BasicsStoichiometry #Atomic Structure#Subatomic Particles21Choose the best answerAn atom has atomic number 35 and mass number 80. Which option gives its correct composition?A35 protons, 35 electrons, 45 neutronsB35 protons, 35 electrons, 80 neutronsC35 protons, 36 electrons, 45 neutronsD35 protons, 36 electrons, 80 neutrons Like 0 Discuss 0Share
BasicsStoichiometry #Atomic Structure#Isotopes22Choose the best answerWhy is the atomic mass of chlorine about 35.5 u?AIt has only one isotopeBIt exists as isotopes of Cl-35 and Cl-37CIt is found in equal proportionsDIt has an atomic number of 17 Like 0 Discuss 0Share
BasicsStoichiometry #Mole Concept23Choose the best answerWhat is the mass of one-fourth gram-atom of Mg? (Atomic mass of Mg = 24)A24 amuB12 gC6 amuD6 g Like 0 Discuss 0Share
BasicsStoichiometry #Physical and Chemical Changes24Choose the best answerWhich change leaves the chemical composition of a substance unchanged?APhysical changeBChemical changeCNuclear changeDAtomic change Like 0 Discuss 0Share
BasicsStoichiometry #Gas Laws#Gases25Choose the best answerAt the same temperature and pressure, which gas sample occupies the least volume?A5 NA H₂B10 NA O₂C2.5 NA CO₂D20 NA N₂O Like 0 Discuss 0Share