4 years ago

How to do question 23

Chemistry

1 answer:

Advocard [28]4 years ago

7 0

Answer:

Explanation:

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A solution prepared by dissolving 0.100 mole of propionic acid in enough water to make 1.00 L of solution is observed to have a

torisob [31]

Answer:

C) $k_a=1.3\times 10^{-5}$

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,

pH = - log [H⁺]

The expression of the pH of the calculation of weak acid is:-

$pH=-log(\sqrt{k_a\times C})$

Where, C is the concentration = 0.5 M

Given, pH = 2.94

Moles = 0.100 moles

Volume = 1.00 L

So, $Molarity=\frac{Moles}{Volume}=\frac{0.100}{1.00}\ M=0.100\ M$

C = 0.100 M

$2.94=-log(\sqrt{k_a\times 0.100})$

$\log _{10}\left(\sqrt{k_a0.1}\right)=-2.94$

$\sqrt{0.1}\sqrt{k_a}=\frac{1}{10^{2.94}}$

$k_a=1.3\times 10^{-5}$

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3 years ago

Which of the following nonmetals forms a gas commonly found in our atmosphere? Rn,Cl,I,or N

vampirchik [111]

N, our atmosphere is about 80% nitrogen(N) and about 20% oxygen(O)

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4 years ago

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Which statements about the Gulf Stream are true? Choose all answers that are correct. The Gulf Stream is a cyclic change in the

iVinArrow [24]

Answers:

B, C, and D

Explanation:

B. True. The direction is generally northward, although it turns more to the east off North Carolina (see map).

C. True. The Gulf Stream is an ocean current, because it flows across the Atlantic Ocean.

D. True. It transports warm water from the Gulf of Mexico and the Caribbean towards Iceland and the British Isles.

A. Wrong. The Gulf Stream is not cyclic. It always flows in the same direction, roughly northeast.

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4 years ago

Why would a student use rate laws in this investigation

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If you use rate laws then your answer will be more supported. Laws can not change, so if you use rate laws then the student will get a more accurate answer then if they don’t use rate laws.

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When substances go through chemical changes, which of the following will always happen? A. Exactly one new substance will form a

tiny-mole [99]

I think b is the answer

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4 years ago

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