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jeyben [28]
3 years ago
7

Substances made of two or more elements which are not chemically bonded are known as

Chemistry
1 answer:
11111nata11111 [884]3 years ago
8 0
Substances that are not chemically bonded are mixtures.
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Consider an exceptionally weak acid, HA, with a Ka = 1x10 -20 . You make a 0.1M solution of the salt Na
Vedmedyk [2.9K]

Answer:

pH=13

Explanation:

Hello,

In this case, given the acid, we can suppose a simple dissociation as:

HA\rightleftharpoons H^+ + A^-

Which occurs in aqueous phase, therefore, the law of mass action is written by:

Ka=\frac{[H^+][A^-]}{[HA]}

That in terms of the change x due to the reaction's extent we can write:

1x10^{-20}=\frac{x*x}{0.1M-x}

But we prefer to compute the Kb due to its exceptional weakness:

Kb=\frac{Kw}{Ka}=\frac{1x10^{-14}}{1x10^{-20}}  =1x10^{-6}

Next, the acid dissociation in the presence of the base we have:

Kb=\frac{[OH^-][HA]}{[A^-]}=1x10^{6}=\frac{x*x}{0.1-x}

Whose solution is x=0.0999M which equals the concentration of hydroxyl in the solution, thus we compute the pOH:

pOH=-log([OH^-])=-log(0.0999)=1

Finally, since the maximum scale is 14, we can compute the pH by knowing the pOH:

pH+pOH=14\\\\pH=14-pOH=14-1\\\\pH=13

Regards.

5 0
3 years ago
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A hypothesis is made before the experiment is conducted. <br> True or fasle
Viefleur [7K]

It should be at beginning. A hypothesis is called an educated guess of what might happen in the experiment.

Please brainliest

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True or False - Changing the temperature will not affect the pressure of the mixture?
irina [24]
The answer would most likely be true.
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Answer:

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2.A

3.C

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8SnCl4<br> How many atoms
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