Fundamental Concepts of ChemistryPhysical Changes16Choose the best answerWhich is NOT a characteristic of a physical change?AFormation of a new substanceBChange may be reversibleCChemical composition remains unchangedDPhysical properties may change Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChemical Changes17Choose the best answerBurning a matchstick is an example of:APhysical changeBChemical changeCChange in pressureDChange in colour only Like 0 Discuss 0Share
Fundamental Concepts of ChemistryReversible Physical Changes18Choose the best answerWhich is a reversible physical change?AGrinding wood into sawdustBCutting down a treeCHeating an iron nail and allowing it to coolDBoth A and B Like 0 Discuss 0Share
Fundamental Concepts of ChemistryEnergy Changes in Physical Changes19Choose the best answerWhich statement about energy changes during a physical change is correct?AEnergy never changesBEnergy is always absorbedCEnergy is always releasedDEnergy may be absorbed or released Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChanges of State20Choose the best answerSolid → Liquid → Gas represents which sequence of physical changes?AFreezing → BoilingBMelting → BoilingCSublimation → DepositionDMelting → Freezing Like 0 Discuss 0Share