turns into water?
What type of change is heating ice until it turns into water?
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Study Notes
- Modeling clay can be transformed into different shapes through actions like pushing, pulling, or twisting, and can also be rolled back into its original shape, showcasing reversible changes in matter.
- Heating ice causes it to melt into water, known as melting, and cooling the water turns it back into solid ice, known as freezing, demonstrating reversible changes in matter.
- Cooking a raw egg turns it from liquid to solid, with the change being irreversible even if it cools down.
- Cutting a piece of paper is an irreversible change as the pieces cannot be turned back into a whole paper.
- Burning paper turns it into ash, which cannot be transformed back into paper, showcasing another irreversible change. Rusting iron when it reacts with water and oxygen is also irreversible, as rust cannot be changed back into iron.
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