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Travka [436]
3 years ago
15

Help please thank you :)

Chemistry
1 answer:
Aneli [31]3 years ago
6 0
Octet rule says that elements with less electrons in their valence shell either tend to lose electron or combine with other element to attain configuration of its nearest noble gas. For example, Na has electronic configuration of 1s2, 2s2, 2p6, 3s1 whereas Cl has electronic configuration of 1s2, 2s2, 2p6, 3s2, 3p5. Chlorine is one of the most electronegative element therefore it will accept one electron from donor and complete its octet. Whereas, Na is one of the electropositive element therefore it will lose its one electron from valence shell to attain stable octet.

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a friend is trying to describe a material to you. which of the following is not a description of a physical property of the subs
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C. when combined with water, it fizzes.
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3 years ago
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Can someone do these? Brainliest included
mixas84 [53]

Answer:

Explanation:

6.         p⁺      e⁻

Ca²⁺    20     18

F⁻          9      10

O²⁻        8      10

Na⁺       11      10

7. Physical properties of matter are properties that can be measured or observed without matter changing to an entirely different substance. These include odor, boiling point, melting point, density, electrical conductivity and heat conductivity.

Separation of mixture:

Chromatography involves solvent separation on a solid medium.

Distillation takes advantage of differences in boiling points.

Evaporation removes a liquid from a solution to leave a solid material.

Filtration separates solids of different sizes.

Funnel partitioning with solvents. Solvent dissolves one component but not the other.

8.Bulk Elements => Carbon, Hydrogen, Oxygen, Nitrogen, Sulfur & Phosphouous

Microminerals are those minerals needed in less than 100 mg quantities. Trace minerals or trace elements are usually needed in microgram quantities. Microminerals include iron, zinc, copper, iodine, fluoride, chromium, cobalt, selenium, manganese, and molybdenum.

Diatomic Molecules => H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

9. Electron Configurations

    Na: 1s²2s²2p⁶3s¹ => valence = 3s¹

    N:   1s²2s²2p³ => valence = 2s²2p³

    Al:  1s²2s²2p⁶3s²3p¹ => valence = 3s²3p¹

Valence is the highest principle quantum number (or, principle energy level  ~ ring) in the electron configurations.

10.moles of glucose = 450g/180.16 g/mol =2.50 moles

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7 0
3 years ago
(a) what is the approximate ductility (%el) of a brass that has a yield strength of 230 mpa (33360 psi)?
ss7ja [257]

Based on the calculations, the approximate ductility (%el) of this brass is equal to 2.3%.

<u>Given the following data:</u>

  • Yield strength = 230 mpa (33360 psi).

<h3>What is ductility?</h3>

Ductility can be defined as an important property of a material which determines its ability to become elongated due to the application of stress.

Mathematically, the ductility of a material can be expressed as percentage elongation in length:

\% el = \frac{\Delta L}{L_i} =\frac{L_f - L_i}{L_i}

<u>Where:</u>

  • L_i is the original length.
  • L_f is the final length.
  • \Delta L is the yield strength.

For this exercise, let us assume the original length of this brass is equal to 100 meters.

Substituting the parameters into the formula, we have;

\% el = \frac{230}{100}

Ductility = 2.3%.

Read more on ductility here: brainly.com/question/828860

3 0
2 years ago
If stomach acid has a ph of 1.3, what is the pOH
Mekhanik [1.2K]
I think the answer is -12.7
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3 years ago
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Otrada [13]

Answer:

Explanation:

Communicating junctions or gap juctions consider direct substance correspondence between contiguous cell cytoplasm through dispersion without contact with the extracellular liquid.

6 0
3 years ago
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