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svlad2 [7]
3 years ago
7

Which statement best describes a physical change?

Chemistry
2 answers:
Inga [223]3 years ago
8 0

Answer:  3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same

Explanation:

Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.

Nina [5.8K]3 years ago
3 0
The answer is 2 because the composition won’t change just the physical aspects
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Which of the following two combinations of reactants is more appropriate for the preparation of p-nitrophenyl phenyl ether? Fluo
VladimirAG [237]

Answer:

p-fluoronitrobenzene and sodium phenoxide is more appropriate

Explanation:

An ipso substitution is required to form p-nitrophenyl phenyl ether.

For this ipso substitution, an alkoxide anion needs to attack as a nucleophile at the carbon atom attached to fluorine atom and thereby substitute that F atom.

p-nitrophenoxide is an weak nucleophile as compared to phenoxide due to presence of electron withdrawing resonating effect of nitro group at para position.

p-fluoronitrobenzene is a good choice for nucleophilic attack by alkoxide anion as compared to fluorobenzene due to higher positive charge density at carbon atom directly attached to F atom. Higher positive charge density arises due to presence of electron withdrawing resonating effect og nitro group at para position.

So, p-fluoronitrobenzene and sodium phenoxide is more appropriate

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4 years ago
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7 0
3 years ago
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Vanyuwa [196]

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3 0
3 years ago
Which grouping shows a decrease in Intermolecular
Anna11 [10]

Answer:

C) solid, liquid, gas

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7 0
3 years ago
How would you prepare 100 ml of 0.4 M MgSO4 from a stock solution of 2 M MgSO4?
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OK, so to answer this question, you will simply use the molality equation which is as follows:
<span>M1V1 = M2V2 
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</span>plug in the givens in the above equation:
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V1 = 20 ml

Based on this: you should take 20 ml of the 2 M solution and make volume exactly 100 ml in a volumetric flask by diluting in water.

7 0
3 years ago
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