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3 years ago

On a camping trip, Marta roasts a marshmallow in the campfire. The marshmallow grows, and then turns black.

Chemistry

2 answers:

Setler [38]3 years ago

6 0

Answer

Explanation:

Mandarinka [93]3 years ago

4 0

Answer:

The answer is D.

Explanation:

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Which chemical class does phenobarbital belong to?

drek231 [11]

<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>

3 0

3 years ago

Which question would be scientifically reasonable for a student to ask about the layers of the Earth?

lubasha [3.4K]

Answer:

The answer is C

Explanation:

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3 years ago

Which material is very strong and tough but shows very little elongation as it absorbs energy?

natita [175]

Kevlar would be the answer!! enjoy the rest of your day broskies!!!

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3 years ago

A sample of gaseous neon atoms at atmospheric pressure and 0 °c contains 2.69 * 1022 atoms per liter. the atomic radius of neon

omeli [17]

Explanation

Radius of neon atom : 69 pm = $69\times 10^{-12} m$

Volume occupied by the one atom: $\frac{4}{3}\pi r^3$

$=\frac{4}{3}\times 3.14\times(69\times 10^{-12} m)^3=1.37\times 10^{-30} m^3$

given that $2.69\times 10^{22}$ atoms are present in 1L

1 L = 0.001 $m^3$

The volume occupied by the $2.69\times 10^{22}$ neon atoms

$2.69\times 10^{22}\times 1.37\times 10^{-30} m^3=3.68\times 10^{-8} m^3$

Fraction of volume occupied by the neon atom:

$=\frac{3.68\times 10^{-8} m^3}{0.001 m^3}=3.68\times 10^{-11} m^3$

$3.68\times 10^{-11} m^3$

The fraction of of volume occupied by the neon atom is very less than the 1 L which indicates the presence of large amount of empty space between the atoms of the gas.

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3 years ago

Metals react by what electrons?

fomenos

Answer:

valence electrons

Explanation:

5 0

3 years ago