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Atoms And Molecules
You must have seen two types of balances. A grocer has a balance with two platforms, or pans, and a needle moving on a scale. Some junk dealers (kabadi walas) may be using a spring balance to weigh used newspapers. Suppose the two balances give the same measure for a given body on the earth. Now, you take the balances to moon. Would the two balances give the same measure ? Explain your answer.
No, the two balance would measure different on the moon.
The pan balance measures inertial mass while the spring balance measures gravitational mass or weight of the body. Both masses are equivalent when measured on the earth. But, on the moon the value of 'g' becomes one-sixth of that on the earth. So, spring balance will measure one-sixth of the reading on the pan balance.
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Calculate the number of molecules of sulphur (S8) present in 16 gm of solid sulphur.
Calculate the number of aluminium ions present in 0.56 gm of aluminium oxide.
Explain law of conservation of mass.
50 g of 10% lead nitrate is mixed with 50 g of 10% sodium chloride in a closed vessel. After the reaction has taken place, it was found that 6.83 g of lead chloride was precipitated. Besides, the reaction mixture contained 90 g water and sodium nitrate. Calculate the amount of sodium nitrate formed.
Name and explain two important laws of chemical combination ?
What are the postulates of Dalton’s atomic theory of matter?
Hydrogen and oxygen combine in two different ways to produce water and hydrogen peroxide. Which of Dalton’s law does this observation confirm? Explain.
State drawbacks of Dalton’s atomic theory of matter.
Give an illustration based on atomic theory for the difference between an element, compound and mixture.
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