Mastering Physical and Chemical Changes in Matter

Changes in State of Matter

• Four processes involved in a change in state of matter: melting, freezing, evaporation, and condensation
• Melting: change from solid to liquid state (increased temperature)
• Freezing: change from liquid to solid state (decreased temperature)
• Evaporation: change from liquid to gas state (increased temperature or surface area)
• Condensation: change from gas to liquid state (decreased temperature or surface area)

Dissolving Substances in Water

• Two ways to dissolve substances in water: mechanical mixing and dissolution
• Mechanical mixing: blending or stirring of substances to create a mixture
• Dissolution: dissolving of substances in water to create a solution

Physical and Chemical Changes

• Physical changes: involve a change in state or physical properties, but not composition
• Chemical changes: involve a change in composition, forming new substances
• Key difference: physical changes are reversible, chemical changes are irreversible

Test your knowledge of physical and chemical changes in matter, including observations of physical changes in daily life, changes in states of matter, and processes involved in these changes. Explore topics such as melting, freezing, boiling, evaporation, condensation, dissolving substances in water, stirring, and more.