Login
Login
Register
Questions
Unanswered
Tags
Categories
Ask a Question
Ask a Question
Recent questions tagged atoms and molecules
+1
vote
1
answer
(a) Calculate the number of ***** in 112 g of iron. (b) Calculate the mass of 0.5 ***** of sugar (C12H22O11).
asked
Apr 7, 2019
in
Chemistry
by
kratos
basic concepts of chemistry
cbse
class-11
class-9
atoms and molecules
+2
votes
1
answer
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23u, Fe =56 u)?
asked
Apr 6, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+1
vote
1
answer
Mass of one molecule of a substance is 5.32 × 10^-23 g. What is its molecular mass ?
asked
Apr 6, 2019
in
Class 9
by
kratos
class-8
atoms and molecules
class-9
cbse
+1
vote
1
answer
Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH.
asked
Apr 4, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+1
vote
1
answer
All samples of carbon dioxide contain carbon and oxygen in the mass ratio 3 : 8. This is in agreement with the law of
asked
Apr 4, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+2
votes
1
answer
Raunak took 5 ***** of carbon atoms in a container and Krish also took 5 ***** of sodium atoms in another container of same weight
asked
Apr 4, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+1
vote
1
answer
Define atomic mass unit (a.m.u).
asked
Apr 3, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+3
votes
1
answer
Find the no of molecules and no of atoms present in 200gm of CaCO3
asked
Apr 3, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+2
votes
1
answer
Two elements $A' and $B' (atomic weights 75 and 16 respectively) combine to give a compound having 75.8% of $A'. The compound has the formula
asked
Mar 31, 2019
in
Chemistry
by
kratos
some basic concepts of chemistry
cbse
jee
class-9
jee mains
profit and loss
atoms and molecules
+1
vote
1
answer
Define valency
asked
Mar 31, 2019
in
Class 11
by
kratos
structure of the atom
atoms and molecules
class-11
class-7
class-8
chemical bonding
atomic structure
molecular structure
class-9
+1
vote
1
answer
Give one method for industrial preparation and one for laboratory preparation of CO and CO2 each.
asked
Mar 30, 2019
in
JEE
by
kratos
class-8
class-11
jee
hydrogen
jee mains
atoms and molecules
p - block element
+2
votes
1
answer
Match the following: 1.gram molecular (a) triatomic oxygen volume
asked
Mar 30, 2019
in
Class 9
by
kratos
atoms and molecules
class-8
class-9
+3
votes
1
answer
Calculate ΔG° for the reaction in Example 1, the decomposition of calcium carbonate, from ΔH° and ΔS° values.
asked
Mar 29, 2019
in
JEE
by
kratos
physical and chemical equilibrium
class-11
chemical thermodynamics
jee mains
atoms and molecules
jee
class-9
+1
vote
1
answer
State law of Chemical Combination.
asked
Mar 28, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+2
votes
1
answer
State Law of multiple proportion.
asked
Mar 27, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+1
vote
1
answer
Valency of iron
asked
Mar 26, 2019
in
Class 9
by
kratos
molecules
class-9
class-7
atomic structure
icse
atoms and molecules
atoms
+1
vote
1
answer
What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole of water molecules?
asked
Mar 24, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
+1
vote
1
answer
3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are
asked
Mar 24, 2019
in
Class 12
by
kratos
atoms and molecules
class-9
class-12
cbse
+1
vote
1
answer
Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH.
asked
Mar 22, 2019
in
Class 9
by
kratos
atoms and molecules
class-9
cbse
+2
votes
1
answer
1mole of a compound contains 1mole of carbon and 2moles of oxygen.
asked
Mar 22, 2019
in
Class 9
by
kratos
class-8
atoms and molecules
class-9
cbse
To see more, click for the
full list of questions
or
popular tags
.