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scoundrel [369]
3 years ago
10

Who invented carbon element?

Chemistry
1 answer:
igor_vitrenko [27]3 years ago
8 0
Carbon discovered in Prehistoric times.. Discoverer will probably never be known
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A photon of green light strikes an unknown metal and an electron is emitted. The voltage is set to 2 volts. The electron cannot
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Answer:

The correct answer is:

An electron will be emitted in the second experiment, but it cannot be determined whether it will reach the second plate.

Explanation:

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e = hf

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6 0
2 years ago
How many milliliters of a 0.40%(w/v) solution of nalorphine must be injected to obtain a dose of 1.5 mg?
ozzi
The number  of Ml  of  a  0.40 %w/v solution  of   ,nalorphine  that must  be injected  to  obtain  a  dose  of 1.5 mg is  calculated as  below


since M/v%   is  mass  of solute  in  grams per 100  ml

convert Mg to  g
1 g = 1000 mg  what  about  1.5 mg =?  grams
=   1.5 /1000 = 0.0015 grams


volume is therefore =  100 (  mass/ M/v%)

= 100  x(  0.0015/ 0.4) =  0.375  ML
6 0
3 years ago
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