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
Scilla [17]
3 years ago
12

Consider two processes: sublimation of I2(s) and melting of I2(s) (Note: the latter process can occur at the same temperature bu

t somewhat higher pressure).
I2(s) → I2(g)
I2(s) → I2(l)
Is ΔS positive or negative in these processes?

Chemistry
2 answers:
AVprozaik [17]3 years ago
4 0

Answer:

positive

positive

Explanation:

Entropy -

In a system, the randomness is measured by the term entropy .

Randomness basically refers as a form of energy that can not be used for any work.

The change in entropy is given by amount heat per change in temperature.

  • When solid is converted to gas entropy increases,

As the molecules in solid state are tightly packed and has more force of attraction between the molecules, but as it is converted to gas, the force of attraction between the molecule decreases and hence entropy increases.

So,

The particles of the substance , if are tightly held by strong force of attraction will decrease the entropy ,

And

If the particles are loosely held , the entropy will increase , i.e. , positive entropy .

Similar with solid converting to liquid , the entropy will increases , i.e. , positive entropy .

Hence ,

The correct sign of entropy for both the process is positive .

ziro4ka [17]3 years ago
3 0

Answer:

ΔS increases in each case.  

Explanation:

Entropy (S) is a measure of the degree of the spreading of energy within a system. The more ways that energy can be distributed, the greater the entropy.

(a) Sublimation of I₂

I₂(s)⇌ I₂(g)

In the solid, the I₂ molecules are locked in position in a crystal lattice. They can vibrate only slightly about their equilibrium locations.  

Those in the gas phase can move in different directions and at different speeds, so the thermal energy is widely distributed among many microstates. The mobility of the molecules is greatly increased, so the number of number of microstates increases and entropy increases.

(b) Melting of I₂

I₂(s)⇌ I₂(ℓ)

The molecules in the solid can only vibrate about a fixed position.

Those in the liquid phase can move around and slide past each other. The increased freedom of motion means that thermal energy is distributed among more microstates, so the entropy increases.

You might be interested in
A forest area is being used for a new housing development. Most of the trees have been removed to make room for the
pantera1 [17]

Answer:

The correct answer would be - lose their native habitats are forced to migrate into new areas in search of shelter and food.

Explanation:

The removal of trees or deforestation to build a housing or city planning or development impact the birds and other animals of that area. Cutting most of the trees from the area will result in a decrease in available food, shelter, and breeding habitat.

It causes complete removal of bird species and forced them to migrate to a new place in search of places that will provide a source of shelter and food for birds.

7 0
2 years ago
What is the term for the amount of energy that is needed for a chemical reaction to occur?
cupoosta [38]
<span>This would be the activation energy. This is usually in the form of heat, which allows the reaction to undergo some sort of transition. Many times, enzymes can be used as catalysts to lower the activation energy required for the reaction to take place.</span>
3 0
3 years ago
What is the volume of a balloon if it contains 3.2 moles of helium at a temperature of 20. °C and standard pressure?
KatRina [158]

Answer:

1.14 mol

Explanation:

3 0
2 years ago
Determine the empirical formula. a 3.880g sample contains 0.691g of magnesium , 1.84 g of sulfur , and 1.365 g of oxygen .
Aliun [14]

Answer:

Mg S2 O3

Explanation:

.691 g of Mg  is .284 mole

1.84 g of S    is .5739 mole

1.365 g of O is  .8531 mole      you can see the ratio is ~  1 :2 :3

                                                        Mg S2 O3

4 0
2 years ago
How much energy is required to raise the temperature of a 300.0
Montano1993 [528]

Answer:

Q = 1455.12 Joules.

Explanation:

Given the following data;

Mass = 300 grams

Initial temperature = 22.3

Final temperature = 59.9°C

Specific heat capacity = 0.129 J/gºC.

To find the quantity of energy;

Q = mcdt

Where,

Q represents the heat capacity.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

dt represents the change in temperature.

dt = T2 - T1

dt = 59.9 - 22.3

dt = 37.6°C

Substituting the values into the equation, we have;

Q = 300*0.129*37.6

Q = 1455.12 Joules.

8 0
3 years ago
Other questions:
  • Which gas has a higher rate of effusion sulfur dioxide or oxygen? why?
    9·1 answer
  • For an exothermic reaction at equilibrium, how will increasing the temperature affect Keq?
    8·1 answer
  • Explain how the periodic table can help in writing electron configurations
    5·2 answers
  • The graph shows the volume of a gaseous product formed during two trials of a reaction. A different concentration of reactant wa
    10·1 answer
  • After doing multiple titrations, your NaOH solution is determined to have a mean concentration value of 0.100 M. Given you are t
    12·1 answer
  • In a chemical equation, which symbol should be used to indicate that a substance is in solution?
    14·2 answers
  • What type of solution would have a pOH of 7
    12·2 answers
  • How to tell the difference between a physical and chemical change
    13·1 answer
  • Calculate the molar mass of mgoh2
    15·1 answer
  • 25 Points! A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which tw
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!