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Harini
Subject: Chemistry
, asked on 16/5/18
can element be made of many heteroatomic molecules ??
Answer
1
Harini
Subject: Chemistry
, asked on 16/5/18
the freezing point of water is o degree celsius , the melting point of ice is 0 degree celsius then what is the difference between the two ???
Answer
3
Harini
Subject: Chemistry
, asked on 16/5/18
H
2
+O
2
GIVES H
2
O , THIS IS A CHEMICAL REACTION SINCE A NEW PRODUCT IS FORMED , WHEN WE PASS ELECTRICITY IN H
2
O THEN WE WILL GET BACK H
2
AND O
2
, SO CAN WE CONSIDER SOME CHEMICAL REACTION TO BE REVERSIBILE ????
Answer
2
Vansh Gupta
Subject: Chemistry
, asked on 16/5/18
Solve this :
11.
What is the molarity of a solution of sodium chloride (At. wts. Na = 23, Cl = 35.5) which contains 60 g of sodium chloride in 2000 cm
3
of a solution ?
12.
Calculate the mole fraction of ethyl alcohol and water in a solution in which 46 g of ethyl alchol and 180 g of warter are mixed together.
Answer
1
Prakhar
Subject: Chemistry
, asked on 15/5/18
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?
Answer
1
Prakhar
Subject: Chemistry
, asked on 15/5/18
Q. Does dividing the % presence of an element in a compound by its molar mass give me the no. of moles? Is this what has been done here?
Answer
1
Harini
Subject: Chemistry
, asked on 15/5/18
how can u say that light and gamma rays are not matter ??
Answer
4
Harini
Subject: Chemistry
, asked on 15/5/18
in air filled baloon , we can say that there is a specific volume of air , then can we say that air has volume ??also the difference between the mass of a baloon and the mass of a air filled ballon indicates that air has some mass right ????
Answer
1
Prakhar
Subject: Chemistry
, asked on 15/5/18
The present system of measuring masses of elements (unified mass) is by comparing them to 1/12th of the mass of a carbon-12 isotope. But, the mass of carbon 12 isotope is itself taken 12u. If I want to find the mass in u of hydrogen and oxygen, how will I do it?
Answer
1
Prakhar
Subject: Chemistry
, asked on 15/5/18
​sol?
Q. If
Z
n
2
+
has an atomic number of 34 and a mass number of 65, the correct number of protons, neutrons, and electrons are i, ii and iii,
Answer
1
Jeosph
Subject: Chemistry
, asked on 15/5/18
13 th
Q 13.
A solution of glucose in water is labelled as 10 % (w/w). The density of the solution is 1.20 g/ml. Calculate (a) Molarity (b) Molality ?
Answer
2
Jeosph
Subject: Chemistry
, asked on 15/5/18
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Answer
2
Harini
Subject: Chemistry
, asked on 15/5/18
when does alpha deflect by large angles . when struck by proton or by nucleus ???
Answer
2
Harini
Subject: Chemistry
, asked on 15/5/18
how come alpha particle pass through the gold atom when struck at electron , it should struck to it right ???
Answer
1
Harini
Subject: Chemistry
, asked on 15/5/18
when we heat the sugar solution to create more space some sugar dissolves in it , so now it becomes super saturated , now when we cool the solution does the extra sugar settle at the bottom of the container or does it remain with the solution ??? explain the reason behind this
Answer
1
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What are you looking for?
11. What is the molarity of a solution of sodium chloride (At. wts. Na = 23, Cl = 35.5) which contains 60 g of sodium chloride in 2000 cm3 of a solution ?
12. Calculate the mole fraction of ethyl alcohol and water in a solution in which 46 g of ethyl alchol and 180 g of warter are mixed together.
Q. If has an atomic number of 34 and a mass number of 65, the correct number of protons, neutrons, and electrons are i, ii and iii,
Q 13. A solution of glucose in water is labelled as 10 % (w/w). The density of the solution is 1.20 g/ml. Calculate (a) Molarity (b) Molality ?