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Gnom [1K]
3 years ago
11

Which best describes an element? A pure substance. A type of a mixture. A pure compound. An impure substance.

Chemistry
2 answers:
mr Goodwill [35]3 years ago
7 0

a pure compound because an element is untouched and is just itself

Volgvan3 years ago
4 0

Answer:

A) a pure substance

Explanation:

just took test on edg

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The aldol condensation involves nucleophilic attack of an enolate to a carbonyl. Use the pop-up menus to identify the total numb
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Aldol condensation involves the reaction of an acid or base with a carbonyl group producing a nucleophile that attacks another carbonyl compound  to yield a β-hydroxyaldehyde or β-hydroxyketone compound.

<h3>What is aldol condensation?</h3>

The aldol condensation is a reaction in organic chemistry in which there is a reaction between an acid or base and a carbonyl group which then serves as the nucleophile that attcks a second carbonyl to yield a β-hydroxyaldehyde or β-hydroxyketone compound.

The aldol condensation may be acid catalysed or base catlysed. The question is incomplete hence the complete mechanimsms can not be decuced.

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I can't fully answer this question because it is incomplete. In order for me to help you, I could just define what a precipitation reaction is and give a concrete example.

A precipitation reaction consists of two aqueous solutions that when reacted together, forms an insoluble salt. For example, 

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In this case, the precipitate is AgCl, Silver Chloride, which appears as a white solid.
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