Stoichiometry 11#Elements and Molecules41Choose the best answerWhich pair contains molecules of elements rather than compounds?AO₂ and N₂BH₂O and CO₂CNH₃ and CH₄DHCl and H₂O Like 0 Discuss 0Share
Stoichiometry 11#Physical and Chemical Changes42Choose the best answerWhich process represents only a physical change?ARusting of ironBCombustion of magnesium ribbonCBurning of candleDMelting of wax Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Physical Changes43Choose the best answerWhich change can be reversed without forming a new substance?ABurning paperBMelting iceCRusting ironDCooking an egg Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Mass Unit44Choose the best answerOne atomic mass unit (1 u) is defined as:A1/16 of the mass of one oxygen-16 atomB1/12 of the mass of one carbon-12 atomC1/14 of the mass of one nitrogen-14 atomD1/10 of the mass of one neon-20 atom Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Chemical Changes45Choose the best answerWhich observation is the strongest evidence that a chemical reaction has occurred?AA substance changes its shapeBA new gas is formed during the reactionCA solid is broken into smaller piecesDSugar dissolves in water Like 0 Discuss 0Share