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Atomic Mass And Molecular Mass Free Doubts and Solutions

CBSE - IX - Chemistry - Atoms and Molecules

what are atomic mass

Asked by shailendrakumar 7th June 2018, 10:56 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is the mass of one mole of nitrogen atoms

Asked by hemrajkharyalsurya 22nd April 2018, 1:30 PM
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CBSE - IX - Chemistry - Atoms and Molecules

write the formula unit mass of  [a] CUSO4 [b] 5H2O

Asked by Garima 10th February 2018, 6:27 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is valency??  

Asked by aryaaaruuz 23rd January 2018, 8:14 AM
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CBSE - IX - Chemistry - Atoms and Molecules

calculate the molar mass of cao  

Asked by nareshshahdynamic 3rd January 2018, 1:38 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Q NO 1 WHAT HAPPEN WHEN SOLUTION OF SODIUM CHLORIDE AND SILVER NITRATE MIXED TOGETHER 
Q NO 2 WHAT HAPPEN WHEN SOLUTION OF SODIUM SULPHATE AND BARIUM REACT TOGETHER .
Q NO 3 TWO ELEMENT X AND Y COMBINE TO FORM COMPOUND XY IN RATIO 1:35.5 MASS. WHAT MASS OF Y WILL COMBINE 2 GRAMS OF X
QNO 4 IF 100 G OF WATER IS DECOMPOSED , HOW MANY G OF OXYGEN AND HYDROGEN ARE OBTAINED .
Q NO 5 THE ATOMIC NO. OF THREE ELEMENTS A, B,C ARE 9,10,13 RESPECTIVELY ,WHICH OF THEM WILL FORM A CATION.
Q NO 6. WHAT IS AVOGARDO'S CONSTANT.
Q NO 7 WRITE FORMULA OF QUICK LIME,ALUMINIUM OXIDE,SODIUM CARBONATE,BAKING SODA.
Q NO 8 WRITE CATIONS AND ANION IN THE FOLLOWING COMPOUNDS , CH3COONA,NACL,HNO3,MGCL2,CA3(PO4)2,H2SO4,ALCL3
Q NO 9 FIND THE MOLECULAR MASS OF H2S,CL2,CH3COOH,CH3CHO.
Q NO 10 . CALCULATE MASS OF ONE MOLE OF CO2,C2H6,CH3OH,OXYGEN GAS,CHLORINE GAS,NH3 AND NITROGEN GAS, 1.5 MOLES OF WATER , 3 MOLES OF NEON , 0.5 MOLES OF SODIUM , 2 MOLES OF NITROGEN ELEMENT.
Q NO 11 . HOW MANY MOLES ARE PRESENT IN THE FOLLOWING 
a 4.6 gm of Na
b 200 gm of S
C Hf
d Sdjfs
e Dfjkj
Q NO 12 WRITE DIFFERENCE BETWEEN 
A 2 N AND N2
B ATOM AND MOLECULES
C ANION AND CATION
D IONIC AND MOLECULE COMPOUND 
Q NO 13 CONVERT IN TO MOLES 
A 12 GM OF OXYGEN 
B 20 G OF WATER 
C 22 G OF CARBONDI OXIDE
D 4.9 G OF SULPHURIC ACID 
E 56 G OF QUICK LIME
F 1.06 OF BAKINF SODA
Q NO 14 Show 5 moles of carbondioxide and 5 moles of water do not have same mass.
Q NO 15 Show 240 g pf calcium and 240 g of magnesium elements have a mole ratio of 3:5
Q NO 16 Compute the number of ions present in 5.85 g of sodium chloride .
Q NO 17 How many grams of magnesium will have the same number of atoms as 6 g of carbon.
Q NO 18 A gold sample contains 90% of gold and rest copper . How many atoms of gold are present in one g of this sample .
QNO 19 Calculate the mass percentage of each element in one mole of Al2(co3)3
QNO 20 You are provided with few white coloured powder which is either sugar or common salt . How will you identify without tasting it.    
 

Asked by ajaykataria222 31st December 2017, 6:13 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is  atom 

Asked by Sthau 8th December 2017, 8:24 AM
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CBSE - IX - Chemistry - Atoms and Molecules

How can we calculate the valency of elements ??

Asked by Jitendra 3rd November 2017, 6:27 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Explain the following terms:-
Atom,Molecule,Compound,Element

Asked by md775016 26th July 2017, 3:57 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Molecular formula mass and molecular concept definition and numerical
 

Asked by Esha Gupta 21st March 2017, 3:14 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Question 1.
 
 

Asked by gpnkumar0 13th March 2017, 4:55 PM
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CBSE - IX - Chemistry - Atoms and Molecules

C2H5OH + NA ->

Asked by Koshalendra Singh 11th March 2017, 8:34 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is atom mass

Asked by anshuldabral78 12th September 2016, 9:41 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is difference between Mass and weight .
 
Kindly explain with real life examples 

Asked by Swati .Anand 11th July 2016, 5:49 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the names of the compounds represented by the following formulae : (i)NaBr (ii)Al2O3 (iii)ZnNO3 (iv)CaCO3

Asked by Topperlearning User 2nd June 2016, 3:30 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Define atomic mass unit

Asked by Topperlearning User 30th March 2016, 10:37 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What are the rules for writing the chemical formulae?

Asked by Topperlearning User 30th March 2016, 10:35 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Using the valency of ions, write the formulae of the following compounds. Formula of Carbon dioxide Formula of Sodium phosphate Formula of Magnesium sulphate Formula of Ammonium bicarbonate Formula of Ammonium sulphate

Asked by Topperlearning User 30th March 2016, 10:32 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the significance of molecular formula?

Asked by Topperlearning User 30th March 2016, 10:24 AM
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CBSE - IX - Chemistry - Atoms and Molecules

How to determine molecular mass?

Asked by Topperlearning User 30th March 2016, 10:21 AM
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CBSE - IX - Chemistry - Atoms and Molecules

How to determine formula unit mass?

Asked by Topperlearning User 30th March 2016, 10:15 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Differentiate between atom and molecule (two points).

Asked by Topperlearning User 30th March 2016, 10:13 AM
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CBSE - IX - Chemistry - Atoms and Molecules

An element 'X'forms an oxide with formula X2O3 (i)State the valency of X (ii) Write the formula of      (a) chloride of X      (b) Sulphate of X.

Asked by Topperlearning User 30th March 2016, 10:09 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Element A has valency one and element B has valency 2. Diagrammatically show how the compound formed by element A and B respectively and give the formula of the compound.

Asked by Topperlearning User 30th March 2016, 10:07 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the difference between 2O and O2?

Asked by Topperlearning User 30th March 2016, 10:05 AM
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CBSE - IX - Chemistry - Atoms and Molecules

The ratio by mass of Nitrogen with Hydrogen in ammonia is 14:3. Calculate the ratio by number of atoms of elements in an ammonia molecule.

Asked by Topperlearning User 30th March 2016, 10:04 AM
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CBSE - IX - Chemistry - Atoms and Molecules

(i) Name the body which approves the nomenclature of elements and compounds. (ii) The symbol of sodium is written as Na and not as S. Give reasons.

Asked by Topperlearning User 30th March 2016, 9:59 AM
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CBSE - IX - Chemistry - Atoms and Molecules

You are given an element 168X. Write the chemical formula of the compound formed when 'X' reacts with: (i)hydrogen,(ii)carbon

Asked by Topperlearning User 30th March 2016, 9:53 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Calculate the actual mass of the atomic mass unit.

Asked by Topperlearning User 30th March 2016, 9:47 AM
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CBSE - IX - Chemistry - Atoms and Molecules

(a) Explain the difference between an atom and an ion. Write the electronic configuration of atom and positive ion of 2311X. (b) Write the compound formed when ion of element 'X' combines with carbonate ion.

Asked by Topperlearning User 30th March 2016, 9:34 AM
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CBSE - IX - Chemistry - Atoms and Molecules

THE ABSOLUTE MASS OF ONE MOLECULE OF A SUBSTANCE IS 5.32 * 10^-23g (5.32 * 10 TO THE POWER MINUS 23). WHAT IS ITS MOLECULAR MASS ? WHAT COULD THIS SUBSTANCE BE ?

Asked by Adarsh 22nd March 2016, 2:46 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what do you mean by atomicity
 
 
thank you in advance

Asked by prathisami 13th March 2016, 9:07 PM
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CBSE - IX - Chemistry - Atoms and Molecules

how to write formulae of simple compounds?
and how to write the valency while writing the symbols of some common,simple and polyatomic ions?

Asked by Nandhini Jagadeesan 7th February 2016, 11:14 AM
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CBSE - IX - Chemistry - Atoms and Molecules

the mass of 1 atom of an element is =2*10 power-23 
a) calculate the atomic mass of the element
b) what could this element be 

Asked by pahiroy1221 8th January 2016, 12:57 PM
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CBSE - IX - Chemistry - Atoms and Molecules

mass of 1 atom and atomic mass are different things or the same things 

Asked by pahiroy1221 8th January 2016, 12:50 PM
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CBSE - IX - Chemistry - Atoms and Molecules

WHAT IS THE EASIEST WAY TO FIND THE CHEMICAL FORMULA OF TWO SUBSTANCES?

Asked by yugasumathi1975 20th December 2015, 10:47 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Please help me. I am confused with these terms. What are Atomic mass, Atomic weight, Mass number, Molar mass and atomic mass unit? Please explain briefly about them.How are they different from others? Please tell me the definition of these terms with examples. How are they calculated?

Asked by Divyaa 29th November 2015, 12:32 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is difference between atomic mass and molecular mass

Asked by bansi 16th November 2015, 12:19 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is molar mass 
 

Asked by Dhruvmakholia 31st October 2015, 11:34 AM
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CBSE - IX - Chemistry - Atoms and Molecules

How do we calculate the molecular mass and formula unit mass.Please explain as fast as possible.

Asked by sabu_sreeja 29th October 2015, 9:01 PM
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CBSE - IX - Chemistry - Atoms and Molecules

How do we calculate molecular mass and formula unit mass.

Asked by sabu_sreeja 28th October 2015, 4:20 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is law of conservation of mass explain briefly......
 

Asked by digantverma08 23rd October 2015, 8:44 PM
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CBSE - IX - Chemistry - Atoms and Molecules

I am not able to understand the concept of polyatomic ions and valency could you plz explain it in simple terms and how will we know what is the ion charge on an element.

Asked by Harshita Singh 21st October 2015, 4:26 PM
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CBSE - IX - Chemistry - Atoms and Molecules

why we only take relative mass for taking out other elements mass
 

Asked by shub3893 12th October 2015, 5:35 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is the use of carbon-12 atom?

Asked by 2002rishabhverma 11th October 2015, 3:08 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is atoms 

Asked by Dorilal 10th October 2015, 12:02 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Why does the water starts to get boil after creating vaccum i.e removing all the air? 

Asked by aman21nikwar 4th October 2015, 6:39 PM
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CBSE - IX - Chemistry - Atoms and Molecules

tech testing

Asked by Krishna Kumar Yadav 3rd September 2015, 11:37 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What is carbon-12 isotope?How did it come in use?
 

Asked by Harshita Singh 18th August 2015, 10:26 PM
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CBSE - IX - Chemistry - Atoms and Molecules

name a thing which goes up or anti-gravity when placed on ground.

Asked by kinggeorgeeducationsociety 27th May 2015, 3:26 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what happen when the mercury is heated on max heating point ?

Asked by Chanakya Sinha 15th March 2015, 9:08 AM
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CBSE - IX - Chemistry - Atoms and Molecules

5 g of clacium reacts with 2 g of oxygen to form a compound. Find the molecular formula of the compound.(Atomic mass of Ca= 40 u, O=16u

Asked by SINDHUJA SRIVASTAVA 9th March 2015, 1:12 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(a) What is relative atomic mass? Express it in the form of an equation. (b) What does the symbol 'Fe' indicates about the mass of iron element?

Asked by Topperlearning User 4th February 2015, 10:40 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Explain molecular mass and mole concept in details.

Asked by singhaivk05 27th January 2015, 6:51 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is polyatomic ions?

Asked by paddipawar 1st December 2014, 9:12 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the difference between atomic mass and molecular mass?
 

Asked by rajnisinha93 4th November 2014, 1:19 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what are electrons neutrons and protons

Asked by asmita shah 15th October 2014, 4:12 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is atomic mass ?? give examples ? 

Asked by sinha.nid25 7th October 2014, 6:05 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the chemical formulae of: (i)Calcium sulphate (ii)Magnesium oxide (iii)Potassium chloride (iv)Sodium hydroxide (v)Calcium oxide (vi)Hydrogen sulphide

Asked by Topperlearning User 20th May 2014, 3:11 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What are ionic compounds and molecular compounds? Give two examples of each of the following.

Asked by Topperlearning User 20th May 2014, 3:09 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(i) Give any two points of significance of the formula H2O.(ii) Find the molecular mass of water.

Asked by Topperlearning User 20th May 2014, 3:07 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Give symbols of the following elements. Copper, Sulphur, Sodium, Magnesium

Asked by Topperlearning User 20th May 2014, 3:06 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the chemical formulae of the following compounds? (i) Hydrogen Sulphide (ii) Zinc phosphate (i)Magnesium Hydroxide

Asked by Topperlearning User 20th May 2014, 3:04 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the valency of metal and non-metal in CaCl2?

Asked by Topperlearning User 20th May 2014, 3:03 PM
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CBSE - IX - Chemistry - Atoms and Molecules

WHT THE PUDDLE OF WATER EVAPORATE QUICKLY AT SUMMER TIME?

Asked by nandlal 14th May 2014, 6:02 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Identify the polyatomic ions in the following compounds. (a) MgCO3  (b) Na2SO4

Asked by Topperlearning User 9th May 2014, 3:25 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the chemical formulae of the following compounds:- (i)Ammonium sulphate (ii)Magnesium carbonate

Asked by Topperlearning User 9th May 2014, 3:23 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the chemical formula of the compound formed by K+ and (SO4)2- ions.

Asked by Topperlearning User 9th May 2014, 3:22 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write down the chemical formula of sodium oxide and Magnesium hydroxide.

Asked by Topperlearning User 9th May 2014, 3:22 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the difference between 2H and H2?

Asked by Topperlearning User 9th May 2014, 3:21 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(a)What are polyatomic ions? Give one example each of polyatomic cation and anion. (b) What do you understand from the statement "relative atomic mass of sulphur is 32"? (c) What is meant by the term 'chemical formula'?

Asked by Topperlearning User 9th May 2014, 3:20 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the names of elements present in the following compounds: (i)Slaked lime (ii)Hydrogen bromide

Asked by Topperlearning User 9th May 2014, 3:19 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is meant by the term chemical formula? Write the chemical formula of Calcium Oxide. Calculate its formula unit mass. (Atomic mass of Ca = 40 u, O = 16 u)

Asked by Topperlearning User 9th May 2014, 3:19 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the cations and anions present in ammonium chloride.

Asked by Topperlearning User 9th May 2014, 3:18 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write down the formulae of: (a) Sodium carbonate (b) Ammonium chloride (c) Zinc oxide (d) Aluminium hydroxide

Asked by Topperlearning User 9th May 2014, 3:16 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Name the anion and cation which constitute the molecule of magnesium oxide.

Asked by Topperlearning User 9th May 2014, 3:15 PM
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CBSE - IX - Chemistry - Atoms and Molecules

The chemical formula of oxide of an element 'X' is X2O5. Write the chemical formula of its chloride.

Asked by Topperlearning User 9th May 2014, 3:14 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What are the different types of anions? Give two examples of each.

Asked by Topperlearning User 9th May 2014, 3:13 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the chemical formula of ammonium sulphate.

Asked by Topperlearning User 9th May 2014, 3:06 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the chemical symbols of two elements: (a) Which are formed from the first letter of the element's name. (b) Whose name has been taken from the name of the element in Latin.

Asked by Topperlearning User 9th May 2014, 3:05 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(i)What do the following symbols formulae stand for : (a)2O (b) O2 (c)O3 (d)H2O (ii) Give the chemical formulae of the following compounds. (a) Potassium Carbonate(b) Calcium chloride (iii) Calculate the formula unit mass of Al2(SO4)3 (Given atomic mass of Al - 27u, S - 32u, O - 16u)

Asked by Topperlearning User 9th May 2014, 3:04 PM
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CBSE - IX - Chemistry - Atoms and Molecules

An element Y has a valency 3. Write the formula of its oxide.

Asked by Topperlearning User 9th May 2014, 3:02 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(i) What is the difference between sodium atom and sodium ion? Give any two points.(ii) What is Avogadro's constant?(iii) The element X has valency 3 while the element Y has valency 2. Write the formula of the compound between X and Y.

Asked by Topperlearning User 9th May 2014, 3:00 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is meant by the term chemical formula? Give an example.

Asked by Topperlearning User 9th May 2014, 2:56 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Name the triatomic oxygen molecule and give its molecular formula also.

Asked by Topperlearning User 9th May 2014, 2:55 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Explain the mechanism behind writing the formula of the following compounds: 1. Magnesium oxide 2. Hydrogen chloride 3. Carbon dioxide

Asked by Topperlearning User 9th May 2014, 2:49 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What do the following abbreviations stands for?(a) 2O(b) O2

Asked by Topperlearning User 9th May 2014, 2:48 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Give two examples of polyatomic ions?

Asked by Topperlearning User 9th May 2014, 2:14 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(a) Define a cation? How is a cation formed? (b) A cation has a positive charge on it. Explain with the help of an example.

Asked by Topperlearning User 9th May 2014, 2:14 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What are polyatomic ions?

Asked by Topperlearning User 9th May 2014, 2:13 PM
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CBSE - IX - Chemistry - Atoms and Molecules

An element 'Z' forms the following compound when it reacts with hydrogen, chlorine, oxygen and phosphorus. ZH3, ZCl3, Z2O3 and ZP (a)What is the valency of element Z? (b)Is element 'Z' metal or non-metal?

Asked by Topperlearning User 9th May 2014, 2:13 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(i) Define the term 'atomic mass unit'. How is it linked with relative atomic mass? (ii) How do we know the presence of atoms if they do not exist independently for most of the elements?

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CBSE - IX - Chemistry - Atoms and Molecules

Define the following terms with example. (a) Atomicity (b) Anion (c) Molecular Mass (d) Relative Formula Mass (e) Cation

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CBSE - IX - Chemistry - Atoms and Molecules

Define simple ions. Give two examples.

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CBSE - IX - Chemistry - Atoms and Molecules

What atomic mass has been assigned to Carbon-12? How are the atomic masses of all other elements determined?

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CBSE - IX - Chemistry - Atoms and Molecules

Write the Latin name and symbol of (i) Gold (ii) Lead.

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CBSE - IX - Chemistry - Atoms and Molecules

Define an ion. In case of sodium chloride, name the cation and anion and give symbols for each of them.

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CBSE - IX - Chemistry - Atoms and Molecules

Which element is taken as standard for determining atomic mass of various elements and how it is determined?

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