Chemistry is the science of molecules and their transformation.It is deals with the composition, structure and properties of matter
Chapter 1,
SOME BASIC CONCEPTS
Important questions ,
1.state and illustrated the low of multiple proportion
2.calcualte the amound of CO2(g)produced by the reaction of 32g of CH4 (g) and 32g of O2(g)
3.The number of oxygen atoms present in 5 moles of glucose (C6H12O6)is ......?
4.find the molecular formula of the combound with molar mass 78g 1/mol and empirical formula CH
5.calculate the mass of oxalic acid dehydrate [H2C2O4.2H2O] required to prepare 0.1M,250ml of its aqueous solution
6.NO and NO2 are two oxide of nitrogen
(a) state the low and which is the low of chemical combination is illustrated by these compounds
7.(a) Determine the number of moles present in 0.55 mg of electrons
i)1 mole ii) 2 moles iii)1.5 moles iv) 0.5 moles
(b) two elements carbons and hydrogen combine to form C2H6,C2H4 and C2H2 identify the law illustrate here
8. Empirical formula represents the simple whole number ratio of various atoms present in a compound
(a) given the relation between empirical formula and molecular formula
(b)An organic compound has the following percentage composition C=12.36% H=2.13% H=2.13% Br=85% Its vapours density is 94 . Find its molecular formula?
(c) what is the mole fraction?
9.Hydrogen combines with hydrogen to form two different compound namely water (H2O) and hydrogen peroxide (H2O2)
(a) which law is obeyed by this combination ?
(b)state the law?
(c) How many significant figur are present in following
i)0.0025 ii)285
10.A given compound alwys contain with exactly the same proportion of elements by weight
(a) (i)Name the above low
(ii)write the name of the scientist who proposed law
(b) calculate the number of molecule in each of the following
(i) 1g N2 (ii) 1g CO2
Molecular mass of N2=28 and CO2=44
11.howmany moles of dioxygen are present in 64g of dioxygen ?
12.Calculate the number of moles of oxygen required to produce 240g of MgO by burning Mg metals ?(atomic mass Mg=24,O=16)
13.If the mass percent of various element of a compound is known, its empirical formula can be calculated
(a)what is mass percent?
(b)Compound contain 4.07% Hydrogen, 24.27%carbon and 71.65% chlorine
Its molecular mass is 98.96 what are the empirical and molicular formula ?
14.One mole is the amound of substance that contain as many particles as 12 g of
C12 is isotope of carbon
(a) what di you mean by molar mass of compound ?
(b)Calculate the number of moles in 1L of
Water?
15.The law of chemical combination are the basis of atomic theory
(a)Name the law of chemical combination illustrated by the pair of compound CO and CO2
(b)State and explain the law of conservation of mass
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Chapter 1,
SOME BASIC CONCEPTS
Important questions ,
1.state and illustrated the low of multiple proportion
2.calcualte the amound of CO2(g)produced by the reaction of 32g of CH4 (g) and 32g of O2(g)
3.The number of oxygen atoms present in 5 moles of glucose (C6H12O6)is ......?
4.find the molecular formula of the combound with molar mass 78g 1/mol and empirical formula CH
5.calculate the mass of oxalic acid dehydrate [H2C2O4.2H2O] required to prepare 0.1M,250ml of its aqueous solution
6.NO and NO2 are two oxide of nitrogen
(a) state the low and which is the low of chemical combination is illustrated by these compounds
7.(a) Determine the number of moles present in 0.55 mg of electrons
i)1 mole ii) 2 moles iii)1.5 moles iv) 0.5 moles
(b) two elements carbons and hydrogen combine to form C2H6,C2H4 and C2H2 identify the law illustrate here
8. Empirical formula represents the simple whole number ratio of various atoms present in a compound
(a) given the relation between empirical formula and molecular formula
(b)An organic compound has the following percentage composition C=12.36% H=2.13% H=2.13% Br=85% Its vapours density is 94 . Find its molecular formula?
(c) what is the mole fraction?
9.Hydrogen combines with hydrogen to form two different compound namely water (H2O) and hydrogen peroxide (H2O2)
(a) which law is obeyed by this combination ?
(b)state the law?
(c) How many significant figur are present in following
i)0.0025 ii)285
10.A given compound alwys contain with exactly the same proportion of elements by weight
(a) (i)Name the above low
(ii)write the name of the scientist who proposed law
(b) calculate the number of molecule in each of the following
(i) 1g N2 (ii) 1g CO2
Molecular mass of N2=28 and CO2=44
11.howmany moles of dioxygen are present in 64g of dioxygen ?
12.Calculate the number of moles of oxygen required to produce 240g of MgO by burning Mg metals ?(atomic mass Mg=24,O=16)
13.If the mass percent of various element of a compound is known, its empirical formula can be calculated
(a)what is mass percent?
(b)Compound contain 4.07% Hydrogen, 24.27%carbon and 71.65% chlorine
Its molecular mass is 98.96 what are the empirical and molicular formula ?
14.One mole is the amound of substance that contain as many particles as 12 g of
C12 is isotope of carbon
(a) what di you mean by molar mass of compound ?
(b)Calculate the number of moles in 1L of
Water?
15.The law of chemical combination are the basis of atomic theory
(a)Name the law of chemical combination illustrated by the pair of compound CO and CO2
(b)State and explain the law of conservation of mass
Thank you for visiting my website
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