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Questions and Answers
Which of the following is an example of a physical change?
Which of the following is an example of a physical change?
- Food spoilage
- Burning
- Boiling (correct)
- Rusting
All chemical changes are reversible.
All chemical changes are reversible.
False (B)
What process describes a solid changing directly to a gas without becoming a liquid?
What process describes a solid changing directly to a gas without becoming a liquid?
sublimation
When water changes from gas to liquid, this process is called __________.
When water changes from gas to liquid, this process is called __________.
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Match the following changes with their descriptions:
Match the following changes with their descriptions:
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Study Notes
Physical Changes
- Melting: Transition from solid to liquid, such as ice turning to water.
- Boiling or Vaporization: Conversion of liquid into gas, as seen when water boils.
- Freezing: Process where liquid becomes solid, exemplified by water freezing into ice.
- Sublimation: Transformation from solid directly to gas, like dry ice.
- Deposition: Change from gas to solid without passing through the liquid state, as seen with frost formation.
- Condensation: Process in which gas turns into a liquid, such as water droplets forming on a cold surface.
Signs of a Chemical Change
- Color Change: A noticeable shift in color indicating a chemical reaction.
- Production of an Odor: Release of new scents, like burning wood.
- Burning: Combustion that alters the original substances, producing heat and light.
- Rusting: Oxidation of metals, such as iron forming rust upon exposure to moisture.
- Food Spoilage: Chemical reactions that lead to the deterioration of food, altering taste and safety.
Importance of Changes
- Physical and chemical changes are fundamental processes in nature and human life.
- Most chemical changes are irreversible, meaning substances cannot return to their original state.
- Some physical changes are reversible, allowing substances to revert to their initial form.
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