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5.3 g of sodium carbonate and 6.0 g of acetic acid react to produce 2.2 g of carbon dioxide, 0.9 g of water and 8.2 g of sodium acetate. Verify whether the law of conservation of mass is valid.
The total mass of the reactants is obtained by adding 5.3 g of sodium carbonate and 6.0 g of acetic acid, giving 11.3 g. The total mass of the products is found by adding 2.2 g of carbon dioxide, 0.9 g of water and 8.2 g of sodium acetate, also giving 11.3 g. Because the mass of reactants equals theRead more
The total mass of the reactants is obtained by adding 5.3 g of sodium carbonate and 6.0 g of acetic acid, giving 11.3 g. The total mass of the products is found by adding 2.2 g of carbon dioxide, 0.9 g of water and 8.2 g of sodium acetate, also giving 11.3 g. Because the mass of reactants equals the mass of products, the reaction obeys the law of conservation of mass.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessIf a species has 11 protons, 12 neutrons and 10 electrons then (i) what is its atomic number and mass number? (ii) is it neutral, a cation or an anion? Explain. (iii) write its electronic configuration. (iv) name the species.
The atomic number is equal to 11 protons and the mass number equals 11 protons plus 12 neutrons, which is 23. It is a cation carrying a single positive charge because it contains 11 positive protons and only 10 negative electrons. Its 10 electrons are arranged with the electronic configuration 2, 8.Read more
The atomic number is equal to 11 protons and the mass number equals 11 protons plus 12 neutrons, which is 23. It is a cation carrying a single positive charge because it contains 11 positive protons and only 10 negative electrons. Its 10 electrons are arranged with the electronic configuration 2, 8. Therefore, this chemical species is the sodium cation, represented as Na+.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessTwo elements, A and B, have the following configurations A: 2, 8, 5 B: 2, 8, 7 (i) Which element is more reactive? (ii) Will A and B form ionic or covalent bonds when they combine? Explain using electron transfer or sharing. (iii) Predict the formula of the compound they would form.
Element B is more reactive than A because gaining one electron to complete an octet requires less energy than acquiring three electrons. Both A and B are non-metals with high electronegativity, so neither completely transfers electrons. Instead, one atom of A shares three electron pairs with three aRead more
Element B is more reactive than A because gaining one electron to complete an octet requires less energy than acquiring three electrons. Both A and B are non-metals with high electronegativity, so neither completely transfers electrons. Instead, one atom of A shares three electron pairs with three atoms of B, creating three covalent bonds. The resulting stable covalent compound has the chemical formula AB3.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessAssertion (A): Copper sulfate conducts electricity in the molten state but not in the solid state. Reason (R): Copper and sulfate ions are fixed in the lattice in molten state, while in solid state they can move freely. Choose the correct option: (i) Both A and R are true and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
Option (iii) is correct. Assertion A is true because copper sulfate is an ionic compound whose ions become free to move and conduct electricity when melted. Reason R is completely false because ions are tightly held in fixed positions within the solid crystal lattice, whereas they become mobile onlyRead more
Option (iii) is correct. Assertion A is true because copper sulfate is an ionic compound whose ions become free to move and conduct electricity when melted. Reason R is completely false because ions are tightly held in fixed positions within the solid crystal lattice, whereas they become mobile only in the molten state or aqueous solution to conduct electric current.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessThe species 27Al, 80Br- and 201Hg2+ have 13, 35 and 80 protons, respectively. How many electrons and neutrons do they have?
For neutral 27Al, electrons equal protons giving 13 and neutrons equal 27 minus 13, which is 14. For 80Br-, gaining one electron gives 35 plus 1, which is 36 electrons and neutrons equal 80 minus 35, giving 45. For 201Hg2+, losing two electrons gives 80 minus 2, which is 78 electrons and neutrons eqRead more
For neutral 27Al, electrons equal protons giving 13 and neutrons equal 27 minus 13, which is 14. For 80Br-, gaining one electron gives 35 plus 1, which is 36 electrons and neutrons equal 80 minus 35, giving 45. For 201Hg2+, losing two electrons gives 80 minus 2, which is 78 electrons and neutrons equal 201 minus 80, which is 121.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
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