Stoichiometry 11#Atomic Structure#Isotopes11Choose the best answerHow is atomic mass in amu related to natural isotopes?Aamu ignores isotopes.Bamu depends on only one isotope of each element.CAtomic mass in amu reflects the weighted contribution of all naturally occurring isotopes.Damu is calculated using only neutrons. Like 0 Discuss 0Share
Stoichiometry 11#Physical and Chemical Changes12Choose the best answerWhich option represents a chemical change?ATwinkling of starsBCooking of vegetablesCCutting of fruitsDBoiling of water Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Avogadro's Number13Choose 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 Concept14Choose 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#Isotopes15Choose 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