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Alborosie
3 years ago
6

Which chemical class does phenobarbital belong to?

Chemistry
1 answer:
drek231 [11]3 years ago
3 0
<span>Phenobarbital is derivative of Barbituric Acid and Barbituric Acid is derivative of Urea. (structures shown in Fig below)

Urea has H</span>₂N- group attached to Carbonyl Group (C=O), and such class of comounds conataining H₂N-C=O bond are called as Amides.

Result:
          So, <span>Phenobarbital belongs to Amides.</span>

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How many doubtful digit(s) is/are allowed in any measured quantity?
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Answer:

zero

Explanation:

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Matter is composed of basic substances called what
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The basic substances are called elements
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A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740 torr, and a temperature of 25 °C. Wh
iren2701 [21]

Answer:  Thus the new volume of the gas is 530  ml

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas =  740 torr

P_2 = final pressure of gas = 760 torr

V_1 = initial volume of gas = 500 ml

V_2 = final volume of gas = ?

T_1 = initial temperature of gas = 25^oC=273+25=298K

T_2 = final temperature of gas = 50^oC=273+50=323K

Now put all the given values in the above equation, we get:

\frac{740\times 500}{298}=\frac{760\times V_2}{323}

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6 0
3 years ago
If you compare the egg to a cell, what did you learn about how water moves into or out of a cell? What about salt water? Why doe
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If we compare a cell with an egg there is a major difference between the outer membrane

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The semi permeable membrane is a selectively permeable membrane which allows the movement of only solvent molecule and not solute molecules through it.

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8 0
3 years ago
Give the electron configuration for F.
postnew [5]

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Explanation:

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Properties of fluorine:

1. it is yellow in color.

2. it is flammable gas.

3. it is highly corrosive.

4. fluorine has pungent smell.

5. its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.  

6. Its atomic number of 9.

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Electronic configuration:

₉F = 1s² 2s² 2p⁵

4 0
3 years ago
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