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ANEK [815]
2 years ago
14

Which of these statements best describes physical properties?

Chemistry
1 answer:
balu736 [363]2 years ago
5 0

The correct answer would be D: Physical properties can be observed without changing the identity of a substance

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C. Tip had the lower pressure, it was 652.71mmHg

Explanation:

To answer this question you need to convert both values into a common unit so you can compare directly.

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If the change of enthalpy of this reaction when proceeding left to right is +14 kcal, which chemical equation is correct?
bagirrra123 [75]

Answer:

N₂O₄ + 14 kcal ⇄ 2NO₂.

Explanation:

Since the sign of ΔH determines either the reaction is exothermic or endothermic:

+ve, the reaction is endothermic.

-ve, the reaction is exothermic.

∵ The change of enthalpy of this reaction when proceeding left to right is + 14 kcal (+ ve sign).

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So, the reaction is:

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7 0
3 years ago
Arrange the following compounds in decreasing order of acidity from left to right, and explain the reason in less than 90 words.
saveliy_v [14]

Explanation:

More is the electronegativity of atoms attached to the alpha carbon atom more will be the attraction of electron towards it. As a result, release of hydrogen ion will be easier.

Therefore, there will be increased in acidity of the compound.

Since, fluorine, chlorine and bromine are all group 17 elements and fluorine is more reactive than chlorine. On the other hand, chlorine is more reactive than bromine.

Hence, ability to attract the electrons towards itself will be maximum in fluorine and least in bromine.

Therefore, decreasing order of acidity of the given compounds is as follows.

        CF_{3}COOH >  CCl_{3}COOH > CBr_{3}COOH > CH_{3}COOH

8 0
3 years ago
Which equation shows a conservation of mass?
pychu [463]
(4) PCl5--> PCl3+ Cl2 is the correct answer because we both have 1 P atom and 5 Cl atoms on both sides, and thus the masses of the elements don't change.
Hope this would help~
8 0
3 years ago
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