Stoichiometry 11#Atomic Structure#Isobars16Choose the best answerWhich pair consists of isobars?A¹²C and ¹⁴NB¹⁶O and ¹⁸OC³⁵Cl and ³⁷ClD⁴⁰Ca and ⁴⁰Ar Like 0 Discuss 0Share
Stoichiometry 11#Elements and Molecules17Choose 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 Changes18Choose the best answerWhich process represents only a physical change?ARusting of ironBCombustion of magnesium ribbonCBurning of candleDMelting of wax Like 0 Discuss 0Share
Stoichiometry 11#Atomic Mass Conversion19Choose the best answerWhat is the approximate mass of one ²³Na atom in kilograms?A3.82 × 10⁻²⁶ kgB2.30 × 10⁻²⁶ kgC1.66 × 10⁻²⁷ kgD3.82 × 10⁻²³ kg Like 0 Discuss 0Share
Stoichiometry 11#Atomic Structure#Isotopes20Choose the best answerAn element contains 75% of an isotope of mass 24 u and 25% of an isotope of mass 26 u. What is its relative atomic mass?A24.0B24.5C25.0D25.5 Like 0 Discuss 0Share