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ankoles [38]
3 years ago
7

6. Which of the following pH values would have the highest concentration of hydroxide ions? *

Chemistry
1 answer:
jeyben [28]3 years ago
4 0

pH. 10 because it is strong base

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A sample of gas has an intial volume of 22.8 L at a pressure of 1.65 atm. If the sample is compressed to a volume of 10.7 L, wha
almond37 [142]

 The  pressure  of the  gas  is 3.52 atm


<u><em>calculation</em></u>

This is calculated using the Boyle's  law  formula

that is  P1V1= P2V2  where;

P1 = 1.65   atm

V1 =22.8 L

P2 =? atm

V2  = 10.7 L


make P2 the subject of the formula by  dividing    both side by V2

P2 = P1V1 / V2

P2 = (1.65 atm x 22.8 l) / 10.7 L  =  3.52   atm

4 0
3 years ago
A container of hydrogen at 172 kPa was decreased to 85.0 kPa producing a new volume of 3L. What was the original volume?
Aneli [31]

Answer:

<h2>The answer is 1.48 L</h2>

Explanation:

In order to find the original volume we use the same for Boyle's law which is

P_1V_1 = P_2V_2

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the original volume

V_1 =  \frac{P_2V_2}{P_1}  \\

From the question

P1 = 172 kPa = 172000 Pa

P2 = 85 kPa = 85000 Pa

V2 = 3 L

We have

V_1 =  \frac{85000 \times 3}{172000}  =  \frac{255000}{172000}  =  \frac{255}{172}  \\  = 1.482558139...

We have the final answer as

<h3>1.48 L</h3>

Hope this helps you

4 0
3 years ago
Which of the following substances is the most soluble in water?
GuDViN [60]
A. Sodium Chloride.
5 0
3 years ago
Read 2 more answers
What is the electron configuration of an element with atomic number 20? A. 1s2 2s2 2p6 3s2 3p5 B. 1s2 2s2 2p6 3s2 3p6 C. 1s2 2s2
Cerrena [4.2K]

D.  The number of electrons equals the atomic number for a neutral element.  Each number after the letter refers to the number of electrons in that shell.  So for D, 2+2+6+2+6+2 = 20 electrons, which is equal to the atomic number.

8 0
3 years ago
Read 2 more answers
Which statements accurately describe Dmitri Mendeleev’s contributions to the development of the periodic table? Check all that a
Varvara68 [4.7K]

Answer:

  • <em><u>Mendeleev produced the first orderly arrangement of known elements.</u></em>

  • <em><u>Mendeleev used patterns to predict undiscovered elements.</u></em>

Explanation:

  • <u>Mendeleev produced the first orderly arrangement of known elements and used patterns to predict the undiscovered elements.</u>

        Those two statments are true.

For the time being there were some 62 known elements. Before Medeleev some schemes to order part of the elements were proposed, but Medeleev showed the relationship between the atomic mass and the properties of the elements (supports second choice). This arrangement is known as the periodic table.

More importantly, Mendeleev predicted correctly the existance and properties of unknown elements, which is his major contribution: he left blanket spaces which where gradually filled when new elements where discovered (this supports the fourth choice).

The first modern chemistry book was written by Antoine Lavoisier (this discards first option).

Mendeleev ordered the elements by increasing mass number (this discards third choice), which was corrected later by the scientist Henry Moseley, who ordered the elements by increasing atomic number (number of protons).

Isotopes were not known by Mendeleev times, so this discards the last option.

8 0
3 years ago
Read 2 more answers
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