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kifflom [539]
2 years ago
6

The combining power of an element is called ?

Chemistry
1 answer:
Gre4nikov [31]2 years ago
8 0

Answer:

D

Explanation:

Valency is the combining power of an element

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What boundaries of time zones correspond?
jeyben [28]
The boundaries of time zones correspond<span> roughly to lines of longitude

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<span>The time in each successive time zone is one hour different from the times in neighboring time zones. To establish time zones, Earth's rotation rate of 360 degrees of longitude per day was divided by 24 hours. The result shows that Earth turns 15 degrees of longitude per hour.

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7 0
3 years ago
Potassium sulfate has a solubility of 15g/100g water at 40 Celsius. A solution is prepared by adding 39.0g of potassium sulfate
nadya68 [22]

Answer:

5.25 grams of potassium sulfate will get crystallize out.

Explanation:

Solubility of potassium sulfate at 40 °C = 15 g/100 g

This means that at 40 °C 15 g of potassium sulfate will get completely dissolved in 100 of water.

39.0 g of potassium sulfate to 225 g water, carefully heating the solution.

Amount of potassium sulphate will get dissolve in 225 g of water at 40 °C will be:

\frac{15g}{100g} × 225 = 33.75g

Amount of potassium sulfate precipitated out by the solution:

= 39.0 g-33.75 g = 5.25 g

At 40 °C 5.25 g of potassium sulfate will get precipitate out from the solution which means that solution is saturated.

Saturated solution are solution in which solute is dissolved in maximum amount. Further addition of solute results in precipitation of solute form the solution.

5.25 grams of potassium sulfate will get crystallize out.

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8 0
2 years ago
Does a bottle of acetic acid contain a solid or a liquid on a chilly morning with the window open and the laboratory at 10 ∘ C ?
Fofino [41]

Answer is:  a bottle of acetic acid contains a solid.

Acetic or ethanoic acid (CH₃COOH) when undiluted is called glacial acetic acid.

Glacial acetic acid has freezing point (melting point) around 16.6°C, so it will be at solit state.

Vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar  is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.

Acetic acid dissociate in aqueous solution to form hydrogen ions (H⁺) and acetic anion (CH₃COO⁻).

Balanced chemical reaction (dissociation):  

CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).


7 0
2 years ago
Calculate the wavelength and frequency at which the intensity of the radiation is a maximum for a black body at 298 K.
irakobra [83]

Answer:

wavelength (λ) = 2.73 E-4 m

frecuency (f) = 1.10 E12 s-1

Explanation:

Stefan-Boltzmann law:

  • intensity of the radiation for a black body (W) = σ.(T)∧4

∴ σ = 5.670 E-8  W/m²(K)∧4

∴ T = 298 K

⇒ W = (5.670 E-8 W/m²K∧4)×(298 K)∧4

⇒ W = 447.145 W/m² = 447.145 J/s.m²

assuming an area of  1 m²

⇒ W = 447.145 J/s

Rayleigh-Jeans's law:

∴ Black body radiation at a specific wavelength (Bλ(T)):

⇒ Bλ(T) = ( 2 c.k.T ) / (λ)∧4

∴ c = 3 E8 m/s.....velocity of speed

∴ k = 1.38065 E -23 J/K.........Boltzmann's constant

∴ Bλ(T) = 447.145 J/s.m²

⇒ (λ)∧4 = ((2)(3 E8 m/s)(1.38065 E-23 J/K)(298 K)) / (447.145 J/s)

⇒ λ = (5.521 E-15)∧(1/4)

⇒ λ = 2.73 E-4 m

  • f = c/λ

⇒ f = (3 E8 m/s) / (2.73 E-4 m)

⇒ f = 1.10 E12 s-1

8 0
3 years ago
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The location of the electrons in j.j Thomson’s
vladimir1956 [14]

Answer:

The location of the electrons in the Thomson's plum pudding model of the atom are contained in orbitals. These orbitals are what make the element stable or unstable

3 0
3 years ago
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