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WorksheetsSOME BASIC CONCEPTS OF CHEMISTRY
Total questions: 26
Worksheet time: 20mins
How many significant figures are present in 0.0025
Two
Three
Four
Five
Which of the following are true regarding Dalton's atomic theory? (Select all correct options)
It failed to explain the nature of forces that bind together atoms in a molecule.
It could not explain how and why atoms of different elements combine with each other to form compound atoms or molecules.
It completely explained why atoms of different elements have different masses, sizes, valencies, etc.
It explained the nature of forces that bind together atoms in a molecule.
The reactant which is entirely consumed when a reaction goes to completion is called
(a)
(a) refers to the agreement of a particular value to the true value of the result.
What is the unit of mole fraction
gram
Mole
Mol/L
Unitless
Which of the following reactions is not correct according to the law of
conservation of mass.
(i)
(ii)
(iii)
(iv)
2Mg(s) + O2(g) --> 2MgO(s)
C3H8(g) + O2(g) -->CO2(g) + H2O(g)
P4(s) + 5O2(g)--> P4O10(s)
CH4(g) + 2O2(g) --> CO2(g) + 2H2O (g)
Mass of 1 atom is known as
Atomic mass
Molecular mass
Molar mass
None of the above
Mass of 1 molecule is known as
Atomic mass
Molecular mass
Molar mass
None of the above
Mass of 1 mole particles is known as
Molar mass
Molecular mass
Atomic mass
None of the above
1 mole is equal to
Henry constant
Avogadro constant
Dalton constant
None of the above
Molecular mass of methane is
18u
16u
20u
None of the above
Molecular mass of water is
18u
16u
20u
None of the above
1 mole is equal to
22.2 L at stp
22.4 L at stp
20 L at stp
None of the above
1amu is
1/12 (weight of C-12 atom)
1/14 (weight of C-12 atom)
1/2 (weight of C-12 atom)
None of the
Calculate the molecular mass of sodium chloride
60 u
58 u
20 u
None of the above
What term is given to a compound which contains atoms of carbon and hydrogen only?
alkene
hydrocarbon
alkane
saturated
What term describes alkane molecules that contain C-C single bonds?
saturated
unsaturated
What are the 2 products of complete combustion?
carbon dioxide + hydrogen
carbon dioxide + water
carbon monoxide + water
carbon monoxide + hydrogen
Heptane
Octane
Hexane
Cyclohexane
If an alkane has 10 carbon atoms, how many hydrogen atoms will it have?
20
22
40
42
C3H8
Which of the following has the highest boiling point?
heptane
pentane
nonane
propane
butane
pentane
name the group that has a single bond
alkenes
alcohols
alkanes
ethers
