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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 5-States of Matter: Gases and Liquids CBSE/Class 11/Science/Chemistry

Nasrin S.

Pressure is directly proportional to temperature. As the temperature increases in summer, the pressure of the gas inside the bottle will increase. Morover the solubility of the dissolved gas decreases with increase in temperature. To avoid the bottles bursting open as a result of increase in pressure,... read more

Pressure is directly proportional to temperature. As the temperature increases in summer, the pressure of the gas inside the bottle will increase. Morover the solubility of the dissolved gas decreases with increase in temperature. To avoid the bottles bursting open as a result of increase in pressure, they are kept in water. Water absorbs heat more slowly due to its higher latent heat of vapourisation.

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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

The enthalpies of all elements in their standard states are : ‘ (i) unity (ii) zero (iii) <... read more
The enthalpies of all elements in their standard states are : ‘
(i) unity (ii) zero
(iii) < 0 (iv) different for each element read less

Meenakshi M.

Zero
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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

In a process, 701 ] of heat is absorbed by a system and 394 J of work is done by the system. What is... read more
In a process, 701 ] of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process? read less

Reman Kumar Singh

Tutor

use the first law of thermodynamics dU = dQ + dW dU = 701 - 394 dU = 307 J Notes : the system is doing work thats why work done is negative, whereas heat is going in to the system therfore the it is positive.
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Answered 6 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

Enthalpy of combustion of carbon to carbon dioxide is – 393.5 J mol-1 .Calculate the heat released... read more
Enthalpy of combustion of carbon to carbon dioxide is – 393.5 J mol-1   .Calculate the heat released upon formation of 35.2 g of C0from carbon and oxygen gas. read less

Deepak K.

Moles of CO2 produced during combustion of 35.2g carbon = 35.2/44--> 0.8mole Enthalpy of combustion for 1 mole = -393.5kj Enthalpy of combustion for 0.8 mole=0.8*-393.5--> 314.8 KJ read more

Moles of CO2 produced during combustion of 35.2g carbon = 35.2/44--> 0.8mole

Enthalpy of combustion for 1 mole = -393.5kj

Enthalpy of combustion for 0.8 mole=0.8*-393.5--> 314.8 KJ

                                  

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Answered 6 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

If รข??U = 0 how are q and w related to each other?

Chirag P.

Tutor

If there is no accumulation of internal energy in the system, then work is equivalent to heat transfer. However, there is an assumption of no energy losses in the system and all the processes are assumed to be isentropic.
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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

When is bond energy equal to bond dissociation energy ?

Reman Kumar Singh

Tutor

For diatomic molecules like H2, O2 N2 etc, the bond energy is equal to the dissociation energy, because these molecule has only bond no other things like angle, dihedral etc. For example in H2O molecule along with bond between H-O, there is a angle also between H-O-H which also contribute in the dissociation... read more

For diatomic molecules like H2, O2 N2 etc, the bond energy is equal to the dissociation energy, because these molecule has only bond no other things like angle, dihedral etc. For example in H2O molecule along with bond between H-O, there is a angle also between H-O-H which also contribute in the dissociation energy, and that is the reason why the bond energy cant be same as dissociation energy in multiatomic molecule. 

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Answered 6 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

State Hess’s law.

Ashokan P

Happy

Hess' law of constant heat summation, also known as Hess' law
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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

What do you mean by entropy?

Chirag P.

Tutor

Entropy is a measure of disorder, or the energy loss in a process during its state changes in irreversible manner. A simple example of the entropy can be understood in the following way. consider a non reversible process which can happen in many ways, e.g. Expanding a gas in cylinder from high pressure... read more

Entropy is a measure of disorder, or the energy loss in a process during its state changes in irreversible manner. A simple example of the entropy can be understood in the following way.

consider a non reversible process which can happen in many ways, e.g. Expanding a gas in cylinder from high pressure to low pressure. It is understood that this can happen in plenty of way by extracting a work from system. If we allow a sudden expansion of the gas, it will generate high entropy, however if we expand the gas with slow pressure changes then the entropy generated is less. In general an entropy can be considered as the degradation of the energy when high quality energy (mechanical) is converted in to low quality energy (heat) 

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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

What is an adiabatic process?

Reman Kumar Singh

Tutor

In adiabatic process the change in heat is zero, means there is no transfer of heat bertween system and surrounding. dQ = 0
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Answered 5 days ago CBSE/Class 11/Science/Chemistry/Unit 6-Chemical Thermodynamics CBSE/Class 11/Science/Chemistry

What is free energy in terms of thermodynamics?

Reman Kumar Singh

Tutor

Free energy is amount of enegy have to the system for the reaction. Its changes will tell the direction and sponteneity of the reaction. If the change in free energy is positive for and process, the reaction or process will never occure. whereas, if is negative the reaction or process will happend sponneously... read more

Free energy is amount of enegy have to the system for the reaction. Its changes will tell the direction and sponteneity of the reaction. If the change in free energy is positive for and process, the reaction or process will never occure. whereas, if is negative the reaction or process will happend sponneously ( means withou effort) 

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