Fundamental Concepts of ChemistryTemperature Scale Conversion31Choose the best answerConvert 70°C into kelvin:A283 KB300 KC343 KD350 K Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChemical Changes32Choose 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 Changes33Choose 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
Fundamental Concepts of ChemistryEnergy Changes in Physical Changes34Choose the best answerWhich statement about energy changes during a physical change is correct?AEnergy never changesBEnergy is always absorbedCEnergy is always releasedDEnergy may be absorbed or released Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChanges of State35Choose the best answerSolid → Liquid → Gas represents which sequence of physical changes?AFreezing → BoilingBMelting → BoilingCSublimation → DepositionDMelting → Freezing Like 0 Discuss 0Share