Select Board & Class
what is the diff between atoms and molecule?
Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,
Mn=55.0u, O=16.0u.
50 names of compounds and their chemical formula
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
Define mole concept?
what are the limitations of dalton's atomic theory?
gve list of monovalent cations/anions
diavalent cations /anions
trivalent cations/anions.
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
WHEN COPPER CARBONATE REACTS WITH HYDROCHLORIC ACID, ACCORDING TO ME THE PRODUCTS WILL BE COPPER CHLORIDE AND HYDROGEN CARBONATE.
CUCO3+HCL=CUCL+HCO3
BUT IT THE TEXTBOOKK ITS WRITTEN THAT THE PRODUCTS OF THIS REACTION IS COPPER CHLORIDE, CARBON DIOXIDE AND WATER. HOW IS THIS POSSIBLE
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
In this question why do we multiply the avagadro number? We are to find number of molecules, so why we take out moles?????????????? plzzzzzz reply
how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
how to calculate the valency of any compound?
calculate the molar mass of nitric acid HNO3 (H=1,N=14,O=16)
calculate the percentage of iron in potassium ferro cyanide K4 (Fe(CN)6)
[Fe=56, S=32, O=16, H=1, K=39, C=12, N=14]
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
the reciprocal of ____________ is called avogram
valency table
1) Atoms combine in the ration of small whole numbers to form compounds.
2) The relative number and kinds of atoms are constant in a given compound.
Please explain these 2 laws of Dalton's theory.
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
give me a list of atomicity of all elements
a flask contains 4.4g CO2 gas .calculate
how many moles of CO2 gas does it contain?
how many molecules of CO2 gas are present in the sample ?
how many atoms of oxygen are presnt in the given sample ?
From 200 mg of CO2 ,1021 molecules are removed.How many moles of CO2 are left ?
a) 0.288 b) 2.88 c) 0.00288 d) 0.0288
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
prove the formula K.E.=1/2mv2
For hydrogen peroxide H2O2,
why he 2's are not cancelled.
Why it is not just HO?
What is special about it?
calculate the molar mass of CO2, H2SO4, NaCl?
what is meant by tetra atomic and poly atomic?
calculate the number of molecules in 1ml of O2 at STP
I want all elements' symbols with their valencies and atomicity.
what happens in the reaction flask?
do you think that a chemical reaction has taken place?
why should we put a cork on the mouth of the flask?
does the mass of the flask and it s contents change?
Calculate the number of moles in 52 g of helium gas ?
Convert 10g of oxygen gas into no. of moles.
what are polyatomic ions?give examples
what is the difference between nitrate,nitride,nitrite?
144 grams of pure water is decomposed by passing electricity. 16 grams of hydrogen and 128 grams of oxygen are obtained. Which chemical law is illustrated by this statement?
what were the drawbacks of Daltons atomic theory?
if the isotopic distribution of C-12 and C-14 is 98% and 2% respectively, the number of C-14 atoms in 12 g of carbon is
a)1.032x1022
b)1.032 x 1023
c)3.88 x 1022
d)1.302 x 1022
and pls explain
Why are Dalton's symbols not used in Chemistry
What is the difference between O2 and 2O?
What do the following abbreviations stand for
O
2O
O2
3O2
if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....
why atomic mass of some element are in fraction
A reaction between sodium hydroxide and hydrogen chloride gas produces sodium chloride and water. A reaction of 22.85g of sodium hydroxide with 20.82g of hydrogen chloride gives offf 10.29g of water. What mass of sodium chloride is formed in the reaction?
what is the atomicity of phosphorous?and valency?
explain dalton's atomic theory and write its drawbacks
what is the valency of nitrite?
Is there any trick to learn Valency?
How to solve numericals based on the mole concept?
calculate the number of moles in 32g of methane.
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
A ball is dropped from a height of 10m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back ?
Why is valency of magnesium 2? How can we find the valency of an atom?
calculate the number of moles in 22g of carbondioxide?
Calculate mass of 3.011 X 10 23no of nitrogen atoms ( atomic mass of N = 14 u)
What does the following denote 2N , N2 , 2N2 , N.
Q. How many molecules are present in 1 ml of water..? explain
on analysis , it was found that the black oxide of copper , red oxide of copper , litherage, the red oxide of lead and peroxide of lead contain 79.90%, 88.8%, 92.88%, 90.6% and 86.6% respectively of the metal. establish the law of multiple proprotions with the help of data
give 2 examples of polyatomic elements
calculate the number of ions number of oxygen atoms, total charge in 3g of (co3)2
difference between molecular mass formula unit mass.
DEFINE MOLE CONCEPT & ITS FORMULAS?
/
A highly reactive element X is stored under water .It readily reacts with oxygen of air to give a compound Y which dissolves in water .The aqueous solution of Y changes blue litmus to red.The element X is a) Na b) S c) P d) K
Is there any difference between molar mass and molecular mass?If yes then how
Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide
Relative density of gold is 19.5.The density of water is 1000kg/m3.what will be the density of gold in S.I unit and in g/cc.
GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS
Chlorophyll contains 2.68% of magnesium by mass.Calculate the number of magnesium atoms in 3.00 g of chlorophyll
a) 1.98 * 1021 atoms b) 6.023 * 1023 atoms c) 1.7 * 1020 atoms d) 2.8 * 1022 atoms
What is the difference between 2N and N2 ?
Which of the following samples contains 2.0 * 1023 atoms ?
a) 8.0 g O2 b) 3.0 g Be c) 8.0 g C d) 19.0 g F2
srisaji@yahoo.com
what are alkalis give 2 examples
how many atoms are present in H2So4?
what is the differences between 2H and H2 ?
how many moles are present in 9g of water
Calculate the mass of one atom of sodium.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)
Syllabus
what is the diff between atoms and molecule?
Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,
Mn=55.0u, O=16.0u.
50 names of compounds and their chemical formula
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
Define mole concept?
what are the limitations of dalton's atomic theory?
gve list of monovalent cations/anions
diavalent cations /anions
trivalent cations/anions.
a,18g of water h2o.
b.18g of oxygen o2.
c. 18g of carbon dioxide CO2.
d.18g of mithane CH4
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
WHEN COPPER CARBONATE REACTS WITH HYDROCHLORIC ACID, ACCORDING TO ME THE PRODUCTS WILL BE COPPER CHLORIDE AND HYDROGEN CARBONATE.
CUCO3+HCL=CUCL+HCO3
BUT IT THE TEXTBOOKK ITS WRITTEN THAT THE PRODUCTS OF THIS REACTION IS COPPER CHLORIDE, CARBON DIOXIDE AND WATER. HOW IS THIS POSSIBLE
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
In this question why do we multiply the avagadro number? We are to find number of molecules, so why we take out moles?????????????? plzzzzzz reply
how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
how to calculate the valency of any compound?
calculate the molar mass of nitric acid HNO3 (H=1,N=14,O=16)
calculate the percentage of iron in potassium ferro cyanide K4 (Fe(CN)6)
[Fe=56, S=32, O=16, H=1, K=39, C=12, N=14]
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
the reciprocal of ____________ is called avogram
valency table
1) Atoms combine in the ration of small whole numbers to form compounds.
2) The relative number and kinds of atoms are constant in a given compound.
Please explain these 2 laws of Dalton's theory.
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
give me a list of atomicity of all elements
a flask contains 4.4g CO2 gas .calculate
how many moles of CO2 gas does it contain?
how many molecules of CO2 gas are present in the sample ?
how many atoms of oxygen are presnt in the given sample ?
From 200 mg of CO2 ,1021 molecules are removed.How many moles of CO2 are left ?
a) 0.288 b) 2.88 c) 0.00288 d) 0.0288
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
prove the formula K.E.=1/2mv2
For hydrogen peroxide H2O2,
why he 2's are not cancelled.
Why it is not just HO?
What is special about it?
calculate the molar mass of CO2, H2SO4, NaCl?
(A) Convection current
(B) Heat changes in liquid state
(C) Impact of molecules of dispersion medium on colloidal particles
(D) Attractive forces between particles of dispersed phase and dispersion medium
what is meant by tetra atomic and poly atomic?
calculate the number of molecules in 1ml of O2 at STP
I want all elements' symbols with their valencies and atomicity.
what happens in the reaction flask?
do you think that a chemical reaction has taken place?
why should we put a cork on the mouth of the flask?
does the mass of the flask and it s contents change?
Calculate the number of moles in 52 g of helium gas ?
Convert 10g of oxygen gas into no. of moles.
what are polyatomic ions?give examples
what is the difference between nitrate,nitride,nitrite?
144 grams of pure water is decomposed by passing electricity. 16 grams of hydrogen and 128 grams of oxygen are obtained. Which chemical law is illustrated by this statement?
what were the drawbacks of Daltons atomic theory?
0.4 mole of CO2 (At Mass of C = 12 &O=16 a.m.u) (17.6g)
if the isotopic distribution of C-12 and C-14 is 98% and 2% respectively, the number of C-14 atoms in 12 g of carbon is
a)1.032x1022
b)1.032 x 1023
c)3.88 x 1022
d)1.302 x 1022
and pls explain
Why are Dalton's symbols not used in Chemistry
What is the difference between O2 and 2O?
What do the following abbreviations stand for
O
2O
O2
3O2
if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....
why atomic mass of some element are in fraction
A reaction between sodium hydroxide and hydrogen chloride gas produces sodium chloride and water. A reaction of 22.85g of sodium hydroxide with 20.82g of hydrogen chloride gives offf 10.29g of water. What mass of sodium chloride is formed in the reaction?
what is the atomicity of phosphorous?and valency?
explain dalton's atomic theory and write its drawbacks
what is the valency of nitrite?
Is there any trick to learn Valency?
How to solve numericals based on the mole concept?
calculate the number of moles in 32g of methane.
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
A ball is dropped from a height of 10m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back ?
Why is valency of magnesium 2? How can we find the valency of an atom?
calculate the number of moles in 22g of carbondioxide?
Calculate mass of 3.011 X 10 23no of nitrogen atoms ( atomic mass of N = 14 u)
What does the following denote 2N , N2 , 2N2 , N.
Q. How many molecules are present in 1 ml of water..? explain
on analysis , it was found that the black oxide of copper , red oxide of copper , litherage, the red oxide of lead and peroxide of lead contain 79.90%, 88.8%, 92.88%, 90.6% and 86.6% respectively of the metal. establish the law of multiple proprotions with the help of data
give 2 examples of polyatomic elements
calculate the number of ions number of oxygen atoms, total charge in 3g of (co3)2
difference between molecular mass formula unit mass.
a...FeSO4
b...CH3COOK
DEFINE MOLE CONCEPT & ITS FORMULAS?
/
A highly reactive element X is stored under water .It readily reacts with oxygen of air to give a compound Y which dissolves in water .The aqueous solution of Y changes blue litmus to red.The element X is a) Na b) S c) P d) K
Is there any difference between molar mass and molecular mass?If yes then how
Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide
Relative density of gold is 19.5.The density of water is 1000kg/m3.what will be the density of gold in S.I unit and in g/cc.
GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS
a) What is the colour of the compound formed ?
b) Write the effect of magnet on it .
c) Write the action of carbon disulphide on it .
d) Describe the effect of adding dilute hydrochloric acid to it . Identify the gas and write its two properties .
{ please answer this fast as it is very urgent }
Chlorophyll contains 2.68% of magnesium by mass.Calculate the number of magnesium atoms in 3.00 g of chlorophyll
a) 1.98 * 1021 atoms b) 6.023 * 1023 atoms c) 1.7 * 1020 atoms d) 2.8 * 1022 atoms
(1) Ammonium (2) Sulphite
(3) Sulphate (4) Sulphide
What is the difference between 2N and N2 ?
Which of the following samples contains 2.0 * 1023 atoms ?
a) 8.0 g O2 b) 3.0 g Be c) 8.0 g C d) 19.0 g F2
srisaji@yahoo.com
monoxide.
carbon combines with 4/3 times its mass of oxygen to form carbon .How?????????? i need the answer in simple language for me to understand
what are alkalis give 2 examples
how many atoms are present in H2So4?
what is the differences between 2H and H2 ?
how many moles are present in 9g of water
Calculate the mass of one atom of sodium.