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Jlenok [28]
3 years ago
8

I 13 Suggest why this group is called Group 8.​

Chemistry
1 answer:
yarga [219]3 years ago
3 0

Answer:

because it's in group 8

Explanation:

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water is considered as a compound of hydrogen and oxygen and not a mixture of hydrogen and oxygen and comment on it
HACTEHA [7]
Wat is considered a compound of hydrogen and oxygen and not a mixture because hydrogen and oxygen have gone through a chemical process to form the compound h2O. A mixture can generally be easily separated whereas a compound must undergo another chemical process to separate its elements. Therefore to separate oxygen and hydrogen from water a chemical process is necessary. 
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3 years ago
What is the wavelength of one ultraviolet photon if it’s frequency is 1.50 x 10^15 s^-1
Alik [6]
C=λν ==> λ=c/ν

λ= 3x10^8 m/s / 1.50 x 10^15 s^-1
λ= 2 x 10^-7 m
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5 0
3 years ago
Copper has two naturally occurring isotopes, 63Cu (isotopic mass 62.9296 amu) and 65Cu (isotopic mass 64.9278 amu). If copper ha
Semenov [28]

Answer:

Percentage of first isotope = 69.152 %

Percentage of second isotope =  30.848 %

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

For first isotope:

Let % = x %

Mass = 62.9296 amu

For second isotope:

% = 100 - x  %  (Since, there are only two isotopes)

Mass = 64.9278 amu

Average mass = 63.546 amu

Thus,  

63.546=\frac {x}{100}\times {62.9296}+\frac {(100-x)}{100}\times {64.9278}

Solving,

1.9982 x = 138.18

Thus,

<u>Percentage of first isotope = x = 69.152 %</u>

<u>Percentage of second isotope = 100 - x % = 30.848 %</u>

5 0
4 years ago
What makes nitric oxide unique among neurotransmitters?​ Select one: a. ​It is an organelle. b. ​It is released before the actio
kaheart [24]

Answer: It is a gas  

Explanation:

The most unique thing about nitric oxide being a neurotransmitter is that it is the only neurotransmitter which is in gaseous form.

Nitric oxide is small gaseous molecules which is synthesized by the de novo process in the neuronal tissue.

It can diffuse by plasma membrane.

It diffuses out of the postsynaptic neurons and acts on the neighboring neurons and presynaptic terminals to assist the generation of the Long Term potentiation.

5 0
3 years ago
CH4 is the ___________________ formula for methane.
Llana [10]
CH4 is the molecular formula for methane.
5 0
3 years ago
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