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MArishka [77]
3 years ago
15

Which of the following is not a clue that a chemical reaction has taken place? *

Chemistry
1 answer:
DaniilM [7]3 years ago
7 0

Answer:

A pure solid is heated and turns into a pure liquid.

Explanation:

No colour change recorded, only change of state, hence this is a physical change - physical changes I.e. change of state and temperature are not chemical reactions.

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Differentiate between Fundamental unit and derived unit​
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Fundamental Units are the units which are independent of any other unit.

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Explanation:

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Explanation:
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Structural strength and stability
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A chemistry student weighs out 0.027 kg of an unknown solid compound X and adds it to 550. mL of distilled water at 30.° C. Afte
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Answer:

1. Yes

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Explanation:

Solubility of  solute refers to how readily a solute will dissolve in a solvent at a particular temperature. Its the amount of moles or grams required to saturate 1dm^{3} or 1 Litre of water.

From the problem, when the liquid was drained off and amount of X which didn't dissolve was measured, it weighed 0.008kg, this means out of 0.027kg, 0.027-0.008 actually dissolved

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The solubility thus is 34.55g/L

 

5 0
3 years ago
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