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sineoko [7]
3 years ago
6

What ismetal refinning​

Chemistry
1 answer:
nikklg [1K]3 years ago
7 0

Answer:

It is the way of cleaning of impurities present in metals

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riadik2000 [5.3K]
I believe it is C) to produce
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As the mass of a star increases the lifespan of the star
ira [324]

Answer:

decreases

Explanation:

4 0
3 years ago
A redox reaction employed in an electrochemical cell has a negative . Which statement is true? a) E∘cell is positive b) K&gt;1 E
krok68 [10]

Answer:

d. K<1 E∘cell is negative

Explanation:

Since E⁰ = negative , ΔG = -nFE⁰ = -nF -ve = +ve.

Also, ΔG = -RTlnK

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Since ΔG = +ve, -RTΔG = -ve

K = 1/exp(RTΔG) < 1.

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3 years ago
Two steps in a synthesis of the analgesic ibuprofen include a carbonyl condensation reaction, followed by an alkylation reaction
Tresset [83]
Ibuprofen is synthesized by reacting ethyl 2-(4-isobutylphenyl)acetate with base, the base abstracts the acidic proton and enolate is formed which on reaction with diethyl carbonate generates diethyl 2-(4-isobutylphenyl)malonate (A). diethyl 2-(4-isobutylphenyl)malonate on treatment with Base again looses the acidic proton and forms enolate. The enolate with treatment with Methyl Iodide yields diethyl 2-(4-isobutylphenyl)-2-methylmalonate (B). diethyl 2-(4-isobutylphenyl)-2-methylmalonate on hydrolysis give Ibuprofen.

4 0
3 years ago
Read 2 more answers
Are the activities exothermic or endothermic?​
Alexandra [31]

Answer:

The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.

And last no reaction shows that heat is required so last reaction is endothermic reaction.

Explanation:

And heat is evolved in exothermic reaction and heat is absorbed in endo thermic reaction

6 0
3 years ago
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