StoichiometryMass–Mole Stoichiometry1Choose the best answer12 g Mg reacts completely with excess acid: Mg + 2H⁺ → Mg²⁺ + H₂ Approximately how many moles of H₂ are produced?A1 molB0.5 molC2/3 molDNone of these Like 0 Discuss 0Share
Fundamental Concepts of ChemistryReversible Physical Changes2Choose the best answerWhich description best represents a reversible physical change?APermanent and reversibleBTemporary and irreversibleCTemporary and reversibleDPermanent and irreversible Like 4 Discuss 0Share
StoichiometryMole Concept and Mass Comparison3Choose the best answerConsider: I. 2.5 mol CH₄ II. 22.4 dm³ O₂ at STP III. 6.02 × 10²² C atoms IV. 3.5 mol He What is the increasing order of their masses?AI < II < III < IVBIV < III < II < ICIII < IV < II < IDII < I < III < IV Like 1 Discuss 0Share
Fundamental Concepts of ChemistryChemical Changes4Choose the best answerWhich is an example of a chemical change?ABoiling of waterBBurning of paperCEvaporation of waterDMelting of ice Like 0 Discuss 0Share
StoichiometryMolar Mass5Choose the best answerOne gram-mole of which pair has equal mass?ANO₂ and CO₂BNa and NH₃CCH₄ and O₂DN₂ and CO Like 11 Discuss 0Share1