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sergeinik [125]
3 years ago
11

Which of the following involves a change in physical properties only?

Chemistry
2 answers:
natima [27]3 years ago
6 0
Burning wood in a fire
Mnenie [13.5K]3 years ago
5 0

Answer: maybe mixing with an acid? They are all very similar

Explanation:

Maybe because the different acids have different atoms and molecules

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Please helpWhat’s the pH of a solution of ammonia that has a concentration of 0.335 M? The Kb of ammonia is
natta225 [31]

From the calculation, the pH of the solution is 4.85.

<h3>What is the pH?</h3>

The pH is defined as the hydrogen ion concentration of the solution. We have the ICE table as;

         HA    +    H2O ⇔     H3O^+    +    A^-

I       0.335                          0                0

C     -x                                  +x              +x

E   0.335 - x                         x                x

Ka = 1 * 10^-14/Kb

Ka = 1 * 10^-14/1.8 × 10^–5

Ka = 5.56 * 10^-10

Ka = [H3O^+] [A^-]/[HA]

But  [H3O^+] = [A^-] = x

5.56 * 10^-10 = x^2/ 0.335 - x

5.56 * 10^-10(0.335 - x ) =  x^2

1.86  * 10^-10 - 5.56 * 10^-10x =  x^2

x^2 + 5.56 * 10^-10x - 1.86  * 10^-10 = 0

x=0.000014 M

Now;

pH = -log 0.000014 M

pH = 4.85

Learn more about pH:brainly.com/question/15289741

#SPJ1

7 0
2 years ago
PLZ HELP ME NEED HELP
Ronch [10]
D. Since it's atomic # is 14 it has 14 electrons and it has 4 valance electrons because it is 4 over.
8 0
3 years ago
Delta H equals 98.8 KJ, and Delta S equals 141.5 J/K. Is this reaction spontaneous or nonspontaneous at high and low pressure
Softa [21]
A is the answer

Like that high and low
8 0
3 years ago
When a heavy atom is split in a fission reaction, the daughter nuclei that form have higher binding energies than the parent nuc
AlladinOne [14]
True because the parents have less energy now
7 0
3 years ago
Read 2 more answers
Question in pic! Thank u so much in advance for responding
romanna [79]

If Cf collides with an alpha particle, this particle will be in the reactants side on the equation.

So reactants side:

^{242}_{98}Cf+^4_{2^{}}\alpha^{}

It will produce 242+4-1 = 245

And 98 + 2 = 100

So products side will be:

^{245_{}}_{100}Fm+^1_0\text{n}

Answer:

^{245}_{100}Fm

6 0
1 year ago
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