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il63 [147K]
2 years ago
12

Each element on the periodic table has a unique set of properties: Metal vs nonmetal; number of protons; atomic mass; number of

valence electrons, type of bond it usually forms.
Use the periodic table (Periodic Table) to help you answer the following question.

Which answer below is an accurate list of properties for Bromine?

Question 28 options:

Noble Gas, 17 valence electrons, usually forms covalent bonds with other nonmetals


35 protons, 7 valence electrons, usually forms ionic bonds with group 1 or 2 metals


Metal, non-reactive full outer shell, 8 valence electrons


Nonmetal, 7 valence electrons, can make up to 7 bonds
Chemistry
1 answer:
igomit [66]2 years ago
7 0
The periodic table arranges elements in increasing
atomic number from left to right and top to bottom.
Horizontal rows on the periodic table are periods.
Elements in the same period have the same number of
electron shells.
Vertical columns on the periodic table are groups.
Elements in the same group have the same number of
valence electrons.

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lina2011 [118]

Answer:

\huge\boxed{\sf 75\ mL = 0.02\ gallons}

Explanation:

1 mL = 0.000264 gallons

<em><u>Multiplying both sides by 75</u></em>

75 mL = 0.000264 * 75 gallons

<h2>75 mL = 0.02 gallons</h2>
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True or False: The atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen.
EleoNora [17]
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3 years ago
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At which of the four labeled points on the titration curve below do you expect to find the highest concentration of hydroxide
Lostsunrise [7]

Answer:

D.

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8 0
3 years ago
Starting with 250 mL of a 0.250 M solution of HBr; a) Calculate the initial pH of the solution.b) Calculate the pH after adding
maxonik [38]

Answer:

a.

pH =  0.602

b.

pH = 1.5

c.

pH = 7

d.

pH = 12.1

Explanation:

a ) To calculate the pH, use the following equation:

pH = -log [H+]

Hbr is a strong acid, so the [H+] concentration can be calculated as follow:

[HBr] = 0.250 M

As acid Hbr:

Hbr = H+ + Br-

As strong acid HBr dissociates at all, so

[HBr] = [H+] = 0.250 M

So the pH:

<u>pH = -log [0.250 M] = 0.602</u>

<u></u>

<u>b) Calculate the pH after adding 250 mL of 0.125M NaOH</u>

<u></u>

<u>I</u>n this point, the reactions starts:

<u></u>

HBr + NaOH = H2O + NaBr

- First, we gonna find the mol of each reactant:

HBr:

mol = [M] × L

mol = 0.250 M × 0.250 L

mol = 0.0625 mol HBr

NaOH:

mol = [M] × L

mol = 0.125 M × 0.250L

mol = 0.03125 mol NaOH

In base on the reaction, it’s needed 1 mol of NaOH to neutralize 1 mole of HBr, so to neutralize 0.0625 moles of HBr its needed 0.0625 mol of NaOH:

0.0625 mol HBr – 0.03125 mol HBr = 0.03125 mol HBr

These are the moles free in the solution, and we going to use them to calculate the pH:

pH = -log [ H]

pH = - log [ 0.03125 ] = 1.5

<u>c) Calculate the pH after adding 500 mL of 0.125M NaOH</u>

NaOH:

mol = [M] × L

mol = 0.125 M × 0.500L

mol = 0.0625 mol NaOH

In base on the reaction, it’s needed 1 mol of NaOH to neutralize 1 mole of HBr, so to neutralize 0.0625 moles of HBr its needed 0.0625 mol of NaOH:

0.0625 mol HBr – 0.0625 mol HBr = 0 HBr

pH = 7

<u>d) Calculate the pH after adding 600 mL of 0.125M NaOH.</u>

<u>NaOH:</u>

mol = [M] × L

mol = 0.125 M × 0.600L

mol = 0.075 mol NaOH

In base on the reaction, it’s needed 1 mol of NaOH to neutralize 1 mole of HBr, so to neutralize 0.0625 moles of HBr its needed 0.0625 mol of NaOH:

0.075 mol NaOH – 0.0625 mol NaOH = 00125 NaOH

These are the moles free in the solution, and we going to use them to calculate the pH:

pOH = -log [ OH]

pOH = - log [ 0.0125 ] = 1.90

pH + pOH = 14

pH = 14- pOH = 14 – 1.90 = 12.1

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3 years ago
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