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3 years ago

14

Q- Which two positions show the location of the moon in its gibbous phases as seen from Earth?

1 answer:

Phoenix [80]3 years ago

4 0

Answer: 6 & 8

Explanation:

I got it correct on my test hope this helped

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Explain why arginine is a basic amino acid

Mumz [18]

Answer:

There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.

<h2>Hope it helps you.</h2>

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2 years ago

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Draw the best Lewis structure for NH3 by filling in the bonds, lone pairs, and formal charges. (Assign bonds, lone pairs, radica

kiruha [24]

Answer : The Lewis-dot structure of $NH_3$ is shown below.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $NH_3$

As we know that hydrogen has '1' valence electron and nitrogen has '5' valence electrons.

Therefore, the total number of valence electrons in $NH_3$ = 5 + 3(1) = 8

According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.

Now we have to determine the formal charge for each atom.

Formula for formal charge :

$\text{Formal charge}=\text{Valence electrons}-\text{Non-bonding electrons}-\frac{\text{Bonding electrons}}{2}$

$\text{Formal charge on N}=5-2-\frac{6}{2}=0$

$\text{Formal charge on }H_1=1-0-\frac{2}{2}=0$

$\text{Formal charge on }H_2=1-0-\frac{2}{2}=0$

$\text{Formal charge on }H_3=1-0-\frac{2}{2}=0$

Hence, the Lewis-dot structure of $NH_3$ is shown below.

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2 years ago

Which of the following statements below correctly describes the parts of an atom that determine the atom's identity and chemical

stich3 [128]

Answer:

B protons determine indentity and valence electrons determine chemical properties.

:)

Explanation:

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3 years ago

Hich of these correctly defines the pOH of a solution?

kramer

The log of the hydronium ion concentration

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Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that

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Answer:

If the substance is a liquid or solid, production of an odor would indicate a chemical change.

Explanation:

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