Very small semiconductor crystals, composed of approximately1000 to 10,000 atoms, are called quantum dots.Quantum dots made of the semiconductor CdSe are now beingused in electronic reader and tablet displays because theyemit light efficiently and in multiple colors, depending ondot size. The density of CdSe is 5.82 g/cm3.(a) What is the mass of one 2.5-nm CdSe quantum dot?(b) CdSe quantum dots that are 2.5 nm in diameter emitblue light upon stimulation. Assuming that the dot is aperfect sphere and that the empty space in the dot canbe neglected, calculate how many Cd atoms are in onequantum dot of this size.(c) What is the mass of one 6.5-nm CdSe quantum dot?(d) CdSe quantum dots that are 6.5 nm in diameter emitred light upon stimulation. Assuming that the dot is aperfect sphere, calculate how many Cd atoms are in onequantum dot of this size.(e) If you wanted to make one 6.5-nm dot from multiple 2.5-nm dots, how many 2.5-nm dots would you need, andhow many CdSe formula units would be left over, if any?
Very small semiconductor crystals, composed of approximately
1000 to 10,000 atoms, are called quantum dots.
Quantum dots made of the semiconductor CdSe are now being
used in electronic reader and tablet displays because they
emit light efficiently and in multiple colors, depending on
dot size. The density of CdSe is 5.82 g/cm3.
(a) What is the mass of one 2.5-nm CdSe quantum dot?
(b) CdSe quantum dots that are 2.5 nm in diameter emit
blue light upon stimulation. Assuming that the dot is a
perfect sphere and that the empty space in the dot can
be neglected, calculate how many Cd atoms are in one
quantum dot of this size.
(c) What is the mass of one 6.5-nm CdSe quantum dot?
(d) CdSe quantum dots that are 6.5 nm in diameter emit
red light upon stimulation. Assuming that the dot is a
perfect sphere, calculate how many Cd atoms are in one
quantum dot of this size.
(e) If you wanted to make one 6.5-nm dot from multiple 2.5-
nm dots, how many 2.5-nm dots would you need, and
how many CdSe formula units would be left over, if any?
Trending now
This is a popular solution!
Step by step
Solved in 5 steps
