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Irina-Kira [14]
3 years ago
9

If you examined the human body on a chemical composition basis, which of the following combinations of elements would be most co

mmon?? (A) C, H, Ca, Cl (B) O, C, P, S (C) O, C, H, N (D) O, C, N, Na (E) C, N, Ca, S
Chemistry
1 answer:
Harlamova29_29 [7]3 years ago
5 0

Answer:

(C) O, C, H, N

Explanation:

<u>Roughly 96% of mass of human body is made up of four elements which are oxygen, carbon, nitrogen and hydrogen.</u>

Oxygen and hydrogen are predominantly found in the water, which makes up about 60% of body's weight. Carbon is synonymous with the life. The central role of carbon is due to fact that it has four bonding sites which allow for building of long and complex chains of the molecules. Moreover, these carbon bonds can be formed and also be broken with amount of energy which makes life alive. Nitrogen is found in organic molecules, including amino acids which make up the proteins, and nucleic acids which make up the DNA.

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________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds
olga_2 [115]

<u>Hydrogen bonds </u>are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.

  • The hydrogen bond is weak bond.
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  • The hydrogen bond is occur in polar , contently bond atoms in different molecules.
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2 years ago
The tilt of the Earth on its axis causes
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The seasons. This is because when Earth is on an angle, different parts of the world get different amounts of heat, making temperatures different, and therefore changing the environment.
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3 years ago
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In general the state of matter with the most energy is ?
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<u>Gas</u>

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Where is the most of the mass of an atom located?
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Rank the following in order of decreasing acid strength in aqueous solution: HCl, HOCl, HOBr,HOI.
I am Lyosha [343]

Answer:

A) HCl > HClO > HBrO > HIO

Explanation:

The strength of an acid is related to the acid dissociation constant (Ka). This is the equilibrium constant for an acid. The higher the Ka, the stronger the acid.

An easier way to compare the strength of acids is through their pKa, where

pKa = -log Ka

The lower the pKa, the stronger the acid.

Let's consider the following acids and their pKa values:

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A) HCl > HClO > HBrO > HIO

6 0
3 years ago
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