Fundamental Concepts of ChemistryChemical Changes21Choose the best answerWhich of the following is a chemical change?AMelting of iceBDigestion of foodCFreezing of waterDCrushing of stone Like 0 Discuss 0Share
Fundamental Concepts of ChemistryMolecules and Molecular Mass22Choose the best answerWhich statement is incorrect?AH₂O is a heteroatomic moleculeBMolecular mass of H₂O₂ is 18 uCO₂ is a homodiatomic moleculeDA and C are correct Like 0 Discuss 0Share
Fundamental Concepts of ChemistryElements, Compounds and Mixtures23Choose the best answerWhich statement best describes a compound?ATwo or more elements physically mixedBTwo or more elements chemically combinedCA mixture of two or more substancesDA substance separable by filtration Like 0 Discuss 0Share
Fundamental Concepts of ChemistryReversible Physical Changes24Choose the best answerWhich description best represents a reversible physical change?APermanent and reversibleBTemporary and irreversibleCTemporary and reversibleDPermanent and irreversible Like 4 Discuss 0Share
Fundamental Concepts of ChemistryDiffusion25Choose the best answerThe spontaneous mixing and spreading of particles is called:AEvaporationBSublimationCDiffusionDBoiling Like 0 Discuss 0Share