Which has the sign for the enthalpy change different to the other three?

Q: Use Hess’s law to determine anunknown heat of reaction.

A: How we can determine an unknown heat of reaction using Hess's law has to be given,

Q: What is the sign of ΔH for an exothermic reaction?An endothermic reaction?

A: The sign of ΔH for an exothermic reaction or an endothermic reaction has to be given below.

Q: 5.60 How are the standard enthalpies of an element and of a compound determined?

A: The standard enthalpies of an element and of a compound have to be determined.

Q: which version of the specific heat equation is both correct and is set up to solve for specific heat…

A: Specific heat capacity is the energy required to increase the temperature of one kg of a substance…

Q: what is the heat evolved

A:

Q: An automobile engine provides 623 Joules of work to push the pistons. In this process the internal…

A: Given: Work done = 623 Joules Change in internal energy = -2731 Joules

Q: find the change in enthalpy for the imaginary reaction below. given the following imaginary…

A: Hess law: ∆H= ∆H1+∆H2 +∆H3 If any thermochemical equation is reversed, then magnitude of energy…

Q: hich of the following is an example of an endothermic process?

A: Exothermic reaction are those in which energy is released and endothermic reaction are those in…

Q: A chemical reaction shifts left upon heating. What does that tell you about the enthalpy of…

A: If reaction is endothermic heat is required to form product and reaction is written as Reactant +…

Q: If 240 kJ of heat is required at constant pressure to decompose 2.0 mol of a substances to form its…

A: Standard Enthalpy of formation(∆Hfº): The standard enthalpy of formation is defined as the energy…

Q: e net change in enthalpy for

A:

Q: Using the Table of Thermodynamic Values, determine the change in enthalpy

A:

Q: The addition of 1.210 g of zinc metal to 0.100 L of 0.1851 M HCl in a coffee cup calorimeter causes…

A: In any particular reaction, enthalpy change that causes at pressure constant condition is considered…

Q: Which of the following characterizes an endothermic process in the styrofoam calorimetry experiment?…

A: The energy difference between the products and reactants is known as the energy change of a…

Q: When a gas is compressed, 462 J of work is performed and 128 J of heat is transferred to the…

A: Answer  When the gas is compressed, energy is transferred to the…

Q: You assumed the inital temperature of the metal was the same as that of the boiling water. If the…

A: the initial temperature of the metal was the same as that of the boiling water. If the metal sample…

Q: Draw an enthalpy diagram for a general exothermic reaction; label the axis, reactants, products, and…

A:

Q: Discuss the definition of the terms exothermic and endothermic. Give an example of an thermochemical…

A: The exothermic reaction is the reaction that releases heat. The heat of the reactant is higher than…

Q: The enthalpy change for heating a one mole sample of an ideal, monoatomic gas at 25°C is 3.75…

A: Enthalpy is the heat content of a system. The enthalpy change of a reaction is roughly equivalent to…

Q: if the standard heat for hydrogen (H2) is 0, what is the ammount of energy required or released in…

A: Heat of reaction is defined as the heat required or released during a chemical reaction. According…

Q: References Use the References to access important values if needed for this question. A chemical…

A: Answer is. 232joul

Q: the _____ of a reaction is the enthalpy change when all reactants and products are at 1 atm pressure…

A: Enthalpy H is the amount energy absorbed or released in a process.

Q: If the sign of AT is negative, is a substance gaining or loosing heat? Explain. How much heat is…

A: According to the law of calorimetry, Heat absorbed by a system = heat released by the system.

Q: 150 joules of heat was absorbed by the surounding as 150 joules of work was done by the system.…

A: Given, heat is absorbed by the surrounding 150 Jules

Q: enthalpy change for

A:

Q: When 0.5 mol of H2 is reacted with 0.5 mol of O2, 121 kJ of heat is released. Determine ΔHrxn for…

A: Given:  Moles of H2 =0.5  Moles of Cl2 = 0.5  Heat released = 121 KJ

Q: Which statement is false The thermodynamic quantity most easily measured in a "coffee cup"…

A: The statement which is false given below.

Q: Which of the following is not a state function?

A: State Function:- Thermodynamic function of properties which depends upon the initial and final state…

Q: Calculate ΔE of a gas for a process in which the gas evolves 8 J of heat and does 16 J of work by…

A: According to first law of thermodynamics: ∆E=q+w ......(1) Here, ΔE is the change in internal…

Q: Two metals of equal amount but with different heat capacities to the same amount of applied heat.…

A: As we know that -  Q = m.c.∆T  Smallest change in temperature will be when c has very high value. So…

Q: Cite an analogy that best interpret ENTHALPY

A: ANSWER IS

Q: of enthalpy

A:

Q: Enthalpy changes depend on the temperature and pressure under which a process occurs. However, the…

A: Standard state :-  Standard state for elements or compounds is the reference state at which…

Q: ? Zn(Hg), HCI AICI3, heat heat

A: Let us note some points t-butyl is a large group and thus the major product will be para product…

Q: NaOH N: КОН H,O, heat D,0 NEt,, heat

A:

Q: Use the data in the following image to answer this question. a.The reaction involved the…

A: Given: HCl is the limiting reagent. Moles of HCl =0.0600 mol ΔT =4.75oC Heat capacity = 3.97 J/g…

Q: at A sample of metal was placed in a test tube and then in a boiling water barh fon os l A samnen 5…

A:

Q: an a. Aluminum (specific heat capacity of 0.921 J/g°C) b. Copper (specific heat capacity of 0.377…

A:

Q: What is the standard enthalpy of formation for a compound? For a pure element in its standard state?

A: Standard enthalpy of formation of a compound is equal to the change in the enthalpy during the…

Q: The following thermochemical equation is for the reaction of water(1) to form hydrogen(g) and oxy…

A: Energy plays a key role in chemical processes. According to the modern view of chemical reactions,…

Q: 1. Calcium carbonate decomposes at high temperatures to form carbon dioxide and calcium oxide: Given…

A: We have given that  Calcium carbonate decomposes at high temperatures to form carbon dioxide and…

Q: When the sign of an energy change is being determined, this would always be with respect to what?

A:

Q: Using Hess’s Law, calculate for the change in enthalpy

A: From the Hess's law, According to this law, Enthalpy of a reaction remains constant whether it…

Q: Which of the following statements is CORRECT? a. Heat exchange is positive for an exothermic…

A: In exothermic reaction, product is more stable than reactant where in endothermic reaction, reactant…

Q: Calculate ΔU of a gas for a process in which the gas absorbs 41 J of heat and does 8 J of work by…

A: The change in internal energy of a system is denoted by ∆U. Heat absorbed by the system is denoted…

Q: When a system __________, ΔH is always positive. Group of answer choices gives off heat abosrbs heat…

A: ∆H will always positive if a system absorbs heat. It is independent of work.

Q: What does a high calorimeter constant indicate? What happens to the calorimeter constant if there is…

A: The "calorimeter constant" is just the specific heat of the calorimeter and its thermal…

Q: calculate heatE of a gas for a process in which the gas absorbs 25J of heat and does 7J of work by…

A: Consider the given information is as follows; Heat (q) = +25 J Work done by the system in expanding…

Q: Why the heat capacity of the calorimeter is an important number to determine?

A: Calorimeters are commonly used instruments for the measurement of enthalpy change of reactions. On…

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.