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spayn [35]
1 year ago
14

What is the half life of sodium-24 if after 12 days the sample has a mass of 1.2 g from an initial mass of 9.6 g?

Chemistry
1 answer:
Anika [276]1 year ago
6 0
As well as I think the answer is 24 days
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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.

5 0
3 years ago
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pashok25 [27]

Answer:

Nervous system messages travel through neurons as electrical signals. When these signals reach the end of a neuron, they stimulate the release of chemicals called neurotransmitters. Neurotransmitters travel across synapses, spaces between neurons or between neurons and other body tissues and cells.

Explanation:

3 0
3 years ago
Which shows the formula for an Organic acid
tresset_1 [31]
Answer:
            The formula of Organic acid is as follow,

                                                 R-COOH

Explanation:
                   The class of organic acids is called Carboxylic Acids. In above general structure, R is alkyl group and can vary. While -COOH is the functional group. 
                    Carboxylic Acids has the tendency to loose protons and their pKa value depends upon the alkyl group. For example the pKa value of Acetic acid (R = -CH₃) is 4.7. The driving force for this acidity is the stability of carboxylate (conjugate base) due resonance. i.e

                               RCOOH     ⇄    RCOO⁻  +  H⁺
Where;
            RCOO⁻  =  Carboxylate Ion (Conjugate base)
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3 years ago
WILL MARK AS BRAINLIEST IF CORRECT
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3 0
3 years ago
- prediction
kolezko [41]

Answer:

theory

Explanation:

Fits all criteria

- Hope that helps! Please let me know if you need further explanation.

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