A student is given two clear solutions. One solution contained lead ions, Pb2+ and the other solution contains chloride ions, Cl
2 answers:
Answer: A chemical change has occurred.
Explanation: A chemical change is a change which results when there is a change in the chemical composition of the atoms.
Chemical changes are accompanied by:
a) Change in color
b) Absorption or release of heat
c) formation of precipitates
d) production of gas
The white powder is precipitates of lead chloride which do not dissolve.
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According to Avogadro's number there are 62.53 atoms of chlorine in 1.1x 10 moles of Cl atoms.
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number or number of moles×Avogadro's number.
ON substitution in above formula number of atoms=1.1×10²¹×6.023×10²³=62.53 atoms
Thus, there are 62.53 chlorine atoms in 1.1x 10 moles of Cl atoms.
Learn more about Avogadro's number,here:
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