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MCQ Questions for Class 9 Science Chapter 4 Structure of The Atom with Answers July 18, 2020 by Kishen Leave a Comment MCQs from Class 9 Science Chapter 4 – Structure of The Atom are provided here to help students prepare for their upcoming Science exam. The combining power of an element is known as its . rlmackin. About Atoms and Molecules Home Smart Class KG Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8 Class 9 Class 10 Class 12 Online Labs Class 9 Class 10 Class 11 Class 12 Feedback Words … 73% average accuracy. (c) Law of conservation of mass and Law of constant proportion, ► (c) Law of conservation of mass and Law of constant proportion. (d) The density of the reactants must equal the density of the products. What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules? Calculate the formula unit mass of ZnCl. 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