Chemistry, 29.07.2019 07:10 francisco42002

What would cause entropy to decrease in a reaction

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Answer from: Gunn2368

The decrease in entropy is caused when the product of a reaction has lesser disorder than that of reactant.

Explanation:

As we know that the entropy is the measure of system's disorder, the entropy in solid is less than that of liquid and gases. Gases have highest entropy. The thermodynamics, the second law is based on entropy which defines that in spontaneous reaction, there is always increase in the entropy.

If the reactants are undergoing a chemical reaction to produce a product that has lesser disorder, then there is decrease in entropy. For example, if two gases react to form a solid, then there will be decrease in entropy.

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

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