Energy would be needed to cause an electron to be a valence electron.

Mass cannot be created nor destroyed as the law of conservation of mass states.

7 0

4 years ago

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When working with repelling magnets,

Free_Kalibri [48]

Pulled apart (moved with the magnetic force)

5 0

3 years ago

ANSWER: b <br> i hope i helped

Sergio [31]

Answer:

thanks

Explanation:

7 0

3 years ago

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The equilibrium constant for the dissociation of acetic acid at 25oC is 1.85x10-5. What will be the equilibrium concentration of

Gre4nikov [31]

Answer:

Equilibrium concentration of $H^{+}$ is $1.4\times 10^{-3}M$

Explanation:

Construct an ICE table to calculate changes in concentration at equilibrium.

$CH_{3}COOH\rightleftharpoons CH_{3}COO^{-}+H^{+}$

I: 0.1 0 0

C: -x +x +x

E: 0.1-x x x

$\frac{[CH_{3}COO^{-}][H^{+}]}{[CH_{3}COOH]}$ = $K_{a}(CH_{3}COOH)$

(species inside third bracket represent equilibrium concentrations)

$\frac{x^{2}}{0.1-x}=1.85\times 10^{-5}$

or, $x^{2}+(1.85\times 10^{-5})x-(1.85\times 10^{-6})=0$

So, $x=\frac{-(1.85\times 10^{-5})+\sqrt{(1.85\times 10^{-5})^{2}+(4\times 1.85\times 10^{-6})}}{2}$ M

or, $x=1.4\times 10^{-3}M$

So, equilibrium concentration of $H^{+}$ = $[H^{+}]$ =x= $1.4\times 10^{-3}M$

8 0

4 years ago