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Neko [114]
3 years ago
9

Match the element with its number of valence electrons. Match Term Definition: Helium Aluminum Fluorine Sodium A) 1 B) 2 C) 3 D)

7
Chemistry
2 answers:
wariber [46]3 years ago
5 0

Helium- 2

Aluminum- 3

Fluorine- 7

Sodium- 1

Hope I helped.

vampirchik [111]3 years ago
3 0

<u>Explanation:</u>

Valence electrons are defined as the electrons that are present in the outermost shell of an atom.

  • Helium is the 2nd element of the periodic table having electronic configuration of 1s^2

This element has 2 electrons in its outermost shell. So, it has 2 valence electrons. The correct answer is Option B.

  • Aluminium is the 13th element of the periodic table having electronic configuration of 1s^22s^22p^63s^23p^1

This element has 3 electrons in its outermost shell. So, it has 3 valence electrons. The correct answer is Option C.

  • Fluorine is the 9th element of the periodic table having electronic configuration of 1s^22s^22p^5

This element has 7 electrons in its outermost shell. So, it has 7 valence electrons. The correct answer is Option D.

  • Sodium is the 11th element of the periodic table having electronic configuration of 1s^22s^22p^63s^1

This element has 1 electron in its outermost shell. So, it has 1 valence electron. The correct answer is Option A.

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Proteins are a class of macromolecules that perform a diverse range of functions for the cell. They help in metabolism by providing structural support and by acting as enzymes, carriers, or hormones. The building blocks of proteins (monomers) are amino acids.

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Mercury’s natural state is where the atoms are close to each other but are still free to pass by each other. In which state(s) c
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Mercury naturally exists in Liquid state.

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The AP Biology teacher is measuring out 638.0 g of dextrose (C6H12O6) for a lab. How many moles of dextrose is this equivalent t
Katena32 [7]

The AP Biology teacher is measuring out 638.0 g of dextrose (C6H12O6) for a lab the moles of dextrose is this equivalent to is 3.6888 moles.

<h3>What are moles?</h3>

A mole is described as 6.02214076 × 1023 of a few chemical unit, be it atoms, molecules, ions, or others. The mole is a handy unit to apply due to the tremendous variety of atoms, molecules, or others in any substance.

To calculate molar equivalents for every reagent, divide the moles of that reagent through the moles of the restricting reagent. The calculation is follows:

  • 655/12 x 6 + 12+ 16 x 6
  • = 655/ 180 = 3.6888 moles.

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What are the benefits and dangers of the Iron element in our daily life?
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3 years ago
A 25.0-mL sample of 0.150 M hydrocyanic acid is titrated with a 0.150 M NaOH solution. The Ka of hydrocyanic acid is 4.9 × 10-10
lara [203]

Answer:

The pOH = 1.83

Explanation:

Step 1: Data given

volume of the sample = 25.0 mL

Molarity of hydrocyanic acid = 0.150 M

Molarity of NaOH = 0.150 M

Ka of hydrocyanic acid = 4.9 * 10^-10

Step 2: The balanced equation

HCN + NaOH → NaCN + H2O

Step 3: Calculate the number of moles hydrocyanic acid (HCN)

Moles HCN = molarity * volume

Moles HCN = 0.150 M * 0.0250 L

Moles HCN = 0.00375 moles

Step 3: Calculate moles NaOH

Moles NaOH = 0.150 M * 0.0305 L

Moles NaOH = 0.004575 moles

Step 4: Calculate the limiting reactant

0.00375 moles HCN will react with 0.004575 moles NaOH

HCN is the limiting reactant. It will completely be reacted. There will react 0.00375 moles NaOH. There will remain 0.004575 - 0.00375 = 0.000825 moles NaOH

Step 5: Calculate molarity of NaOH

Molarity NaOH = moles NaOH / volume

Molarity NaOH = 0.000825 moles / 0.0555 L

Molarity NaOH = 0.0149 M

Step 6: Calculate pOH

pOH = -log [OH-]

pOH = -log (0.0149)

pOH = 1.83

The pOH = 1.83

6 0
3 years ago
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