Stoichiometry Stoichiometry MCQS#Atomic Mass Unit36Choose 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 Changes37Choose 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
Stoichiometry Stoichiometry MCQS#Atomic Mass Conversion38Choose the best answerA hydrogen atom has a mass of 1.008 u. What is its mass in kilograms?A1.008 × 1.661 × 10⁻²³ kgB1.008 × 1.661 × 10⁻²⁷ kgC1.008 ÷ 1.661 × 10⁻²⁷ kgD1.661 × 10⁻²⁷ kg Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Mass Comparison39Choose the best answerAn atom of X has mass 2 u and an atom of Y has mass 16 u. Which statement is correct?AOne atom of Y is 8 times heavier than one atom of XBOne mole of Y is 8 times heavier than one mole of XCBoth A and BDNeither A nor B Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Mass Comparison40Choose the best answerElements A and B have atomic masses 10 u and 20 u. Which statement must be true?AA has half the number of protons of B.BA has half the number of neutrons of B.COne atom of B is twice as heavy as one atom of A.DAtomic masses of A and B are unrelated to their relative masses. Like 0 Discuss 0Share