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ioda
3 years ago
6

1. Which chemical equation represents a double replacement reaction?

Chemistry
2 answers:
creativ13 [48]3 years ago
6 0
The answer would be AX+BY=AY+BX
astra-53 [7]3 years ago
5 0

Answer:

AX+BY=AY+BX

Explanation:

Double-replacement reactions are represented by the general equation AX+BY=AY+BX a reaction in which a substance combines with oxygen, releasing a large amount of energy in the form of light and head

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n the laboratory, a general chemistry student measured the pH of a 0.342 M aqueous solution of ethylamine, C2H5NH2 to be 12.067.
Tasya [4]

Answer:

The value of K_b of the an ethylamine is 4.121\times 10^{-4}.

Explanation:

The pH of the solution = 12.067

The pOH of the solution = 14 - pH =14-12.607 =1.933

pOH=-\log[OH^-]

1.933=-\log[OH^-]

[OH^-]=0.0117 M

C_2H_5NH_2+H_2O\rightleftharpoons C_2H_5NH_3^{+}+OH^-

Initially

0.342 M                              0     0

At equilibrium

(0.342-x)                             x      x

The value of x = [OH^-]=0.0117 M

The expression of K_bis given as:

K_b=\frac{[C_2H_5NH_3^{+}][OH^-]}{[C_2H_5NH_2]}

K_b=\frac{x^2}{(0.342-x)}

K_b=\frac{(0.0117 )^2}{(0.342-0.0117)}=4.121\times 10^{-4}

The value of K_b of the an ethylamine is 4.121\times 10^{-4}.

7 0
3 years ago
Why would scientists use a spectrometer in space.
solniwko [45]

Answer:

A. To study the chemical composition of the surface of a planet

Explanation:

Strictly speaking, a spectrometer is any instrument used to view and analyze a range (or a spectrum) of a given characteristic for a substance (for example, a range of mass-to-charge values as in mass spectrometry), or a range of wavelengths as in absorption spectrometry like nuclear magnetic radiation spectroscopy

-hope this helps!

6 0
2 years ago
Read 2 more answers
Examples of light effecting chemical change​
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Answer:

burning of wood ,cooking an egg,baking a cake,rusting of iron,digestion of food .

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Which of the following compound is most soluble in water a)glycerol b) ethyl alcohol c) ethylene glycol d)ethyl chloride
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glycerol

Explanation:

it is thick sweet liquid.It is type of alcohol which has 3 OH groups

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Answer:

C B A D

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