Home
Class 12
BIOLOGY
Chemical reactions are invariably associ...

Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as
`{:(q = ms DeltaT,,s ="Specific heat"),(=cDeltaT,,c ="Heat capacity"):}`
Heat of reaction at constant volume is measured using bomb calorimeter.
`q_(V) = DeltaU =` Internal energy change
Heat of reaction at constant pressure is measured using simple or water calorimeter.
`q_(p) = DeltaH`
`q_(p) = q_(V) +P DeltaV`
`DeltaH = DeltaU +DeltanRT`
The heat capacity of a bomb calorimeter is `500 JK^(-1)`. When `0.1g` of methane was burnt in this calorimeter, the temperature rose by `2^(@)C`. The value of `DeltaU` per mole will be

A

Potometer

B

Dendometer

C

Porometer

D

Moll’s apparatus

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • TRANSPORT IN PLANTS

    AAKASH SERIES|Exercise EXERCISE III|20 Videos

  • TRANSPORT IN PLANTS

    AAKASH SERIES|Exercise EXERCISE III|20 Videos

  • RESPIRATION IN PLANTS

    AAKASH SERIES|Exercise Exercise - III|9 Videos

Similar Questions

Explore conceptually related problems

Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as {:(q = ms DeltaT,,s ="Specific heat"),(=cDeltaT,,c ="Heat capacity"):} Heat of reaction at constant volume is measured using bomb calorimeter. q_(V) = DeltaU = Internal energy change Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = DeltaH q_(p) = q_(V) +P DeltaV DeltaH = DeltaU +DeltanRT The enthalpy of fusion of ice is 6.02 kJ mol^(-1) . The heat capacity of water is 4.18 J g^(-1)C^(-1) . What is the smallest number of ice cubes at 0^(@)C , each containing one molw of water, the are needed to cool 500g of liquid water from 20^(@)C to 0^(@)C ?

Chemical reactions are invariably assocated with the transfer of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as: q= ms DeltaT , s= specific heat = c Delta T , c= heat capacity Heat of reaction at constant volume is measured using bomb calorimeter. qv= Delta U= internal energy change. Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = Delta H, q_(p) = q_(v) + P Delta V, DeltaH = DeltaU + Delta nRT The amount of energy released during a chemical change depnds on the physical state of reactants and products, the condition of pressure, temperature and volume at which the reaction is carried out. The variation of heat of reaction with temperature and pressure is given by Kirchhoff's equation: (DeltaH_(2)- DeltaH_(1))/(TT_(2)-T_(1)) = DeltaC_(P) (At constant pressure), (DeltaU_(2)- DeltaU_(1))/(TT_(2)-T_(1)) = DeltaC_(V) (At constant volume) The heat capacity of bomb calorimeter (with its contents) is 500J/K. When 0.1g of CH_(4) was burnt in this calorimeter the temperature rose by 2^(@)C . The value of DeltaU per mole will be

Chemical reactions are invariably associated with the transfer of energy either in the form of hear or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as: q= ms Delta T , s= Specific heat = c Delta T = Heat capacity. Heat of reaction at constant pressure is measured using simple or water calorimeter. Q_(v)= Delta U = Internal energy change, Q_(P) = DeltaH, Q_(P) = Q_(V) + P Delta V and DeltaH = Delta U+ Delta nRT . The amount of energy released during a chemical change depends on the physical state of reactants and products, the condition of pressure, temperature and volume at which the reaction is carried out. The variation of heat of reaction with temperature and pressure is given by Kirchoff's equation: (DeltaH_(2) - DeltaH_(1))/(T_(2)-T_(1))= Delta C_(P) (At constant pressure), (DeltaU_(2) - DeltaU_(1))/(T_(2)-T_(1)) = DeltaC_(V) (At constant volume) The specific heat of I_(2) in vapoour and solid state are 0.031 and 0.055 cal/g respectively. The heat of sublimation of iodine at 200^(@)C is 6.096 kcal mol^(-1) . The heat of sublimation of iodine at 250^(0)C will be

Chemical reactions are invariably associated with the transfer of energy either in the form of hear or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as: q= ms Delta T , s= Specific heat = c Delta T = Heat capacity. Heat of reaction at constant pressure is measured using simple or water calorimeter. Q_(v)= Delta U = Internal energy change, Q_(P) = DeltaH, Q_(P) = Q_(V) + P Delta V and DeltaH = Delta U+ Delta nRT . The amount of energy released during a chemical change depends on the physical state of reactants and products, the condition of pressure, temperature and volume at which the reaction is carried out. The variation of heat of reaction with temperature and pressure is given by Kirchoff's equation: (DeltaH_(2) - DeltaH_(1))/(T_(2)-T_(1))= Delta C_(P) (At constant pressure), (DeltaU_(2) - DeltaU_(1))/(T_(2)-T_(1)) = DeltaC_(V) (At constant volume) The enthalpy change (DeltaH) for the reaction N_(2) (g) + 3H_(2)(g) rarr 2NH_(3)(g) is -92.38kJ at 298 K. The internal energy change DeltaU at 298 K is

Explain the change of heat energy in a physical change.

Heat of reaction is defined as the amount of heat absorbed or evolved at a given temperaturewhen the reactants have combined to form the products is represented by a balanced chemcial equation. If the heat is denofed by q then the numerical value of q depends on the manner in which the reaction is performed for the two methods of conducting chemical reactions in calorimeters. Constant volume W = 0 and q_(v) = Delta E Bomb calorimeter Constant pressure W = - V Delta P, therefore q_(P) = Delta E + P Delta V rar (V. Delta P) The heat capacity of a bomb calorimeter is 300 JK When 0.16 gm of methane was burnt in this calorimeter the temperature rose by 3^(@) C. The value of Delta U per mole will be a. 100 KJ b. 90 KJ c. 900 KJ d. 48KJ

The specific heat of a gas in an isothermal process is

Chemical reactions in which heat energy is evolved are called

Chemical reactions in which heat is absorbed are called _________

How is the transference of heat energy by radiation prevented in a calorimeter ?

AAKASH SERIES-TRANSPORT IN PLANTS -EXERCISE II
  1. The cohesive force of water is due to :

    Text Solution

    |

  2. A higher plant cell covered with cutin and suberin is placed in water....

    Text Solution

    |

  3. Conduction of sap in plants occurs through:

    Text Solution

    |

  4. The blockage of one or two tracheary elements in a tree may cause

    Text Solution

    |

  5. This plant is ideal to demonstrate ascent of sap

    Text Solution

    |

  6. The term ‘tensile strength’ represents that there is

    Text Solution

    |

  7. In a branch cut from a rapidly transpiring plant, water snaps away fro...

    Text Solution

    |

  8. When an oak tree is kept in a poisonous solution, that rises to the to...

    Text Solution

    |

  9. Who among the following scientists first gave the starch sugar interco...

    Text Solution

    |

  10. Chemical reactions are invariably associated with the transfter of ene...

    Text Solution

    |

  11. A chemical widely used as antitranspirant

    Text Solution

    |

  12. Which of the following theory gives the latest explanation for the ope...

    Text Solution

    |

  13. Which one of following is not an antitranspirant?

    Text Solution

    |

  14. Which one of the following will not directly effect transpiration?

    Text Solution

    |

  15. When pheloem is removed by girdling

    Text Solution

    |

  16. Although a girdled (upto bast ) three may survive for sometime , but i...

    Text Solution

    |

  17. How does the removal of a ring of bark and wood from the trunk of a tr...

    Text Solution

    |

  18. When stem of plant is girdled (ringed) :

    Text Solution

    |

  19. Ringing (girdling) experiment cannot be performed in

    Text Solution

    |

  20. The protoplasmic streaming hypothesis for food translocation has not b...

    Text Solution

    |