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jonny [76]
3 years ago
12

Giovanni created this chart to study for an exam. Which best describes how to correct the error in the chart? Remove “plastics”

from the uses for sodium hydroxide. Swap the uses for iron oxide and calcium carbonate. Change the use for calcium chloride to “used in preservatives.” Add “de-ice roads” to uses for calcium carbonate.
Chemistry
2 answers:
Nastasia [14]3 years ago
6 0

Answer:

the answer is swap the uses for iron oxide and calcium carbonate. on edg

Vanyuwa [196]3 years ago
5 0

Calcium carbonate when mixed with water result in the formation of Calcium hydroxide which is used as an antacid. The chloride ion also helps in the whitening of teeth thus finding its use as an ingredient in toothpaste.

Iron oxide is dark pigment which is naturally used in makeup.

<span>Therefore the answer to this question is Swap the uses for iron oxide and calcium carbonate. </span>

<span> </span>

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It takes to break an iodine-iodine single bond. Calculate the maximum wavelength of light for which an iodine-iodine single bond
Zolol [24]

The given question is incomplete. The complete question is :

It takes 151 kJ/mol to break an iodine-iodine single bond. Calculate the maximum wavelength of light for which an iodine-iodine single bond could be broken by absorbing a single photon. Be sure your answer has the correct number of significant digits.

Answer:  793 nm

Explanation:

The relation between energy and wavelength of light is given by Planck's equation, which is:

E=\frac{hc}{\lambda}

where,

E = energy of the light  = 151 kJ= 151000 J   (1kJ=1000J)

N= moles = 1 = 6.023\times 10^{23}

h = Planck's constant  = 6.626\times 10^{-34}Js

c = speed of light  = 3\times 10^8m/s

\lambda = wavelength of light  = ?

Putting in the values:

151000J=\frac{6.023\times 10^{23}\times 6.626\times 10^{-34}Js\times 3\times 10^8m/s}{\lambda}

{\lambda}=7.93\times 10^{-7}m=793nm    1m=10^{-9}nm

Thus  the maximum wavelength of light for which an iodine-iodine single bond could be broken by absorbing a single photon is 793 nm

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