Basic Concepts of ChemistryPhysical and Chemical Changes16Choose 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 ChemistryElements, Compounds and Mixtures17Choose the best answerWhen three elements X, Y, and Z chemically combine to form XYZ, the properties of XYZ are:ALike those of X and YBLike those of Y and ZCDifferent from those of X, Y, and ZDSimilar to both X and Y Like 0 Discuss 0Share
Basic Concepts of ChemistryElements, Compounds and Mixtures18Choose the best answerWhich of the following is a compound?AAirBCarbonCOxygenDSteam Like 0 Discuss 0Share
Basic Concepts of ChemistryPhysical and Chemical Changes19Choose 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 ChemistryElements, Compounds and Mixtures20Choose the best answerA compound contains:ADifferent kinds of atoms mixed togetherBThe same kind of atoms mixed togetherCDifferent kinds of atoms chemically combined togetherDThe same kind of atoms chemically combined together Like 0 Discuss 0Share