2 years ago

After air enter the body through the nose or mouth it then goes to the what?

Chemistry

1 answer:

spin [16.1K]2 years ago

8 0

Answer:

your lungs

Explanation:

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Which of the following is a property of a pure substance?

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D.) the original components retain their individual properties

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The process of splitting and Atom into two lighters atoms is called?

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Which of the following is an example of chemical energy being released or stored?

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2 years ago

What is the ratio of [a–]/[ha] at ph 2.75? the pka of formic acid (methanoic acid, h–cooh) is 3.75?

Varvara68 [4.7K]

The dissociation of formic acid is:

$HCOOH \rightleftharpoons HCOO^{-} + H^{+}$

The acid dissociation constant of formic acid, $k_a$ is:

$k_a = \frac{[HCOO^{-}] [H^{+}]}{HCOOH}$

Rearranging the equation:

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}$

pH = 2.75

$pH = -log[H^{+}]$

$[H^{+}]= 10^{-2.75} = 1.78 \times 10^{-3}$

$pk_a = 3.75$

$k_a = 10^{-3.75} = 1.78\times 10^{-4}$

Substituting the values in the equation:

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}$

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{1.78\times 10^{-4}}{1.78\times 10^{-3}}$

Hence, the ratio is $\frac{1}{10}$ .

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2 years ago

1. It is the place near the coast where sea water and fresh water mixes and is called “nurseries

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Estuaries are often called the “nurseries of the sea”

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Because so many marine animals reproduce and spend the early part of their lives there.

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