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Andrew [12]
3 years ago
13

Which of these elements has the smallest atomic radius?

Chemistry
1 answer:
shutvik [7]3 years ago
4 0

Answer:

Its Br on Ap ex

Explanation:

Just got it wrong ;( it's B

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The acid dissociation constant Ka of boric acid (H3BO3) is 5.8 times 10^-10. Calculate the pH of a 4.4 M solution of boric acid.
madam [21]

Answer: The pH of a 4.4 M solution of boric acid is 4.3

Explanation:

H_3BO_3\rightarrow H^+H_2BO_3^-

at t=0  cM              0             0

at eqm c-c\alpha        c\alpha          c\alpha  

So dissociation constant will be:

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

Give c= 4.4 M and \alpha = ?

K_a=5.8\times 10^{-10}

Putting in the values we get:

5.8\times 10^{-10}=\frac{(4.4\times \alpha)^2}{(4.4-4.4\times \alpha)}

(\alpha)=0.000011

[H^+]=c\times \alpha

[H^+]=4.4\times 0.000011=4.8\times 10^{-5}M

Also pH=-log[H^+]

pH=-log[4.8\times 10^{-5}]=4.3

Thus pH of a 4.4 M H_3BO_3 solution is 4.3

3 0
3 years ago
The atomic particle with a charge of -1.6 x 10-19 C is
kobusy [5.1K]

no sefdrcdftrgfkjj jhhhgfd

7 0
2 years ago
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How many hydrogen (H) atoms are in 1 molecule of (NH4)2S ?
Alex73 [517]
Im not sure but it could be 4 (H)
3 0
3 years ago
A boxed 10 kg computer monitor is dragged by friction 5.5 m up along the moving surface of a conveyor belt inclined at an angle
Ede4ka [16]

Answer:

A lot, because it belt inclined at an angle of 36.9° above the horizontal.

I need points haha!

5 0
2 years ago
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Which of the following polyatomic ions will form an ionic compound with a single sodium ion?
vaieri [72.5K]

Answer:

Option B, HCO3 1-

Explanation:

The valence of Sodium ion is +1 and the valence of HCO3 is -1. Thus, sodium ion has an extra electron to be donated to complete its outer shell  while HCO3 needs an electron to complete its outer shell

Hence Na will combine with HCO3 to form NaHCO3

Option B is correct

5 0
3 years ago
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