Answer the following:
1. What is the compound Al2(SO4), and give the ions present in it.
2. What is ‘atomic mass unit’? How is it linked with relative atomic mass?
3. What is Avogadro’s number? Why is it also known as Avogadro’s constant ?
4. Which are the six postulates of Dalton’s atomic theory?
Answers
Answer:
1. In the chemical formula Al2(SO4)3, the Al2 means there two aluminium (atoms or ions). The SO4 is a sulfate ion and (SO4)3 means there are 3 sulfate ions. The number 3 before Al2(SO4)3 means there are three times the number of atoms and ions of the chemical formula.
2. Relative atomic mass is determined by the average atomic mass, or the weighted mean of the atomic masses of all the atoms of a particular chemical element found in a particular sample, which is then compared to the atomic mass of carbon-12.
3. (a) Avogadro's number is the number of particles (atoms, ions, molecules etc) present in one mole of any substance. The number is also called Avogadro's constant because its value is fixed (6.022×1023) irrespective of the nature of the particles.
4. Postulates
All matter consists of indivisible particles called atoms.
Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.
Atoms cannot be created or destroyed.
Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.
Atoms of same element can combine in more than one ratio to form two or more compounds.
The atom is the smallest unit of matter that can take part in a chemical reaction.
Explanation:
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