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natulia [17]
3 years ago
12

Macy always thought there were only a few hair colors:blond,brown,and black. However,when she actually began looking around, she

saw varying shades of these hair colors. What is a possible reason for so many different hair colors
Chemistry
2 answers:
____ [38]3 years ago
7 0

Answer: The pigmentation of hairs is composed by different levels of eumelanin and pheomelanin. These pigments combined compose all the colours of hair. The more quantity of eumelanin the darker the hair is. Also, the level of the composition can vary over time, causing changes on the colour of the hair.  

Dafna1 [17]3 years ago
6 0

Answer: Pigment.

Explanation: Our hair color is determined by two types of pigment, Eumelanins, and Pheomelanins. Which together produces all the natural hair colors we see every day with other people.

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The predominant greenhouse gas produced by human use of fossil fuels is __________. View Available Hint(s) The predominant green
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Answer:

carbon dioxide

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Carbon dioxide -

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Identify the ways that art and science are similar
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Arts and science are similar in that they are expressions of what it is to be human in this world.

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3 0
3 years ago
Read 2 more answers
At 20°C the vapor pressure of benzene (C6H6) is 75 torr, and that of toluene (C7H8) is 22 torr. Assume that benzene and toluene
valina [46]

Answer: The mole fraction of benzene will be 0.34 and mole fraction of toluene is 0.66

Explanation:

According to Raoult's law, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the vapor pressure of that component in the pure state.

p_1=x_1p_1^0 and p_2=x_2P_2^0

where, x = mole fraction in solution

p^0 = pressure in the pure state

According to Dalton's law, the total pressure is the sum of individual pressures.

p_{total}=p_1+p_2\\p_{total}=x_{benzene}p_{benzene}^0+x_{toluene}P_{toluene}^0

x_{benzene}=x,

x_{toluene}=1-x_{benzene}=1-x,

p_{benzene}^0=75torr

p_{toluene}^0=22torr

p_{total}=40torr

40=x\times 75+(1-x)\times 22

x=0.34

Thus (1-x0 = (1-0.34)=0.66

Thus the mole fraction of benzene will be 0.34 and that of toluene is 0.66

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The maximum number of electrons that the second shell can contain is 8 electrons.
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