Basic Concepts of ChemistryPhysical and Chemical Changes16Choose 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 ChemistryPhysical and Chemical Changes17Choose 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 Changes18Choose the best answerBurning a matchstick is an example of a:APhysical changeBChemical changeCChange in pressureDChange in colour only Like 0 Discuss 0Share
Fundamental Concepts of ChemistryPhysical and Chemical Changes19Choose the best answerWhich of the following are chemical processes? (1) Rusting of a nail (2) Freezing of water (3) Decomposition of water into H₂ and O₂ (4) Compression of O₂ gasA2, 3 and 4B1, 3 and 4C1 and 3D1 and 2 Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes20Choose the best answerWhich of the following represents a physical change?ACutting fruit into piecesBBurning coalCMelting waxDBoth A and C Like 0 Discuss 0Share