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marshall27 [118]
3 years ago
7

What is meant by the negative sign in an answer like"-46.8kJ"? When would you use a positive sign

Chemistry
1 answer:
MA_775_DIABLO [31]3 years ago
3 0
It’s positive when you use energy for work
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In most cases of fischer esterification, the carboxylic acid is the more "valuable" piece and the alcohol is used in excess. let
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There are a lot of separation processes. To name a few, these can be distillation, centrifugation, extraction, membrane or sorption process and many other. To know which is the best technique, you should know the property between two substances that have a stark difference. In this case, it is the polarity. Ethyl alcohol is more polar than ethyl ester and less dense. Thus, these two won't mix. So, take advantage of their density difference by decantation or centrifugation.
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3 years ago
What is the freezing point in °C) of a 0.743 m
lesantik [10]

Answer:

-0.276 Degrees C

Explanation:

kf of water is 1.86

Freezing point depression= m x kf x i

i= ions present ( K+ Cl-) 1=2

1.86x2X.743= .276

Since its freezinf point depression the freezing point will lower

so

0-.276= -.276

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I need help on chemistry work
Flauer [41]

Answer:

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Explanation:

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(a)0.444 Mol of COCl2 in 0.654 L of solution
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