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Questions and Answers
Which of the following is an example of a physical change?
All chemical changes are reversible.
False
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 __________.
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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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Description
Explore the differences between physical and chemical changes in this informative quiz. Learn about the various processes such as melting, boiling, and sublimation, along with signs of chemical changes like color change and rusting. Test your understanding of how these fundamental changes impact our everyday life.
