Question
The acceleration due to gravity at the moon's surface is 1.67 m/s2. If the radius of the moon is 1.74 x 106 m, calculate the mass of the moon. Use the known value of G.
Solution
The acceleration due to gravity at the moon's surface is 1.67 m/s2. If the radius of the moon is 1.74 x 106 m, calculate the mass of the moon. Use the known value of G.
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?
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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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