1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zhenek [66]
2 years ago
10

1. Show that heat flows spontaneously from high temperature to low temperature in any isolated system (hint: use entropy change

that occurs during the process for your proof).
2. Work out the entropy change for the decomposition of mercuric oxide using mathematical and graphical arguments.
Chemistry
1 answer:
Inga [223]2 years ago
8 0

Answer:

1 ) Δs ( entropy change for hot block ) = - Q / th  ( -ve shows heat lost to cold block )

Δs ( entropy change for cold block ) = Q / tc

∴ Total Δs = ΔSc + ΔSh

                 = Q/tc - Q/th

2) ΔSdecomposition = Δh / Temp = ( 181.6 * 10^3 / 773 ) = 234.928 J/k

Explanation:

<u>1) To show that heat flows spontaneously from high temperature to low temperature </u>

example :

Pick two(2) solid metal blocks with varying temperatures ( i.e. one solid block is hot and the other solid block is cold )

Place both blocks for time (t ) in an insulated system to reduce heat loss or gain to or from the environment

Check the temperature of both blocks after time ( t ) it will be observed that both blocks will have same temperature after time t ( first law of thermodynamics )

Δs ( entropy change for hot block ) = - Q / th  ( -ve shows heat lost to cold block )

Δs ( entropy change for cold block ) = Q / tc

∴ Total Δs = ΔSc + ΔSh

                 = Q/tc - Q/th

<u>2) Entropy change for Decomposition of mercuric oxide </u>

2HgO (s) → 2Hg(l) + O₂ (g)

Δs = positive

there is transition from solid to liquid and the melting point of mercury ( the point at which reaction will take place ) = 500⁰C

hence ΔSdecomposition = S⁻ Hg  -  S⁻ HgO =

Δh of reaction = 181.6 KJ

Temp = 500 + 273 = 773 k

hence ΔSdecomposition = Δh / Temp = ( 181.6 * 10^3 / 773 ) = 234.928 J/k

You might be interested in
A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to v
k0ka [10]

Answer:

The scientist is observing an intensive property of a superconductor.

Explanation:

An intensive property is a bulk property of matter. This means that an intensive property does not depend on the amount of substance present in the material under study. Typical examples of intensive properties include; conductivity, resistivity, density, hardness, etc.

An extensive property is a property that depends on the amount of substance present in a sample. Extensive properties depend on the quantity of matter present in the sample under study. Examples of extensive properties include, mass and volume.

Resistance of a superconducting material has nothing to do with the amount of the material present hence it is an intensive property of the superconductor.

6 0
3 years ago
Read 2 more answers
What is the ground state shorthand notation for iron (Fe)?
mario62 [17]

Answer:For Fe

Z=26

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2 3d6

Are there 26 electrons here? Why should there be 26?

So going back to the inert gas, argon ( Z=18 ), we get

[Ar] 4s2 3d6


Make sure to check your work by counting the electrons you have

8 0
3 years ago
Write the trigonometric equation for the function with a period of 6. The function has a maximum of 3 at x = 2 and a low point o
White raven [17]

Answer:

Do you have a picture?

Explanation:

Sometimes, pictures are required to answer questions.

7 0
3 years ago
Is anyone good at chemistry if so can someone help me please ?
saveliy_v [14]

We're given the [OH⁻] as 8.34 × 10⁻¹² M. Using the formula pOH = -log[OH⁻], the pOH of this solution would be -log(8.34 × 10⁻¹²) ≈ 11.08.

The pOH is, for lack of a better term, the "opposite" of pH: A pOH of 7 is neutral; a pOH less than 7 is <em>basic</em>; and a pOH greater than 7 is <em>acidic</em>.

This follows from the relation, pH + pOH = 14. In this case, with a pOH of 11.08, our pH would be 14 - 11.08 = 2.92, which is acidic (pH < 7).

Thus, the correct answer choice is B.

4 0
3 years ago
Robert Hooke used a microscope to observe tiny spaces in
nordsb [41]

Explanation:

B. Plant cells is the correct answer

3 0
3 years ago
Read 2 more answers
Other questions:
  • Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.
    6·1 answer
  • As an object falls freely near the earths surface , the loss in gravitational potential energy of the object is equal to its wha
    8·2 answers
  • How many joules of heat are required to heat 125 g aluminum from 19.0°C to 95.5°C?
    13·2 answers
  • The source of the sun's heat is A. nuclear fission. B. nuclear fusion. C. nuclear disintegration. D. nuclear separation
    5·2 answers
  • Aluminum chloride is added to cesium does a single replacement reaction occur, and if so what is the correct chemical equation f
    15·2 answers
  • Select the correct value for the indicated bond angle in each of the following compounds: O-S-O angle of SO2 F-B-F angle of BF3
    12·1 answer
  • What is the vapor pressure of water at 105 degree Celsius?
    5·1 answer
  • No link just right answer
    9·1 answer
  • 100 PTS+BRAINILIEST: Why does it get colder as you go higher through the atmosphere, if you are getting closer to the sun??
    9·2 answers
  • 2. Calculate the atomic mass of the following elements i. Silicon ii. Magnesium iii. Potassium.​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!