Basic Concepts of ChemistryPhysical and Chemical Changes16Choose the best answerWhich of the following is not a chemical change?APhotosynthesisBDigestionCTearing a paperDRusting of iron Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes17Choose the best answerWhich description best fits a reversible physical change?APermanent and reversibleBTemporary and irreversibleCTemporary and reversibleDPermanent and irreversible Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes18Choose the best answerWhich of the following is an example of a chemical change?ABoiling of waterBBurning of paperCEvaporation of waterDMelting of ice Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes19Choose the best answerWhich of the following 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
Basic Concepts of ChemistryPhysical and Chemical Changes20Choose the best answerSolid → Liquid → Gas involves the sequence:AFreezing → BoilingBMelting → BoilingCSublimation → DepositionDMelting → Freezing Like 0 Discuss 0Share