REVISION WORKSHEET
CLASS 9
1.What is atomic mass unit?
2.Determine the valency of the given elements.
(i) Chlorine (17) (ii) Sulphur (16)(iii) Aluminium(13)
3.with example explain the law of constant propotion.
4.Na+ has completely filled K and L shells.Explain
5.give uses of any three isotopes
6.An element has atomic number 12 and atomic mass 26. draw a diagram to show the distribution of electrons in the orbits and the nucleus composition of the element. what is the valency of the element.
7.What are isobars? Give one example
8.Write the chemical formulas of the following compounds
(i) Aluminium nitride
(ii)Ammonium phosphate
9.calculate the no.of moles in 32g of oxygen gas.
10.Determine the molecular mass of CaCO3 and Al(OH)3
11.write the postulates of Bohr's Model of an atom.
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CLASS 9
1.What is atomic mass unit?
2.Determine the valency of the given elements.
(i) Chlorine (17) (ii) Sulphur (16)(iii) Aluminium(13)
3.with example explain the law of constant propotion.
4.Na+ has completely filled K and L shells.Explain
5.give uses of any three isotopes
6.An element has atomic number 12 and atomic mass 26. draw a diagram to show the distribution of electrons in the orbits and the nucleus composition of the element. what is the valency of the element.
7.What are isobars? Give one example
8.Write the chemical formulas of the following compounds
(i) Aluminium nitride
(ii)Ammonium phosphate
9.calculate the no.of moles in 32g of oxygen gas.
10.Determine the molecular mass of CaCO3 and Al(OH)3
11.write the postulates of Bohr's Model of an atom.
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