Stoichiometry Stoichiometry MCQS#Pure Substances16Choose the best answerWhich option represents a pure substance?AAirBMilkCSodium chlorideDSoil Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isobars17Choose the best answerWhich of these pairs is an example of isobars?A¹²C and ¹⁴NB¹⁶O and ¹⁸OC³⁵Cl and ³⁷ClD⁴⁰Ca and ⁴⁰Ar Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Avogadro's Number18Choose the best answerIf Avogadro’s number changed from 6.022 × 10²³ mol⁻¹ to 6.022 × 10²⁰ mol⁻¹, which quantity would change?AThe definition of mass in units of grams.BThe mass of one mole of carbon.CThe ratio of chemical species in a balanced equation.DThe ratio of elements in a compound. Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Mole Concept19Choose the best answerWhich sequence correctly represents atom → molecule → compound?AHe → O₂ → OBNa → H₂ → H₂OCO → O₂ → ODH → H₂O → H₂ Like 0 Discuss 0Share2
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes20Choose the best answerAn element has isotopes of 10 u (90%) and 20 u (10%). What is its average atomic mass?A10 uB11 uC15 uD20 u Like 0 Discuss 0Share