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3 years ago

Write the skeleton equation: Cobalt and Sulfur react to produce Cobalt (II) Sulfide

Chemistry

1 answer:

lidiya [134]3 years ago

7 0

Answer:

Co + S = Co2S3

Explanation:

pretend = is the arrow

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Definition of steepest

andrey2020 [161]

<span>Hi, friend.
Steepest - Being steep to the greatest degree.
Steep - S</span>harply angled.
Example: When hiking trails lead straight up mountainsides, they've got a steep incline.
Hope this helps!

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4 years ago

Read 2 more answers

Please help/

inn [45]

Answer:

Choose all the answers that apply. Energy _____. Moves in waves, cannot be created, can be destroyed, is the ability to do work, can change form.

I hope this is correct for you. I am sorry if i am wrong.

Hope this helps!

Have a great day and stay safe! :))))

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3 years ago

Calculate the pH of a solution prepared by dissolving 0.15 mol benzoic acid (C7H5O2H) and 0.30 mol of sodium benzoate (Na C7H5O2

asambeis [7]

Answer : The pH of a solution is, 4.5

Explanation : Given,

Moles of benzoic acid = 0.15 mol

Moles of sodium benzoate = 0.30 mol

Volume of solution = 1.00 L

The dissociation constant for benzoic acid = $K_a=6.5\times 10^{-5}$

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (6.5\times 10^{-5})$

$pK_a=5-\log (6.5)$

$pK_a=4.2$

Now we have to calculate the pH of a solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=4.2+\log [\frac{(\frac{0.30}{1.00L})}{(\frac{0.15}{1.00L})}]$

$pH=4.5$

Therefore, the pH of a solution is, 4.5

8 0

4 years ago

What is wrong with the following statement? Hal says that his teacher is solely responsible for preventing laboratory accident.

exis [7]

Answer:

Hal is wrong because the teacher can instruct the student, but no make all the choices in a lab.Students must always wear ppe (personal protection equipment) , use proper lab protocol, and conduct themselves in a responsible manner. It is NOT the work of a teacher to ensure lab safety, but in fact the responsibility of said students.

3 0

3 years ago

A flask contains 0.180 mol of liquid bromine, br2. determine the number of bromine molecules present in the flask.

Reika [66]

<span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

0.180 mol Br2 ( </span>6.022 x 10^23 molecules / mole ) = 1.084x10^23 molecules Br2

5 0

4 years ago

Read 2 more answers