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tiny-mole [99]
2 years ago
13

Which is an example of a physical change?

Chemistry
2 answers:
levacccp [35]2 years ago
8 0

Answer:

salt dissolving

Explanation:

Hope this helps!

lesantik [10]2 years ago
7 0
Salt dissolving is the one
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A person runs 500 ft in 50 seconds how fast are they moving
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If 50% of a radioactive element remains after 4000 years, what is the half-life?
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A half-life means after a certain amount of time, half of that substance will be gone/changed after that time.

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For all of the following questions 20.00 mL of 0.200 M HBr is titrated with 0.200 M KOH.
HACTEHA [7]

Answer :

The concentration of H^+ before any titrant added to our starting material is 0.200 M.

The pH based on this H^+ ion concentration is 0.698

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First we have to calculate the concentration of H^+ before any titrant is added to our starting material.

As we are given:

Concentration of HBr = 0.200 M

As we know that the HBr is a strong acid that dissociates complete to give hydrogen ion H^+ and bromide ion Br^-.

As, 1 M of HBr dissociates to give 1 M of H^+

So, 0.200 M of HBr dissociates to give 0.200 M of H^+

Thus, the concentration of H^+ before any titrant added to our starting material is 0.200 M.

Now we have to calculate the pH based on this H^+ ion concentration.

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pH=-\log [H^+]

pH=-\log (0.200)

pH=0.698

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3 years ago
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