BasicsStoichiometry #Atom#Atomic Structure11Choose the best answerWhat is the smallest unit of an element that retains its chemical properties?AAtomBMoleculeCCompoundDIon Like 0 Discuss 0Share
BasicsStoichiometry #Mole Concept12Choose the best answerWhich statement is true for 1 mol of O₂ and 1 mol of CO₂?AThey have the same massBThey contain the same number of moleculesCThey contain the same total number of atomsDThey contain the same number of electrons Like 0 Discuss 0Share
BasicsStoichiometry #Elements13Choose 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 #Mole Concept14Choose the best answerHow many moles of phosphorus atoms are present in 0.25 mol of P₄?A0.25 molB0.50 molC1.00 molD4.00 mol Like 0 Discuss 0Share
BasicsStoichiometry #Avogadro's Number15Choose the best answerHow many electrons are present in one mole of electrons?A1 electronB6.02 × 10²³ coulombsC6.02 × 10²³ electronsD1 gram of electrons Like 0 Discuss 0Share