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3 years ago

Help plz I'm confused

Chemistry

2 answers:

erik [133]3 years ago

6 0

<u>Answer 45 :</u> This statement is true.

Explanation :

We are taking an example of carbon (C) with atomic number 6 and atomic mass 12.

As we know that the number of protons and number of electrons are equal to the atomic number.

The atomic number of carbon is 6. So, the number of protons and the number of electrons is equal to 6.

And, the number of neutrons = Atomic mass - Atomic number = 12 - 6 = 6

Hence, this statement is true.

<u>Answer 46 :</u> This statement is true.

Explanation :

We are taking an example of oxygen (O) with atomic number 8.

The electronic configuration of oxygen (O) will be,

$1s^22s^22p^4$

Now we have to calculate the number of electrons from the electronic configuration.

The number of electrons = 2 + 2 + 4 = 8

Hence, this statement is true.

9966 [12]3 years ago

6 0

<h2>Answer 1:</h2>

<u>The statement is</u><u> True</u>

<h2>Explanation:</h2>

The number of electrons and protons in any element are the same. Atom as a whole is a neutral particle. Protons are positively charged while electrons are negatively charged. In order to keep the level balanced and keep the atom neutral the net charge must be zero therefore protons and electrons must be the same in order to keep an atom neutral.

<h2>Answer 2:</h2>

<u>The statement is </u><u>True</u>

<h2>Explanation:</h2>

Electron configuration is the distribution of electrons of an atom or molecule or other physical structure in atomic or molecular orbitals. The number of electrons in any particular shell or orbit can be found by the formula 2n² where n is the number of shell. In order to check whether the number of electrons are the same as the electronic configuration, we must see the atomic number because atomic number shows us the total number of electrons in any atom.

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25 mL of 0.10 M aqueous acetic acid is titrated with 0.10 M NaOH(aq). What is the pH after 30 mL of NaOH have been added?

weeeeeb [17]

Answer:

pH = 11.95≈12

Explanation:

Remember the reaction among aqueous acetic acid ( $CH_3COOH$ ) and aqueous sodium hydroxide (NaOH)

$CH_3COOH + NaOH -> CH_3COONa + H_2O$

First step. Need to know how much moles of the substances are present

$0.1 \frac{mol NaOH}{L} * 0.030 L = 0.003 mol NaOH[tex]0.1 \frac{mol CH_3COOH}{L} * 0.025 L= 0.0025 mol CH_3COOHSecond step. Know wich substance is in excess.0.0025 mol CH_3COOH * [tex]1 mol NaOH/ 1 mol CH_3COOH$ = 0.0025 mol NaOH

0.003 mol NaOH * $1 mol CH_3COOH$ / 1 mol NaOH = 0.003 mol CH_3COOH[/tex]

NaOH is in excess. Now, how much?

0.003 mole NaOH - 0.0025 mole NaOH = 0.0005 mole NaOH

Then, that amount in excess would be responsable for the pH.

Third step. Know the pH

Remember that pH= -log[H+]

According to the dissociation of water equilibrium

Kw=[H+]*[OH-]= 10^(-14)

The dissociation of NaOH is

NaOH -> $Na^{+} + OH^{-}$

Now, concentration of OH^{-}[/tex] would be given for the excess of NaOH.

[OH-]= 0.0005 mole / 0.055 L = 0.00909 M

Careful: we have to use the total volumen

Les us to calculate pH

$pH= -log [H+]\\pH= -log \frac{K_w}{[OH-]} \\pH= 11.95$

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3 years ago

Draw the product formed by the reaction of potassium t-butoxide with (1s,2s)-1-bromo-2-methyl-1-phenylbutane (shown below). (dra

VikaD [51]

<span>You have to use a Newman projection to make sure that the H on C#2 is anti-coplanar with the Br on C#1. (Those are the two things that are going to be eliminated to make the alkene.)

My Newman projection looks like this when it's in the right configuration:
Front carbon (C#2) has ethyl group straight up, H down/left, and CH3 down/right
Back carbon (C#1) has H straight down, Ph up/left, and Br up/right.

Then when you eliminate the H from C#2 and the Br from C#1, you will have Ph and the ethyl group on the same side of the molecule, and you'll have the remaining H and CH3 on the same side of the molecule.

This is going to give you (Z)-2-methyl-1-phenyl-1-butene.</span>

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3 years ago

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Anna [14]

Answer:

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Explanation:

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2 years ago

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Elena L [17]

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Lelu [443]

Answer:

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I was thinking that you could say this:

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3 years ago

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Help plz I'm confused ​

Help plz I'm confused