StoichiometryAvogadro's Law26Choose the best answerEqual 100 mL samples of O₂, NH₃ and CO₂ are taken at the same temperature and pressure. Their numbers of molecules are:ACO₂ < O₂ < NH₃BNH₃ < CO₂ < O₂CEqualDNH₃ = CO₂ < O₂ Like 0 Discuss 0Share
StoichiometryMass–Mass Stoichiometry27Choose the best answerHow many grams of O₂ are required to produce 1.8 g H₂O? 2H₂ + O₂ → 2H₂OA32 gB16 gC1.6 gDNone of these Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChemical Changes28Choose the best answerWhich is a characteristic of a chemical change?AFormation of one or more new substancesBNo energy change can occurCChemical composition remains unchangedDOnly the physical state changes Like 0 Discuss 0Share
StoichiometryBalancing Chemical Equations29Choose the best answerWhen the equation: C₄H₁₀ + O₂ → CO₂ + H₂O is balanced using the smallest whole-number coefficients, the coefficient of O₂ is:A3B7C9D13 Like 0 Discuss 0Share
Fundamental Concepts of ChemistryPhysical and Chemical Changes30Choose the best answerWhich of the following are chemical processes? (1) Rusting of a nail (2) Freezing of water (3) Decomposition of water into H₂ and O₂ (4) Compression of O₂ gasA2, 3 and 4B1, 3 and 4C1 and 3D1 and 2 Like 0 Discuss 0Share