Identify each energy exchange as primarily heat or work and determine whether the sign of ΔE is positive or negative for the system.a. Sweat evaporates from skin, cooling the skin. (The evaporating sweat is the system.)b. A balloon expands against an external pressure. (The contents of the balloon is the system.)c. An aqueous chemical reaction mixture is warmed with an external flame. (The reaction mixture is the system.)

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: The specific heat capacity of silver is 0.24 J/°C·g. Calculate the energy required to raise the…

A: Heat capacity is an extensive property.  But specific heat capacity is intensive property.  Heat…

Q: If we define the system as the reactants and products, what is the sign of work in this process,…

A: According to the first law of thermodynamics, the internal energy of a system can be changed by…

Q: Consider the following reactions: 3C(s) +4H,(g)→C;H,(g) AH° =-103.8kJ C(s) +0,(g)→ CO,(g) AH'…

A: Hess’s law- Change in enthalpy for a reaction is independent on path or steps followed by reaction.…

Q: In the late eighteenth century Priestley prepared ammonia by reacting HNO3(g) with hydrogen gas. The…

A: A reaction can be categorized as an endothermic or exothermic reaction. If the energy is released…

Q: Give 5 examples of instances or activities that require or produce energy.Where this energy came…

A: The 5 examples of energy are: a) cooking of food: In this process, the heat energy is converted to…

Q: 5.1.4 The label on packaged food indicates that it contains 215 Calper serving. Convert this amount…

A: Given data: The energy of packaged food = 215 Cal. To convert: Energy from Cal to joules (J).

Q: How much heat is produced when 6.26 g of zinc metal reacts with oxygen gas under standard…

A: We have to calculate energy release in combustion of Zn.

Q: 22. Write a reaction that corresponds to the Suppose a 50.0 g block of silver (specific heat =…

A: The question is based on the law of conservation of energy. whatever heat lost by hot silver metal…

Q: Using enthalpies of formation (See the Supplemental Data), calculate ΔH° (in kJ) for the following…

A:

Q: 23.12-gram metal bar sample at 76.21 °C is placed in a constant- pressure calorimeter containing…

A: In this problem the specific heat of metal bar is to find.

Q: When 13.8 mL of 0.870 M lead(1I) nitrate reacts with 90.0 mL of 0.777 M sodium chloride, 0.579 kJ of…

A: The balanced reaction taking place is given as, => Pb(NO3)2 (aq) + 2 NaCl (aq) ----> PbCl2 (s)…

Q: Use Equations a and b to determine ΔH for the following reaction.2CO(g) + 2NO(g) → 2C O 2 (g) + N 2…

A: The main equation or primary equation can be obtained by inverting equation (b) and then adding it…

Q: 0.81 g sample of KCl is added to 37.9 g H2O and stirred until KCl completely dissolves in a…

A: When KCl is mixed with water as we see temperature of the system decreases . Heat of solution is…

Q: Given the hypothetical thermochemical equation: A + B —> C + D ΔH = - 430 kJ A. The reaction is…

A: A multiple choice question based on thermochemical equation, which is to be accomplished.

Q: Usually in General Chemistry labs, this experiment is done as “Coffee Cup Calorimetry” using…

A: When sodium carbonate is dissolved in water a certain amount of heat is released . This heat…

Q: Ice at 0°C is placed in a Styrofoam cup containing 361 g of a soft drink at 23°C. The specific heat…

A: Answer:- This question is answered by using the simple concept of calorimetry which states that heat…

Q: In the system: C(s) + O2(g) + 2HCI(g) – COCI2(g) + H2O(g) + heat how is it possible to increase the…

A: A reaction is said to be in equilibrium if the rate of forward reaction is equal to the rate of…

Q: When 1.00 g of AgCl is formed by the reaction in a coffee cup calorimeter, the temperature of 20.0 g…

A: Heat absorbed by water can be calculated by using the formula:Q = m.Cp.∆T where, Q = heat absorbed/…

Q: Determine the efficiency of a camp stove given the following data: mass of propane burned = 4.48 g…

A: Interpretation- We have to determine the effciency of a camp stove on the basis of data as given…

Q: A 100 g hot metal ball at 80°C is placed in a fully insulated container containing 100 mL of water…

A: Volume of water V = 100 mL  Density of water = 1 g/mL mass of water M = ( 100 mL) (1 g/mL) = 100 g…

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

A:

Q: a. For an exothermic process, what is the sign of ΔSsurr? b. For an exothermic process, what is the…

A: a.)delta S of surroundings is greater than zero because an exothermic reaction is releasing energy.…

Q: fuel emits the most carbon dioxide

A: When a fuel is burned, the amount of CO2 (carbon dioxide) produced is a function of the content of…

Q: 13.68  g   Calculate the energy content of the food in kilocalories/gram. Peanut:  ___________…

A: Specific heat of water in calorie unit is 1 cal/g.°C  Here we have to calculate the energy content…

Q: Which of the following processes is endothermic?     a hot cup of soup (system) cools on a…

A: Answer:- this question is answered by using the simple concept of endothermic reaction in which heat…

Q: Which law of Thermodynamics explains why the "house always wins"? In other words, when it comes to…

A: Laws of thermodynamics states as– First law– Energy can neither be created nor be destroyed. It can…

Q: when 1 mole of iron metal reacts with hydrochloric acid at constant temperature and pressure to…

A: Given Reaction is between Iron metal and hydrochloric acid to produce Iron (II) chloride with a 87.9…

Q: Exothermic Endothermic Honer than suroundings Heat Heat Cooler than sunoundinge Heal Neal Heal Heat…

A: We know that,  Entropy measure randomness. It means that, more randomness means more entropy as like…

Q: Hydrogen is a very useful gas and can be used to produce energy for vehicle fuel via combustion…

A: The following characteristics of hydrogen has no contribution in making the hydrogen favorable as a…

Q: Work is done on the system and heat is absorbed by the system. What are the signs on heat and work?…

A: Solution: According to the IUPAC sign conversation, work done (W) by system means there is decrease…

Q: Exothermic Endothermic Heat Hotter than suroundings Heat Heat /Cooler than surroundings Heat Heat…

A: We know that,  Entropy measure randomness. If more randomness then more entropy.

Q: A 75.0 g piece of iron (CP = 25.09 J/(mol · °C)) was heated to a temperature of 47°C and then placed…

A: Mass of iron piece , mi=75.0 gSpecific heat capacity , Cp=25.09 Jmol.°CInitial Temperature ,…

Q: 10 of 11 <. Consider these reactions, where M represents a generic metal. 1. 2 M(s) + 6 HCI(aq) 2…

A: Delta H Is calculated as follows

Q: the same amount of heat is added to 5.00 g samples of each of the metals below, which metal will…

A: Specific heat capacity is amount of heat needed to increase the temperature of one gram of substance…

Q: We eat food every day for sustenance. Relate the idea of eating foods to the second law of…

A: The second law o thermodynamics deals with the quality of energy. It states that when energy changes…

Q: 19.64 g H2SO4 dissociated in 100.0 g of water in a coffee cup calorimeter. The temperature rose from…

A:

Q: In the past, scientists were surprised that an endothermic process like the one in this lab, could…

A: Spontaneous processes are irreversible processes that cannot be reversed. A spontaneous process…

Q: 15.A sample of 125 g of cold water and 283 g of hot water are mixed in an ideal thermos and thermal…

A: Given : Mass of cold water=125 g Mass of hot water=283 g Initial temperature of cold water=3∘C…

Q: A 251 g piece of lead (SH=0.160 J/g degrees Celsius) with an initial temperature of 90.5 degrees…

A:

Q: If you have a reaction that occurs in aqueous solution, and raises the temperature of 15.9 g of…

A: As the reaction is exothermic , it liberates heat  which rises the temperature of water so sign of…

Q: hot (158°F) of metal has a mass of 250 g and a specific heat of 0.25 cal/g·C°. John drops the metal…

A:

Q: For the chemical reaction below, which statement is true about the reaction? N2H4 (1) + O2 (g) → N2…

A: Work done prediction for a Chemical reaction involving gaseous species can be done as follows:

Q: After transfer of 1.40 kJ of thermal energy to a 0.752-kg block of copper the temperature is 43.4…

A: Consider the given information is as follows; q = +1.40 kJ = 1400 J Mass (m) = 0.752 g = 752 g…

Q: Consider the accompanying energy diagram. (a) Does thisdiagram represent an increase or decrease in…

A: Given diagram,

Q: The standard enthalpy changes of formation of iron(II) oxide, FeO(s), and aluminum oxide, Al203(s)…

A: The balanced reaction taking place is given as, Given : ΔHof [FeO(s) ] = -266 KJ/mol And ΔHof…

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: In an experiment, 9.80 g of olive oil at 80.0 degrees celisus are quickly transferred to water in a…

A: Given:Mass (m) of olive oil at 80.0 oC is 9.80 gThe temperature of water in the calorimeter is…