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2 years ago

A student was studying chemical reactions. He followed these steps in an investigation:

Chemistry

1 answer:

grandymaker [24]2 years ago

4 0

Answer: A

Explanation: Im pretty sure it's A, if you're desperate, go ahead and take my advice. If you're not you probably shouldnt.

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How many electrons are in the highest energy orbital of the element copper?

iris [78.8K]

the answer is 1 the 4s1 electron........................

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3 years ago

Proteins are: amino acids. carbohydrates. minerals. sugars.

FinnZ [79.3K]

Proteins are Amino acids

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3 years ago

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The ionization constant for acetic acid is 1.8 × 10-5, and that for hydrocyanic acid is 4 × 10-10.

mihalych1998 [28]

Answer:

D. [H+] of the acetic acid solution is greater than that of the hydrocyanic acid solution.

Explanation:

$CH_3 COOH(aq)+ H_2 O(l) CH_3 COO^- (aq)+H_3 O^+ (aq)$

Initial 0.1M 0 0

Change -x +x +x

Equilibrium 0.1M-x +x +x

$Ka =\frac {((x)(x))}{(0.1M-x)}$

$1.8\times10^{-5}= \frac {x^2}{(0.1M-x)}$

(-x is neglected) so we get

$1.8\times10^{-5}\times0.1=x^2\\\\x^2=1.8\times10^{-6}$

$x=\sqrt{x^2}=1.34\times10^{-3} M=H^3 O^{+}$ is the $[H^+ ]$ concnetration of acetic acid

$HCN(aq)+ H_2 O(l) CN^- (aq)+H_3 O^+ (aq)$

Initial 0.1M 0 0

Change -x +x +x

Equilibrium 0.1M-x +x +x

$Ka =\frac {((x)(x))}{(0.1M-x)}$

$4.0\times10^{-10}= \frac {x^2}{(0.1M-x)}$

(-x is neglected) so we get

$4.0\times10^{-10}\times0.1=x^2\\\\x^2=4.0\times10^{-11}$

$x=\sqrt{x^2}=6.32\times10^{-6} M=H^3 O^{+}$ is the $[H^+ ]$ concnetration of Hydrocyanic acid

Thus we see here, [H+] of the acetic acid solution $1.34 \times 10^{-3} M$ is greater than that of the hydrocyanic acid solution $6.32 \times10^{-6} M$

Please note∶

To find $[OH^- ]$ we use formula $[OH^- ]= \frac {kw}{([H^+])}$

The value of kw is 1.0×10^(-14)

The $[OH^- ]$ is lesser in each solution

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3 years ago

If Earth was like a hardboiled egg, which part of Earth would the egg shell represent and why?

zzz [600]

I'm thinking its answer choice D. But it might be a good idea to wait and see if someone agrees

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4 years ago

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Find the molar mass of H20. _______ grams per mole

Tpy6a [65]

It would be: 1 * 2 + 16 = 2 + 16 = 18

In short, Your Answer would be Option B

Hope this helps!

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3 years ago