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4 years ago

Question 5(Multiple Choice Worth 3 points)

Chemistry

1 answer:

Travka [436]4 years ago

8 0

Answer: B. Stay the same

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Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2 is 4.6 * 10-4.

Lostsunrise [7]

Answer: pH of solution is = 1.82

Explanation:

$HNO_2\rightarrow H^+NO_2^-$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.500 M and $\alpha$ = ?

$K_a=4.6\times 10^{-4}$

Putting in the values we get:

$4.6\times 10^{-4}=\frac{(0.500\times \alpha)^2}{(0.500-0.500\times \alpha)}$

$(\alpha)=0.030$

$[H^+]=c\times \alpha$

$[H^+]=0.500\times 0.030=0.015$

Also $pH=-log[H^+]$

$pH=-log[0.015]=1.82$

Thus pH of a 0.500 M $HNO_2$ solution is 1.82

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3 years ago

The citizens of a town are aware of climate change, and they want to make changes to control it. One change they consider is rep

il63 [147K]

The answer is C because it's the only that pertains to climate change. The other answers are more about local economy.

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3 years ago

Which statement is best supported by the diagram?

wlad13 [49]

Answer:

The answer is A.

Explanation:

when the ball gets to R and S then that's when gravity starts to take over instead of kinetic energy so therefore its potential energy

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3 years ago

Read 2 more answers

The element iodine would be expected to form covalent bond(s) in order to obey the octet rule. Use the octet rule to predict the

zhannawk [14.2K]

Answer:

HI (hydrogen iodide).

Explanation:

Hello,

In this case, since iodine is in group VIIA, it has seven valence electrons at its outer shell, which means that it only needs one bond to attain the octet. Moreover, since hydrogen has just one electron at its outer shell, one hydrogen turns out enough to obey the octet when hydrogen and iodine bond as shown below:

$H-I$

Therefore, the required formula is:

$HI$

Which is hydrogen iodide.

Best regards.

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3 years ago

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Rus_ich [418]

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3 years ago