Given below are the Class 9 Science CBSE Test Paper for Atoms and Molecules
a. Concepts questions
b. Calculation problems
c. Multiple choice questions
d. Long answer questions
e. Fill in the blanks
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State the law of mass conservation.
What do you understand by the law of constant proportion?
Who was responsible for coining the term atom?
What is an atom?
What is a molecule?
What is atomicity?
Define atomic mass unit.
Provide a difference between cations and anions, along with an example for each.
Define Avogadro’s constant.
(a)Explain how atoms exist.
(b)What do you understand by atomicity?
(c) Explain polyatomic ions.
Explain atomic mass and gram atomic mass. Why does mass have different expressions viz, ‘u’ and ‘gm’?
Define a mole. Give the importance of the mole.
How many molecules are present in 1 ml of water?
Calculate the molecular mass of glucose, C6H12O6.
O is the formula for water. What information do you get from this formula?
What is the formula unit mass of CaCl2
(Na = 23, Cl=35.5, Ca=40)
(i) Name the body which approves the nomenclature of elements and compounds.
(ii) The symbol of sodium is written as Na and not as S. Give reason.
(iii) Name one element which form diatomic and one which form tetra atomic molecules.
10.0 g CaCO3 on heating gave 4.4 g of CO2 and 5.6 g of CaO. Show that these observations are in agreement with law of conservation of mass.
Why are Dalton's symbol not used in chemistry?
What is the difference between2O, O2
(1) the mass of a single oxygen atom
(2) the mass of a single oxygen molecule
(3) the mass of a mole of oxygen gas
(4) the mass of an oxygen ion
(5) the number of atoms in a mole of an oxygen molecule.
What is the atomicity of oxygen and phosphorous?
How many moles of $SO_2$ have same mass as 3 moles of oxygen?
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Class 9 Maths
Class 9 Science