Chemistry questions
29404 published questions with worked solutions.
- Conversion of oxygen to ozone represented by the equation 3O_2 2O_3 is an endothermic reaction. Enthalpy change H accompanying...
- Enthalpy change for reaction, 1 2 H_2 + 1 2 Cl_2 HCl , is called __________
- The enthalpy of formation of ammonia gas at 298 K is -46.11 kJ ,mole^ -1 . The equation for which this value relates is __________
- Bond dissociation energy of O_ 2(g) is x kJ ,mol^ -1 . This means that __________
- The heat of a chemical reaction is given by the following expression, __________
- The enthalpy change for the formation of 3.6 kg of water is __________ H_ 2(g) + 1 2 O_ 2(g) H_2O_ (l) ; H = -284.5 kJ ,mol^ -1
- The enthalpy change when one gram equivalent of an acid is exactly neutralized by one gram equivalent of a base in its dilute...
- An exothermic reaction is one in which the reacting substances __________
- If the enthalpy of B is greater than of A, the reaction A B is __________
- Study the following two reactions: (i) CH_ 4(g) + 2O_ 2(g) CO_ 2(g) + 2H_2O_ (g) ; H = -890.4 kJ (ii) 2HgO_ (s) 2Hg_ (l) + O_...
- A chemical reaction in which heat is absorbed from the surroundings with increase in enthalpy is called __________
- Given the following information (i) A + B C + D; H = -10.0 kcal (ii) C + D E; H = 15.0 kcal Then, H for A + B E will be __________
- The free energy change for a reversible reaction at equilibrium is __________
- The total entropy change for a system and its surroundings increases, if the process is __________
- Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64 kJ ,mol^ -1 and -145.6 J ,K^ -1...
- At 300 K, the reaction with which of the following values of thermodynamics parameters occur non-spontaneously?
- Entropy is maximum in case of __________
- The standard Gibbs free energy change G^ is related to equilibrium constant K_p as __________
- Spontaneity of a chemical reaction is decided by the negative change in __________
- A minus sign of the free energy change denotes that __________