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Triss [41]
3 years ago
14

The student who answers the riddle will get the prize ? underline pronoun.​

Chemistry
2 answers:
mariarad [96]3 years ago
6 0

answer:

the student <u>who</u> answers the riddle will get the prize

explanation:

  • who is the pronoun
  • a pronoun is something that substitutes for a noun
Sedaia [141]3 years ago
3 0
Answer: who

Explanation: it takes place of the noun

Hope this helps! :)
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Does pyridine undergo nucleophilic aromatic substitution reactions? If no, why not. If yes, on what position does the substituti
sergij07 [2.7K]

Explanation:

Part a

Pyridine is an aromatic heterocyclic compound and undergoes nucleophilic aromatic substitution reaction at 2 and 4 positions.

This is because, when a  nucleophile attack pyridine at 2 and 4 positions, the anoin formed is stabilized. In the anion formed is tabilized by resonance and also negative charge is present at electronegative atom, nitrogen.

If the nucleophile attack at 3 position, the anion formed is not as stable as anions formed when nucleophile attach at 2 and 4 positions. This is because negative charge is not present at the nitrogen atom.

Part b:

Tautomers are structural isomers of each others formed by migration atom within the molecule. Tautomers exist in equilibrium with each other.

Tautomers of 2-Hydroxypyridine and 4-Hydroxypyrine are given in the attachment.

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3 years ago
Consider the following reaction. Upper C upper O subscript 2 (g) plus upper H subscript 2 (g) right arrow Upper C upper O (g) pl
alex41 [277]

Answer:

Its (d) hydrogen

Explanation:

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3 years ago
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What is the pH of a solution of H2SO that has (H3O+) = 5.45 x 10^-5 M?
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3 years ago
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What is the voltage across a 100 ohm circuit element that draws a current of 1 A?
andrey2020 [161]

Answer:

8) 45 volt

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Explanation:

using ohms law all through

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3 years ago
3.) this graph shows the rates of reaction in a chemical reaction with and without the addition of an enzyme
mars1129 [50]

Answer:

a. Concave down

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b. The enzyme increases the proportion of effective combination of substrates to form the products

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