Thermochemistry and Energetics of Chemical Reactions

The amount of heat absorbed by one mole of solid at 1 atm when it melts into liquid form is denoted by _ .

The heat of hydration decreases with the increase in:

Which of the following formations is an endothermic reaction?

Which of the following is an exothermic reaction?

The standard enthalpy of solution of NH₄Cl is _ kJmol^-1.

When one mole of gaseous hydrogen ions are dissolved in water to form an infinitely dilute solution, the amount of heat liberated is:

Standard enthalpy of combustion of graphite at 25 °C is –393.51 kJ mol^-1 and that of diamond is –395.41 kJ mol^-1. The enthalpy change for graphite is:

Which enthalpy change is relevant in the following process Na_(s) → Na _(g) ΔH = +107

Which of the equations shows ‘twice’ the enthalpy change of neutralization as the following equation: HCl + NaOH → NaCl + H₂O

Majority of reactions taking place at ordinary temperatures with H are:

If 100 kJ of heat is absorbed by the system and 40 kJ of work is done on the system what is the change of internal energy?

Identify standard enthalpy of reaction for the following reaction:

The equation Mg²⁺_(g) + O²⁻_(g) → MgO_(s) represents which energy change?

Which is correct for 1st law of thermodynamics?

Combustion of graphite to form CO₂ can be done by two ways: C + O₂ → CO₂, ΔH = -393.7 kJ mol⁻¹;

C + ½O₂ → CO, ΔH₁ =?;

CO + ½O₂ → CO₂.

What is ΔH₁?

Which enthalpy change is relevant in the following process? Na_(s) → Na_(g), ΔH = +108 kJ mol⁻¹

Heat of formation (ΔH°_f) for CO₂ is:

Which of the following enthalpies of formation cannot be measured directly?

In order to determine ΔH_(lattice) of ionic compound which is correct relationship?

Which one of the following equations shows standard enthalpy of combustion?

Which of the following enthalpy change may have positive or negative value?

Which one of the following has standard enthalpy of formation equal to zero?

Which one of the following has non-zero enthalpy?

Conversion of sodium into sodium ions is:

Lattice energy of an ionic crystal is the enthalpy of:

Hydrogen is a diatomic molecule and its molecule have

Which of the following sets constitutes all the state functions of a system?

The change in enthalpy for the reaction: NaOH_(aq)​+HNO_3(aq)​→NaNO_3(aq)​+H₂​O_(l)​ is

Units of change in enthalpy of a system are

5 calories are equivalent to _ Joule.

The sign of heat "q" is positive for a system when:

Which of the following food product has lower energy per gram?

The heat of sublimation of potassium is 98kJ/mol. The heat of dissociation of bromine gas is 192.5 kJ/mol. The ionization energy of K is 414 kJ/mol. The electron affinity of Br -334.7kJ/mol and the heat of formation of KBr is -405.8 kJ/mol. Calculate the lattice energy of KBr

ΔH can be measured indirectly by applying

One slice of bread with a tablespoon of peanut butter on it contains 20g carbohydrate, 10g protein,and 9g fat. Calculate total energy consumed in this intake

When 1 mole of ice melts at 0° and constant pressure of 1 atmosphere, 6025 J of heat is absorbed by the system. The molar volume of ice and water are 0.020and 0.018 dm³, respectively. Calculate ΔE.(1dm3.atm=101.33J)

calculate the work done when 1 mole of an ideal gas expands from 15 dm³ to 20 dm³ against a constant external pressure of 2 atmospheres

Who stated that enthalpy change in a chemical reaction is same whether the reaction takes place in single step or in several steps?

What will be formula of work, when work is done on the system by the surrounding?

What will be the internal energy of a system at constant volume?

At constant volume, the heat supplied to a system is always equal to its

The enthalpy change when 1 Mole of water is formed by the reaction of acid with an alkali under standard conditions is known as:

All of the following steps are used to calculate the lattice energy in the Born-Haber cycle EXCEPT:

In endothermic reaction,the heat content of the:

An example of an endothermic reaction is:

Volume is a:

Born-Haber's cycle enables us to calculate:

The correct equation for the first law of thermodynamic is:

High pressure of 200 atm in Haber process is used for:

The sum of all the energies of all the molecules or atoms of a substance is called its?

A system that can exchange or transfer both energy and matter with the surroundings is:

Freon is commonly known as?

Which of the following term is state function?

Born-Haber cycle is used to determine the Lattice energy of Ionic compounds. It Is the application of

If we want to raise the temperature of one mole of an ideal gas by one kelvin we have to provide how much amount of energy?

Exothermic reaction, by decreasing the temperature, equilibrium constant:

Reaction taking place in one step or in several steps have same ΔH. it is:

Reaction H₂ + Cl₂ 2HCl is:

The equation of the first law of thermodynamics q=AE+W, will reduce at constant volume to:

Which of the following is not an endothermic reaction?

Hess's law states the same thing as

Thermodynamically, the most stable form of carbon is:

Amount of heat absorbed, when one mole of liquid changes to gas at its boiling point is called:

For an endothermic reaction, H represents the enthalpy of reaction. The minimum value for the energy for activation will?

If the work is done by the system on the surroundings and heat is absorbed by the system from the surroundings the change in internal energy E will be

The specific heat of water is.

SI Unit of specific heat capacity is:

What is the unit of heat capacity?

The process of heat flow between hotter and colder gases remains continued until all the molecules have equal:

For exothermic reactions AH°i s written as:

Which of the following is not true for increase in synthesis of ammonia by Haber's process?N₂ +3H₂ - 2NH₃ ( Д =-92.5)

What Is ∆H equal to according to the first law of thermodynamics?

What is the mathematical statement of the first law of thermodynamics?

Born Haber cycle is used to determine:

The heat of combustion of hydrocarbon is very useful source of heat and power, considering the combustion reaction given below. CH_4(g) +O_2(g) →CO_2(o) + 2H₂O △H for the reaction is:

The amount of energy required to break one mole of a particular type of bond is equal to its:

Which one of the following is the correct demonstration of first law of thermodynamics?

ΔH = ΔE+PΔV is the change in enthalpy at constant_.

The compound with most exothermic lattice energy is:

The bond energy of (H₂ )molecule (H₂→2H) is:

The process that can be both endothermic and exothermic out of the following is:

Students were decomposing 𝐶𝑎𝐶𝑂₃ placed in a China dish by heating using burner in the laboratory. The "system" in this experiment is:

Addition of soluble impurities into a liquid and solid respectively causes:

During the formation of aqueous solution of any electrolyte:

Enthalpy is measured at _:

Determine the value of Enthalpy of formation of NH₄Cl.

Mg + 1/2 O_2(g) → MgO_(g) H=-692 kJmol^-1 at STP. The enthalpy of the above reaction will be called:

½ H_2(g) → H_(g) ΔH = 218 kJmol^-1 In this reaction, ΔH will be called:

Reactants have high energy than products in:

Heat of formation (∆Hf°) for CO₂ is:

Combustion of graphite to form CO₂ can be done by two ways. Reactions are given as follows: 1.C + O₂ CO₂ ∆H = -393.7 kJ mol^-12.C + ½O₂ CO ∆H = ?3.CO + ½O₂ CO₂ ∆H = -283 kJ mol^-1What will be the enthalpy of the formation of CO?

What will be the enthalpy change in the reaction given below?2H₂ + O₂→ 2H₂O ∆H = +205.5 kJ mol^-1

In Standard Enthalpy of Atomization, heat of the surrounding:

The lattice energy of an ionic crystal is the enthalpy of:

'∆H' will be given a negative sign in:

Standard enthalpy of combustion of graphite at 25 °C is -393.51 kJ mol^-1 and that of diamond is -395.41 kJ mol^-1. The enthalpy change for graphite is:

The equation that represents standard enthalpy of atomization of hydrogen is:

The heat capacity ratio of a monoatomic gas is:

A gas mixture contains 2 moles of Oxygen and 4 moles of Argon at temperature T. Neglecting all vibrational moles, the total internal energy of the system is:

The evaporation of water is an example of?

What is the enthalpy of solution of NH₄Cl?

In the enthalpy relation, Δ H = (q)p + Δ (PV), the value Δ (PV) can be neglected for the reactions involving?

The enthalpy change of a reaction which involves the formation of the compound from its elements at S.T.P. is called?

Heat absorbed by a substance at constant pressure is equal to _?

Which of the following is not a state function?

Enthalpy of a system is given as _?

Law of conservation of energy is actually:

Heat is the energy that flows across the:

Enthalpy of a system is also called as _?

Heat exchanged between the system and surrounding at constant volume is shown by the relation:

What is the correct equation to find heat of neutralization using glass calorimeter?

The statement: energy of system and surrounding is conserved, is related to which law of thermodynamic?

The SI unit for work is _.

Which one of the following is not the property of a system?

For the reaction: 1/2 H₂ → H , the change in enthalpy is called _.

If energy of reactants is less than that of products then during the reaction _.

The SI unit for energy change in a chemical reaction is:

In Chemistry, the work is generally:

Enthalpy change of solution of Na₂CO₃ is a _ reaction?

Energy changes in cyclic process is always:

Knowledge obtained through thermodynamics is used to explain which of the following property?

Which of these have a positive value of enthalpy?

For a reaction that can takes place in more than one ways, the enthalpy of that reaction is _?

Hess's law states that the total enthalpy change of a reaction remains same regardless of:

Production of Ammonia by Haber's process is a _.

The reactions that release heat are called as _.

dH and dE have same values for the reaction in _?

State functions are independent of:

Temperature of the surrounding falls during?

The condition of a system is called as _.

The sum of potential and kinetic energy of a system is called _.

For the reaction: NaOH + HCI ➔ NaCl + H₂₀ the change in enthalpy is called as _ ?

Which of the following law explains that net heat change in a reaction is same whether it takes place through two or more different ways?

Joule is the unit of ?

Which one of the following is not an example of state function?

The reactions that need energy are called _.

Chemical reactions involve a change in heat energy and the study is called?

Which of the following process is an example of exothermic reaction?

A piston in a cylinder is a part of?

The value of heat of neutralization of strong acid with a strong base is always _.

A state function is the _ property of the system.

What will be the value of work done at constant pressure in a pressure volume system?

Falling water of a waterfall is an example of:

A strong acid can be involved in a spontaneous reaction which is termed as:

A state function depends upon the _.

The heat of combustion is always a _.

The heat of solution for NaCl is?

The kinetic energy of the molecule may be all of the following except?

The only thing which can predict that if the reaction will be spontaneous or nonspontaneous is:

Kinetic energy is the sum of:

What pressure of oxygen is maintained inside the bomb calorimeter?

The First Law of thermodynamics is _.

Which one of the following is the correct value for the enthalpy of formation of CO?

The property of the system which does not depend upon the path followed by the system is called as?

In thermodynamic terms, the boundary separates the?

Conversion of water into steam is a?

At which of the following temperature standard enthalpies are measured?

When does it mean, when a reaction is exothermic?

The Boltzmann's constant, kB, is defined as:

What is the value of enthalpy of neutralization when one mole of base reacts with one mole of acid?

The total of all the possible kind of energies in a system is called:

The imaginary surface separating system and surroundings is called _?

The calorific value of H_2(g) at STP is 12.78 KJ/L. Hence, the approximate standard enthalpy of formation of H₂O is:

For the water gas reaction C _(s) + H₂O _(g) CO _(g) + H_{2 (g)}At 1000 K the standard Gibbs free energy change of the reaction is - 8.314 kJ/mol. Therefore at 1000 K the equilibrium constant of the above water gas reaction is:

Change in volume of a system depends only upon:

Enthalpy is the sum of internal energy and:

Energy in the formation of a crystal lattice is _.

Bond energy is also called bond enthalpy that is the measure of enthalpy change at:

Which one has greater hydration energy?

Which of the following has the highest heat of vaporization?

Energy for endothermic reaction comes from:

Steam causes more severe burns than boiling water because it has _.

Which one of the following is a state function that describe both the internal energy and product of pressure and volume?

ΔHf of which of the following cannot be measured directly?

How can enthalpy changes of reactions be measured?

On which of the following factors Hydration Energy depends?

Evaporation is a _ process.

Temperature and volume in an experiment are part of?

Heat supplied at constant pressure equals to:

If water is present in a cup placed on a table, what will be the system in this case?

A gas expands from V₁ to V₂ at pressure P. Work done is:

Which of this is constant in isochoric process?

Formation of carbon dioxide hinders in calculating the heat of formation of:

Which of the following condition is constant in Bomb calorimeter?

Which ion will have a maximum value of the heat of hydration?

Energy for the endothermic reaction is given a _ value?

The given diagram shows the enthalpy changes during a chemical reaction. What type of reaction is this?

Lattice Energy of ionic compounds are found by:

Through what phenomenons does heat flow?

Anything under test or observation in laboratory is called

In exothermic reactions, heat is:

If a graph is plotted between pressure on x- axis and volume on y- axis for Boyle's law verification, the curve obtained is called

If pressure and volume of a gas are variable while temperature remains constant, this belongs to

Work done on the system is

A catalyst increases the rate of reaction by:

The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps. This is known as:

Given the bond energy N ≡ N, N - H and H - H bonds are 945, 391, and 436 kJmol^-1 respectively, the enthalpy of the reaction N_2(g) + 3H_2(g) 2NH_3(g) is;

Which one of the following equations correctly defines the enthalpy changes of formation of carbon monoxide:

Two rocket fuels below are determined by their high performance.N₂H_4(l) + O_2(g) N_2(g) + 2H₂O_(l) ΔH= -632 kJH_{2 (g)} + ½ O_2(g) H₂O_(l) ΔH = -286 kJIf equal masses of hydrazine and hydrogen are used, which of the following has better performance?

Starting point of Kelvin scale is:

Some substances lack definite heats of fusion. These substances are:

Molar heat of vaporization is the amount of heat required to convert one mole of:

For a chemical reaction A + B, the threshold energy of the reaction is 31 KJ.mole. The average internal energy of A is 12 KJ/mole. What will be the activation energy of A?

For a reaction given below C_(s) + O_{2 (g)} CO_{2 (g)} -394 kJ / molThe enthalpy of reaction is

Heat evolved or absorbed in a chemical reaction does not depend upon?

The enthalpy of certain reactions at 273 K is -20.75 kJ. The enthalpy of the same reaction at 373 K (if heat capacities of reactants and products are the same) will be:

Which of the following values of heat of formation indicates that the product is least stable?

One Calorie is equal to:

The thermal energy at constant pressure is called:

The reaction 2CO + O₂ 2CO₂ proceeds slower because activation energy is:

In those reactions where determination of enthalpy value is difficult by experiments, in such cases enthalpy value can be calculated by:

Which of the following statements is NOT true for the first law of thermodynamics?

Cl + e ----> Cl-ΔH = -348kJ/molThe value -348KJ/mol in this case will be:

The study of measurement of heat absorbed or given out in a chemical reaction is referred to as:

Standard heat enthalpy of a compound is equal to its:

In an adiabatic process:

The heat of a reaction can be calculated by using:

The enthalpy change accompanying the gain of an electron by a neutral gaseous atom to form a negative ion is called:

The change in heat energy in a chemical reaction at constant temperature and pressure is called:

Reaction of water with quicklime results in the rise in the temperature of the system. Using the concept of an energy change, indicates the nature of the reaction?

Transfer of heat from cold to hot place in refrigerator mechanism is an example of:

When two moles of H₂ and one mole of O₂ react to form H₂O, -484 KJ heat is evolved. What is Δ Hf for one mole of H₂O?

Thermochemistry is very important to learn about _.

Which of the following are the fundamental ways of transferring energy?