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3 years ago

Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration?

Chemistry

1 answer:

sashaice [31]3 years ago

7 0

Answer:

The answer to your question is: Oxygen (O) and Selenium (Se)

Explanation:

Elements located in group VIA needs to gain 2 electrons to achieve noble gas electron configuration.

Oxygen (O) is located in group VIA so it needs to gain two electrons to become stable.

Strontium (Sr) is located in group IIA so it needs to lose 2 electrons to become stable.

Sodium (Na) is located in group IA so it needs to lose one electron to become stable.

Selenium (Se) is located in group VIA so it needs to gain 2 electrons to become stable.

Bromine (Br) is located in group VIIA so it needs to gain one electron to become stable.

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Chlorophenols impart unpleasant taste and odor to drinking water at concentrations as low as 5 mg/m3. They are formed when the c

trapecia [35]

Answer:

See explaination

Explanation:

Chlorine’s disinfection properties have helped improve the lives of billions of people around the world. Chlorine also is an essential chemical building block, used to make many products that contribute to public health and safety, advanced technology, nutrition, security and transportation.

Please kindly check attachment for the step by step solution of the given problem.

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3 years ago

What is the mass of 3.25 moles of sodium hydroxide (NaOH)?

Dimas [21]

Answer:

1 mole is equal to 1 moles NaOH, or 39.99711 grams.

Explanation:

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3 years ago

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Why might a scientist repeat an experiment if she did not make a mistake in the first one? A) Scientists who repeat experiments

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Answer:

The correct answer is B) it helps to ensure the result are consistent and repeatable.

Explanation:

Scientist generally repeat an experiment if he or she did not make a mistake in the first one to compare the results of two experiment, if there is no difference in the result or values obtainted from the observation of two experiment. he or she become sure that experiment was done in a right way because if there is some error made when experiment was carried out then the result of two same experiment would be different.

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3 years ago

Describe the appearance of the material. Include its color and state (solid or liquid). Pour ¼ cup of water into a small, clear

Alex777 [14]

Answer:

Here the given material is taken and mixed with water.

Explanation:

The amount of material and water taken are same. Hence if it is not soluble in water it should make a dense and flowy paste like material and if it is soluble in water it should this and thicker density of water should remain.

If the amount of water that we are taking is more than the material will float in water if it is not soluble and lighter than water or would sink if it is heavier than water.

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3 years ago

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The ka values for several weak acids are given below. which acid (and its conjugate base) would be the best buffer at ph = 8.0?

Pie

One of the best buffer choice for pH = 8.0 is Tris with Ka value of 6.3 x 10^-9.

To support this answer, we first calculate for the pKa value as the negative logarithm of the Ka value:
pKa = -log Ka

For Tris, which is an abbreviation for 2-Amino-2-hydroxymethyl-propane-1,3 -diol and has a Ka value of 6.3 x 10^-9, the pKa is
pKa = -log Ka
= -log (6.3x10^-9)
= 8.2

We know that buffers work best when pH is equal to pKa:
pKa = 8.2 = pH

Therefore Tris would be a best buffer at pH = 8.0.

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3 years ago

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