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Kobotan [32]
3 years ago
15

About 20-25% of the 92 natural elements are known to be essential to life. which four of these elements make up approximately 96

% of living matter?
a.carbon, sodium, hydrogen, nitrogen
b.carbon, oxygen, phosphorus, hydrogen
c.oxygen, hydrogen, calcium, nitrogen
d.carbon, hydrogen, nitrogen, oxygen
e.carbon, oxygen, nitrogen, calcium
Chemistry
1 answer:
Gnom [1K]3 years ago
5 0
E. Carbon, Oxygen, Nitrogen, & Calcium.
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Write the Ka expression for an aqueous solution of hydrofluoric acid: (Note that either the numerator or denominator may contain
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Answer:

Ka = ( [H₃O⁺] . [F⁻] ) / [HF]

Explanation:

HF is a weak acid which in water, keeps this equilibrium

HF (aq)  +  H₂O (l)  ⇄  H₃O⁺ (aq)  +  F⁻ (aq)      Ka

2H₂O (l)  ⇄  H₃O⁺ (l)  +  OH⁻ (aq)   Kw

HF is the weak acid

F⁻ is the conjugate stron base

Let's make the expression for K

K = ( [H₃O⁺] . [F⁻] ) / [HF] . [H₂O]

K . [H₂O] = ( [H₃O⁺] . [F⁻] ) / [HF]

K . [H₂O] = Ka

Ka, the acid dissociation constant, includes Kwater.

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Chlorophyll molecules are specifically arranged in and around pigment protein complexes called photosystems, which are embedded in the thylakoid membranes of chloroplasts.

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If this was the appropriate answer make sure to mark as the brainliest!
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