Basic Concepts of ChemistryPhysical and Chemical Changes21Choose the best answerWhich of the following is not a characteristic of a physical change?AFormation of a new substanceBReversibleCTemporaryDChange in physical properties Like 0 Discuss 0Share
Basic Concepts of ChemistryElements, Compounds and Mixtures22Choose the best answerWhich of the following best describes a compound?ATwo or more elements physically mixedBTwo or more elements chemically combinedCA mixture of two or more substancesDA substance that can be separated by filtration Like 0 Discuss 0Share
Basic Concepts of ChemistryMatter and its Classification23Choose the best answerWhat is a pure substance?AA substance made of two or more componentsBA substance with fixed composition and distinct propertiesCA mixture of different substancesDA substance that can be separated by physical methods Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes24Choose the best answerA physical change involves:ANo change in energyBEnergy is always absorbedCEnergy is always releasedDNone of these Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes25Choose the best answerBurning a matchstick is an example of a:APhysical changeBChemical changeCChange in pressureDChange in colour only Like 0 Discuss 0Share