You may have noticed that when you compress the air in a bicycle pump, the body of the pump gets warmer. Assuming the pump and the air in it comprise the system, what is the sign of w when you compress the air? What is the sign of q for this process? Based on your answers to parts a and b, can you determine the sign for []E for compressing the air in the pump? If not, what would you expect for the sign of []E? What is your reasoning?

Q: A chemical reaction is run in which 138 Joules of work is done by the system and the internal energy…

A: Work done by the system is negative. So we use W= -138 J  Given: w= - 138J              ∆u= + 14J To…

Q: What are the signs for q and w to represent a system that's doing work on the surroundings, and…

A: “The relationship between heat with other forms of energy like light, mechanical work is studied…

Q: When 2.26 g of a salt dissolves in 121 mL of water (density = 1.00 g/mL) in a coffee-cup…

A: heat  capacity is defined as amount of energy needed to raise unit temperature of an object.

Q: Methane, CH4(g) obtained from natural gas is used as a fuel in lighters. The standard molar enthalpy…

A: Given: Heat of combustion of methane is -2000 KJ/mol.

Q: which of the following signs on q and w represent a system that is doing work on the surroundings…

A: Given :-  System is doing work on surrounding  System is gaining heat from surrounding  To…

Q: A battery harnesses a chemical reaction to extract energy in the form of useful electrical work. (a)…

A:

Q: f 112g of water at 54oC is mixed in a calorimeter with a 95g sample iron at 139oC, what is the final…

A: Given data: Mass of water(m1) = 112 gms       Its temperature(T1) = 54°C Mass of iron(m2) = 95 gms…

Q: A gas is warmed and gains 48J of heat. The gas expands as it is heated and work is done by the…

A: Answer : We have to calculate energy ,work and heat . Explanation :   Since gas is warmed so system…

Q: Butane, C4H10, is widely used as a fuel for disposable lighters. When one mole of butane is burned…

A:

Q: air in an infiated balloon in car on hot summer day absorbs As it expands, it does 2. of work. First…

A: Given work done is 77KJ

Q: What is the change in internal energy for each of the following situations? q = 7.9 J out of the…

A: The first law of thermodynamics says that total energy of the universe remains constant. Energy is…

Q: You may have noticed that when you compress the air ina bicycle pump, the body of the pump gets…

A: Work is done on the system by the surroundings when the air is compressed in bicycle pump.…

Q: Which of the following signs on q and w represent a system that is doing work on the surroundings,…

A:

Q: The change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is…

A: since, p is constant, q = delta H

Q: Two aircraft rivets, one iron and the other copper, are placed in a calorimeter that has an initial…

A: Given: Initial Temperature=20°C

Q: which of the following signs on q and w represent a system that is having work done on it by the…

A: • Sign Convention for Work, w i) w is positive, when work is done on the system by the surroundings…

Q: 3) A system moves from state A to state B. When the system takes path 1, 500 Jof heat flow into the…

A: Since you have posted multiple questions, we are entitled to answer the first only.

Q: CJ the ChemCat (#instainfamous) is at it again. In typical cat fashion, she resorts to knocking over…

A: The relation between the heat transferred (Q), mass of the substance (m), specific heat capacity ‘c’…

Q: Why not all endothermic processes that do work on the surroundings have the same sign for internal…

A: Endothermic processes are the processes which absorb heat energy from the surroundings. These…

Q: Gaseous SO2Cl2 reacts with liquid water to form hydrogen chloride gas and liquid sulfuric acid.…

A: Given: Gaseous SO2Cl2 reacts with liquid water to form hydrogen chloride gas and liquid sulfuric…

Q: Why are work, w, and heat, q, not state functions?

A: State function only depends on the final system and on the initial system, it does not depend how we…

Q: A certain closed system absorbs 150 J of heat and does 210 J of work. Which of the following about…

A: Given: Work done by the system = 210 J And heat absorbed by the system = 150 J

Q: enthalpy a state function. Fill in the blank: 4. For a change that takes place at constant pressure,…

A:

Q: Which condition results to work done greater than the change in internal energy? AU > 0; AS > 0 Ο Δυ…

A: Here we have to verify options and check by the help of first law of thermodynamics.

Q: Suppose we have a closed, un-isolated system. When 483 J of heat was introduced to the system, it…

A: According to the first law of thermodynamics ; change in internal energy is given by the sum of heat…

Q: The combustion of a sample of aluminium produces 0.25 mol of aluminium oxide and releases 419 kJ of…

A: The reaction given is, Given: Moles of Al2O3 produced = 0.25 mol. And the amount of heat released =…

Q: What is the value of ∆? in a system wherein a car engine that releases heat pushing the piston,…

A: By FLOT Internal energy change for the system ( ∆U): ∆U = ∆q + w      = -325 - 451       = - 776 J

Q: A cylinder contains a mixture of gases under constant atmospheric pressure. The gases undergo a…

A: It is given that a cylinder contains a mixture of gases at constant atmospheric pressure and the gas…

Q: When 8.36 g of a salt dissolves in 142 mL of water (density = 1.00 g/mL) in a coffee-cup…

A: Since you have posted multiple unrelated questions, we are entitled to answer the first only as per…

Q: a balloon filled with ammonia gas is injected with water. the balloon feels warm to the touch and…

A: Sign convention heat released = positive heat absorbed = negative

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 566.0 mg sample…

A: The amount of heat required to increase the temperature of one kilo gram of a substance by one…

Q: The value of ΔE for a system that performs 213 kJ of work on its surroundings and loses 79 kJ of…

A:

Q: 1 mole of an ideal gas is at 6 atm pressure, occupies 3 L and has an internal energy of 2735.1 J.…

A: Here the system undergoes two different paths.  Path-1 is constant volume process Path-2 is constant…

Q: .8 A sample consisting of 1.0mol CaCO3(s) was heated to 800 °C, at which temperature the solid…

A: Solution - According to the question - Given - The reaction is CaCO3 (s)   CaO (s) + CO2 (g) So, 1…

Q: Which of the following signs on q and w represent a system that is doing work on the surroundings,…

A: There are certain sign conventions related to work and heat based on system and surroundings.

Q: What is the change in internal energy of the system (AU) if 82 kJ of heat energy is absorbed by the…

A: According to the first law of thermodynamics, the internal energy is equal to the sum of heat…

Q: Consider the following thermochemical equation: Fe2O3 (s) + 2 Al (s) --> 2 Fe (s) + Al2O3 (s)   ∆H…

A: The answer to the following question is given as:

Q: (2.2) Gas in a container is at a pressure of 1 atm and a volume of 6 m3. What is the work done by…

A:

Q: 18. The combustion of propane is shown by the following equation: C,H;(g) + 50,(g) → 3CO,(g) +…

A:

Q: You have a cup of cold coffee and you placed it in a microwave oven to heat it until it boils.…

A: We know;  U = the internal energy of the system, a state function; q = heat;  w = thermodynamic…

Q: For each of the following processes, indicate whether the signs of ∆S and ∆H are expected to be…

A: If in a reaction, heat is absorbed then  ∆H is negative, while if heat is released, ∆H is positive.…

Q: The standard molar enthalpy of formation for oxygen gas, O2(g), is zero. The enthalpy of formation…

A: Molar enthalpy of formation of a substance is the energy required or released when one mole of a…

Q: If energy flows into a chemical system and out of the surroundings, what is the sign of ΔEsurr?

A: Given that,  Energy flows into a chemical system and out of the surroundings

Q: A cylinder and piston system releases 328 J of heat and does 144 J of work pushing the piston…

A:

Q: |The work done during the compression of a certain gas is 400 J, during this process there is no…

A: Sign convention of different thermodynamic parameters is highly important while solving problems…

Q: Consider what happens when a sample of the explosive TNT is detonated under atmospheric pressure.…

A: Given information,      A sample of the explosive TNT is detonated under atmospheric pressure

Q: A Bar Of Aluminum Of Mass 45.5g Is Heated From 293K To 85°C. How Much C Heat Is Absorbed By The…

A: Since you have asked multiple questions, we will solve the first question for you. If you  want any…

Q: III WICI a process occurs at constant external pressure. a) What is the sign of w for the system? Is…

A: Note : Since you have posted multiple questions, we are entitled to answer the first only. Please…

Q: Calculate ΔE for a system that absorbs 506.0  kJ of heat from its surroundings and does 379.0  kJ of…

A: It is a given that a system absorbs 506 kJ of heat and the system does 379 kJ of work on the…