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Questions and Answers
What type of change occurs when ice melts into water?
What type of change occurs when ice melts into water?
- Physical change (correct)
- Phase change
- Thermal change
- Chemical change
Which of the following describes a characteristic of physical changes?
Which of the following describes a characteristic of physical changes?
- They are irreversible.
- They result in the formation of a new substance.
- They maintain the internal composition of the substance. (correct)
- They lead to permanent alterations in the chemical structure.
Which process is an example of sublimation?
Which process is an example of sublimation?
- Steam condensing into water.
- Ice transforming directly into vapor. (correct)
- A solid turning into a liquid.
- Water freezing into ice.
During which process does condensation occur?
During which process does condensation occur?
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What defines a chemical change?
What defines a chemical change?
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What occurs during the process of deposition?
What occurs during the process of deposition?
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Which is a true statement about burning a piece of paper?
Which is a true statement about burning a piece of paper?
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Study Notes
States of Matter
- Solid
- Liquid
- Gas
Temperature-related Terms
- Cool
- Melting
- Evaporation
- Freezing
- Hot
- Condensation
- Sublimation
- Deposition
Physical Change
- Any alteration of a substance from its original shape, size, and state
- Temporary changes that can be reversed easily
- Only physical state of matter is changed, internal composition of the substance remains the same
- Examples:
- Ice on heating changes into water, which on cooling changes into ice
- Water on heating forms water vapour, which on cooling gives back water
- Ice cubes → Water → Ice cubes
Chemical Change
- Permanent changes that cannot be reversed
- Internal chemical composition of the original substance changes into a completely new substance
- Examples:
- Burning a paper forms ash, which cannot be changed back to paper and has different properties
- Heating brings a chemical change in the burning of paper
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