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Olegator [25]
3 years ago
14

Which of the following best summarizes what happens in a displacement reaction?

Chemistry
1 answer:
pav-90 [236]3 years ago
3 0

Answer:

C

Explanation:

Here's an example of displacement reaction:

2 Al (s) + 3 CuSO4 (aq) -> 3 Cu (s) + Al2(SO4)3 (aq)

note that aluminium and copper are elements,

copper II sulphate and aluminium sulphate are compound

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What is the ph of 0.450 m al(no3)3 [ka for al3+(aq) = 1.00x10-5]? express your answer to two decimal places?
White raven [17]

Answer : The pH of the solution is, 2.67

Explanation :

The equilibrium chemical reaction is:

                           Al^{3+}+H_2O\rightarrow Al(OH)^{2+}+H^+

Initial conc.       0.450                   0               0

At eqm.           (0.450-x)                 x               x

As we are given:

K_a=1.00\times 10^{-5}

The expression for equilibrium constant is:

K_a=\frac{(x)\times (x)}{(0.450-x)}

Now put all the given values in this expression, we get:

1.00\times 10^{-5}=\frac{(x)\times (x)}{(0.450-x)}

x=0.00212M

The concentration of H^+ = x = 0.00212 M

Now we have to calculate the pH of solution.

pH=-\log [H^+]

pH=-\log (0.00212)

pH=2.67

Therefore, the pH of the solution is, 2.67

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3 years ago
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As a gas changes to a solid, energy<br> A. is not used.<br> B. is released.<br> C. is absorbed.
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Explanation:

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