Questions From NCERT Textbook for Class 9 Science Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given atomic mass of Na = 23 u, Fe = 56 u)? If one mole of carbon atoms weigh 12 grams, what is the mass (in grams) of 1 atom of carbon? Question 2.Calculate the formula unit masses of ZnO, Na 2O, K 2C0 3, given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u. Calculate the molecular masses of H 2, O 2, Cl 2, C0 2, CH 4, C 2H 2,NH 3, CH 3OH. What is meant by the term chemical formula?Īnswer: The chemical formula of the compound is a symbolic representation of its composition, e.g., chemical formula of sodium chloride is NaCl. Why is it not possible to see an atom with naked eyes?Īnswer: Atom is too small to be seen with naked eyes. The relative atomic masses of all elements have been found with respect to an atom of carbon-12. Which postulate of Dalton’s atomic theory can explain the law of definite proportions?Īnswer: The relative number and kinds of atoms are constant in a given compound.Īnswer: One atomic mass unit is equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12. Atoms cannot be created nor destroyed in a chemical reaction. Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?Īnswer: The postulate of Dalton’s atomic theory that is the result of the law of conservation of mass is-the relative number and kinds of atoms are constant in a given compound. ∴ 24 g of oxygen gas would be required to react completely with 3 g of hydrogen gas.įormulae Handbook for Class 9 Maths and Science Educational Loans in India What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?Īnswer: Ratio of H : O by mass in water is: Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. Show that these observations are in agreement with the law of conservation of mass carbonate. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium etkanoate. In a reaction 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. Show that these observations are in agreement with the law of conservation of mass carbonate.ĬBSE Class 9 Science Chapter 3 IN-TEXT QUESTIONS SOLVED The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Here we have given Class 9 NCERT Science Text book Solutions for Chapter 1 matter in our Surroundings. These solutions are part of NCERT Solutions for Class 9 Science. Topics and Sub Topics in Class 9 Science Chapter 3 Atoms and Molecules: NCERT Solutions For Class 9 Science Chapter 3 Atoms and Molecules For a better understanding of this chapter, you should also see Chapter 3 Atoms and Molecules Class 9 notes, Science. Here you can get complete NCERT Solutions for Class 9 Science Chapter 3 Atoms and Molecules in one place. After you have studied lesson, you must be looking for answers of its questions. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 3 Atoms and Molecules. This solution contains questions, answers, images, step by step explanations of the complete Chapter 3 titled Atoms and Molecules of Science taught in class 9. NCERT Solutions Class 9 Science Chapter 3 Atoms and Molecules – Here are all the NCERT solutions for Class 9 Science Chapter 3.
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