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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
Define mole concept?
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
what are the limitations of dalton's atomic theory?
gve list of monovalent cations/anions
diavalent cations /anions
trivalent cations/anions.
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 mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
What is the difference between O2 and 2O?
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
Convert 10g of oxygen gas into no. of moles.
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 number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
valency table
How many times heavier is one atom of carbon than one atom of oxygen?
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
give me a list of atomicity of all elements
how many moles are present in 9g of water
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
prove the formula K.E.=1/2mv2
calculate the molar mass of CO2, H2SO4, NaCl?
what are the first 20 elements in the periodic table in order along with thier atomic and mass number?
what is meant by tetra atomic and poly atomic?
I want all elements' symbols with their valencies and atomicity.
The following questions are about one mole of sulphuric acid {H2SO4}?
Calculate the number of moles in 52 g of helium gas ?
what are polyatomic ions?give examples
1) calculate the number of molecules in 50g of calcium carbonate
2) calculate the number of moles for the following.
a.64g of oxygen atom
b.24*10 powered by 23 number of oxygen atom
3)calculate the formula unitmass of
a) calcium chloride b) sodium sulphite c) ammonium carbonate
4) calculate the no. of moles sulphur (Sg) present in 16g of solid sulphur
5) write the chemical formula using criss cross method
a)ammonium sulphate b)sodium sulphate c) barium nitrate
what is the difference between nitrate,nitride,nitrite?
S-2 has complete;y filled with K,L and M shells.Find its atomic number..
what were the drawbacks of Daltons atomic theory?
what is the molar mass of Na2SO3?
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
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
how to write the chemical formula of sodium bicarbonate by criss cross method?
what is the atomicity of phosphorous?and valency?
explain dalton's atomic theory and write its drawbacks
write the name of the compound (NH4)2SO4 and mention the ion present in it(3 mark)
Is there any trick to learn Valency?
How to solve numericals based on the mole concept?
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
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)
Q. How many molecules are present in 1 ml of water..? explain
give 2 examples of polyatomic elements
difference between molecular mass formula unit mass.
For hydrogen peroxide H2O2,
why he 2's are not cancelled.
Why it is not just HO?
What is special about it?
DEFINE MOLE CONCEPT & ITS FORMULAS?
/
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
How many atoms of each element are present in 6.3g of nitric acid (HNO3) ?
What is the difference between 2N and N2 ?
Oxygen is a electronegative element or electropositive element? Give reasons to support your answer.
srisaji@yahoo.com
what are alkalis give 2 examples
calculate the no. of atoms in 0.8 g of iron. (Fe=56)
what is the differences between 2H and H2 ?
Calculate the mass of one atom of sodium.
an element y forms an oxide with formula y2O3.
1)what is the valency ofy?
2)write the formula of chloride of y and sulphate of y
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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
a,18g of water h2o.
b.18g of oxygen o2.
c. 18g of carbon dioxide CO2.
d.18g of mithane CH4
Define mole concept?
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
what are the limitations of dalton's atomic theory?
0.4 mole of CO2 (At Mass of C = 12 &O=16 a.m.u) (17.6g)
gve list of monovalent cations/anions
diavalent cations /anions
trivalent cations/anions.
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 mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
What is the difference between O2 and 2O?
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
Convert 10g of oxygen gas into no. of moles.
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 number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
valency table
How many times heavier is one atom of carbon than one atom of oxygen?
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
give me a list of atomicity of all elements
how many moles are present in 9g of water
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
i) 46 grams of Na atoms (NUMBER FROM MASS)
ii) 8 grams of O2molecules (NUMBER OF MOLECULE FROM MASS)
iii) 0.1 mole of carbon atoms (NUMBER OF GIVEN MOLES)
prove the formula K.E.=1/2mv2
calculate the molar mass of CO2, H2SO4, NaCl?
what are the first 20 elements in the periodic table in order along with thier atomic and mass number?
what is meant by tetra atomic and poly atomic?
I want all elements' symbols with their valencies and atomicity.
The following questions are about one mole of sulphuric acid {H2SO4}?
Calculate the number of moles in 52 g of helium gas ?
what are polyatomic ions?give examples
1) calculate the number of molecules in 50g of calcium carbonate
2) calculate the number of moles for the following.
a.64g of oxygen atom
b.24*10 powered by 23 number of oxygen atom
3)calculate the formula unitmass of
a) calcium chloride b) sodium sulphite c) ammonium carbonate
4) calculate the no. of moles sulphur (Sg) present in 16g of solid sulphur
5) write the chemical formula using criss cross method
a)ammonium sulphate b)sodium sulphate c) barium nitrate
what is the difference between nitrate,nitride,nitrite?
S-2 has complete;y filled with K,L and M shells.Find its atomic number..
what were the drawbacks of Daltons atomic theory?
what is the molar mass of Na2SO3?
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
What do the following abbreviations stand for
O
2O
O2
3O2
a) Mg(NO3)2
b) K2SO4
c) Ca3N2
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
how to write the chemical formula of sodium bicarbonate by criss cross method?
what is the atomicity of phosphorous?and valency?
1) Identify X,Y and Z.
2) Write the electronic configuration of X and Y.
3) Write the atomicity of the molecule Z.
explain dalton's atomic theory and write its drawbacks
write the name of the compound (NH4)2SO4 and mention the ion present in it(3 mark)
Is there any trick to learn Valency?
How to solve numericals based on the mole concept?
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
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?
a) Molecules having one kind of atoms only.
b) Molecules having two different kinds of atoms.
c) Molecules having three different kinds of toms.
calculate the number of moles in 22g of carbondioxide?
Q. An element M forms the oxide . What will be the formula of its sulphate.
Calculate mass of 3.011 X 10 23no of nitrogen atoms ( atomic mass of N = 14 u)
Q. How many molecules are present in 1 ml of water..? explain
give 2 examples of polyatomic elements
N2 + 3H2 ―>2NH3
difference between molecular mass formula unit mass.
For hydrogen peroxide H2O2,
why he 2's are not cancelled.
Why it is not just HO?
What is special about it?
DEFINE MOLE CONCEPT & ITS FORMULAS?
/
Is there any difference between molar mass and molecular mass?If yes then how
Ca2+, K+, Fe3+, Cl-, SO42-
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.
Given, H=1,O=16
(1)Water (H2O)
(2) Hydrogen peroxide (H2O2)
GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS
i) Fe3+ and So4 2- ii) NH4 +1 and CO3 2-
I want only this answer to be solved no other links which shows different:))
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
How many atoms of each element are present in 6.3g of nitric acid (HNO3) ?
What is the difference between 2N and N2 ?
Oxygen is a electronegative element or electropositive element? Give reasons to support your answer.
srisaji@yahoo.com
what are alkalis give 2 examples
calculate the no. of atoms in 0.8 g of iron. (Fe=56)
what is the differences between 2H and H2 ?
1) aluminium cyanide
2) magnesium chlorate
3) ammonium sulphate
4) iron (II) oxide
5) potassium di chromate
6) hydrogen nitrate
Calculate the mass of one atom of sodium.
an element y forms an oxide with formula y2O3.
1)what is the valency ofy?
2)write the formula of chloride of y and sulphate of y