Fundamental Concepts of ChemistryParticulate Nature of Matter16Choose the best answerA 1 cm³ sample of N₂O gas contains:AElectronsBMoleculesCAtomsDAll of the above Like 0 Discuss 0Share
Fundamental Concepts of ChemistryPhysical Changes17Choose the best answerWhich is NOT a characteristic of a physical change?AFormation of a new substanceBChange may be reversibleCChemical composition remains unchangedDPhysical properties may change Like 0 Discuss 0Share
Fundamental Concepts of ChemistryTemperature Scale Conversion18Choose the best answerConvert 70°C into kelvin:A283 KB300 KC343 KD350 K Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChemical Changes19Choose the best answerBurning a matchstick is an example of:APhysical changeBChemical changeCChange in pressureDChange in colour only Like 0 Discuss 0Share
Fundamental Concepts of ChemistryReversible Physical Changes20Choose the best answerWhich 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