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zzz [600]
3 years ago
15

How does water’s ability to form hydrogen bonds explain why ice is less dense than liquid water?

Chemistry
1 answer:
Karolina [17]3 years ago
3 0

Answer:

As water freezes, a crystalline structure preserved by hydrogen bonding is formed by water molecules. Less dense than liquid water is solid water, or ice. Ice is less dense than water since molecules are pulled farther apart by the direction of hydrogen bonds, which decreases density.

Explanation:

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Consider a galvanic cell composed of the SHE and a half-cell using the following reaction: Ag+(aq) + e− → Ag(s)
MissTica

Answer:

a. 0.80V b. 2Ag⁺(aq) + H2(g) ⇄ 2Ag(s) +2H⁺(aq) c. i) 0.88 ii) 1.03 d. Cell is a ph meter with the potential being a function of hydrogen ion concentration

Explanation:

a. The two half cell reactions are

1. 2H⁺(aq) +2e⁻ → H₂(g) Eanode = 0.00V

2. Ag⁺(aq) + e⁻ → Ag(s) Ecathode = 0.80V

The balanced cell reaction is

2Ag(aq)⁺ + H₂(g) ⇄  2Ag(s) + 2H⁺(aq)

therefore Ecell = Ecathode - Eanode = 0.80 - 0.00 = +0.80V

b. Since the Ecell is positive, the spontaneous cell reaction under standar state conditions is

2Ag(aq)⁺ + H₂(g) ⇄  2Ag(s) + 2H⁺(aq)

c. Use Nernst Equation

E = Ecell - (0.0592/n)log([H⁺]/[Ag⁺]²[P H₂]), where n is the number of moles of Ag and P H₂= 1.0 atm

i) E = 0.80 - (0.0592/2)log(4.2x10^-2)/(1.0)²(1.0) = 0.88V

ii) E =  0.80 - (0.0592/2)log(9.6x10^-5)/(1.0)²(1.0) = 1.03V

d . From the above calculation we can conclude that the cell acts as a pH meter as a change in hydrogen ion concentration results in a change in the potential of the cell. A change of ph of 2.64 changes the E of cell by 0.15 V.

5 0
2 years ago
The results of rutherford's experiment, in which alpha particles were fired toward thin metal foils, were surprising because ___
Zanzabum

The results of Rutherford's experiment were surprising as most of the alpha particles went straight without any deflection

<h3>Rutherford's Gold Foil experiment:</h3>

During the experiment, Rutherford directed beams of alpha particles at the thin gold foil and observed the following things:

  • Most of the alpha particles passed straight without any deflection
  • Few alpha particles got deflected from their paths on small angles
  • Very few alpha particles got deflected from their paths on very large angles

<h3>Results of the experiment:</h3>
  • Most of the space inside an atom is empty
  • The center of the atom is occupied by a tiny positively charged dense body called a nucleus. Most of the mass of the atom is concentrated in the nucleus
  • The electrons revolve around the nucleus in circular orbits and are called planetary electrons

Thus, the results of the experiment were surprising due to the above-stated facts.

Learn more about Rutherford's Gold Foil experiment:

brainly.com/question/4113533

#SPJ4

6 0
1 year ago
Equal masses of aluminum and copper are heated to 100 degree C and placed in water. Which would cause the water to reach the hig
Fittoniya [83]

Answer:

copper will reach to higher temperature first.

Explanation:

8 0
2 years ago
Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq). Calculate the a
ikadub [295]

Answer:

Mass gallium (Ga°(s)) produced ≅ 0.800 grams (1 sig. fig.)

Explanation:

Ga(OH)₃ => Ga⁺³ + 3OH⁻

Ga⁺³ + 3e⁻ => Ga°(s)

? grams Ga°(s) = 0.680 Amps x 1 mole e⁻/1 Faraday x 1 Faraday/96,500 Amp·sec x 1 mole Ga°/3 moles e⁻ x 69.723 grams Ga°/mole Ga° x 60 sec/1 min x 80 min = [(0.680)(69.723)(60)(80)/(96,500)(3)] grams Ga° = 0.786099731 grams Ga° (calc. ans.) ≅ 0.800 grams Ga°  (1 sig. fig.)

8 0
3 years ago
2. How much heat is needed to convert 2.7 moles of ethanol at its boiling
Shtirlitz [24]

Answer:

así que busca, pero la respuesta está en por cierto Explanation:

5 0
3 years ago
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