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Syllabus

what is the diff between atoms and molecule?

50 names of compounds and their chemical formula

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,N_{A}=6.022 * 10^{23 }mol^{ -1]}Calculate the number of molecules of sulphur (S

_{8}) 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 mass of 1 atom of silver and 1 molecule of carbon dioxide.

valency table

calculate the no. of aluminium ions present in 0.051g of aluminium oxide

give me a list of atomicity of all elements

From 200 mg of CO

_{2},10^{21}molecules are removed.How many moles of CO_{2}are left ?a) 0.288 b) 2.88 c) 0.00288 d) 0.0288

prove the formula K.E.=1/2mv

^{2}calculate the molar mass of CO2, H2SO4, NaCl?

what is meant by tetra atomic and poly atomic?I want all elements' symbols with their valencies and atomicity.

Calculate the number of moles in 52 g of helium gas ?

what are polyatomic ions?give examples

what is the difference between nitrate,nitride,nitrite?

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)1.032x10

^{22 }b)1.032 x 10

^{23}c)3.88 x 10

^{22}d)1.302 x 10

^{22}and pls explain

What is the difference between O2 and 2O?

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

what is the atomicity of phosphorous?and valency?

explain dalton's atomic theory and write its drawbacks

Is there any trick to learn Valency?

Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.

How to solve numericals based on the mole concept?

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

^{23}no 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.

DEFINE MOLE CONCEPT & ITS FORMULAS?

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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 * 10

^{21}atoms b) 6.023 * 10^{23}atoms c) 1.7 * 10^{20}atoms d) 2.8 * 10^{2}^{2}atomsWhat is the difference between 2N and N

_{2}?_{3}_{ srisaji@yahoo.com}what are alkalis give 2 examples

what is the differences between 2H and H

_{2}?Calculate the mass of one atom of sodium.