StoichiometryNumber of Atoms in a Given Mass241Choose the best answerWhich 1 g sample contains the greatest number of atoms?ANiBCaCN₂DB Like 0 Discuss 0Share
Stoichiometry 11#Elements and Molecules242Choose the best answerWhich pair contains molecules of elements rather than compounds?AO₂ and N₂BH₂O and CO₂CNH₃ and CH₄DHCl and H₂O Like 0 Discuss 0Share
StoichiometryGas Volume, Mass and Molar Mass243Choose the best answerFor equal masses of O₂, H₂ and CH₄ at the same temperature and pressure, the volume ratio O₂ : H₂ : CH₄ is:A1 : 1 : 1B1 : 16 : 2C2 : 16 : 2D2 : 16 : 1 Like 0 Discuss 0Share
Stoichiometry 11#Physical and Chemical Changes244Choose the best answerWhich process represents only a physical change?ARusting of ironBCombustion of magnesium ribbonCBurning of candleDMelting of wax Like 0 Discuss 0Share
StoichiometryGas Density at STP245Choose the best answerWhat is the mass of 1 dm³ CO₂ at STP (273 K and 1 atm)?A2.4 gB4.2 gC6.45 gD1.96 g Like 0 Discuss 0Share