BasicsStoichiometry #Molecular Mass101Choose the best answerWhich substance has numerically equal molecular mass and formula mass?ACaCO₃BMgOCNH₃DCaCO₃ and MgO Like 0 Discuss 0Share
BasicsStoichiometry #Atomic Mass Unit102Choose the best answer1/N_A gram is approximately equal to:AApproximately the mass of a protonBMolar massCAtomic mass unit (amu)DA and C Like 0 Discuss 0Share
BasicsStoichiometry #Elements103Choose the best answerWhich statement correctly describes an element?AIt contains only one type of atomBIt can be broken into simpler substances by ordinary chemical reactionsCIt must always exist as moleculesDIt is always a metal Like 0 Discuss 0Share
BasicsStoichiometry #Formula Mass104Choose the best answerWhich substance should be described using formula mass rather than molecular mass?AH₂OBCO₂CNaClDC₆H₁₂O₆ Like 0 Discuss 0Share
BasicsStoichiometry #Physical and Chemical Changes105Choose the best answerWhich change leaves the chemical composition of a substance unchanged?APhysical changeBChemical changeCNuclear changeDAtomic change Like 0 Discuss 0Share