In a chemical cold pack, two substances are kept separateby a divider. When the divider is broken, the substancesmix and absorb heat from the surroundings. The chemicalcold pack feels cold. Is the reaction exothermic or endothermic?Draw an energy diagram showing the relative energiesof the reactants and products in the reaction.

Q: How much heat is required to warm 1.50 L of water from 25.0 °C to 100.0 °C? (Assume a density of 1.0…

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Q: Which statement is true of energy in reactants during an endothermic reaction? The energy found in…

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Q: Given the specific heat of lead is 0.129 J/g.C and that it takes 93.4J of energy to heat a sample of…

A: Specific heat It is amount  of heat required to change the temperature of a substance by 1 Degree of…

Q: Which of the following is true about an exothermic reaction? O The number of moles of products is…

A: ''In exothermic reaction, heat is released" therefore heat of reaction is negative

Q: Because water has such a hyh specific heat capacity, it heats and cools more slowly than land. How…

A: Water has a high specific heat capacity which means that water needs more energy to raise its…

Q: Mass of hot water  89 g Mass of cold water  90 g T hot water  70 °C T cold water  27 °C T mixture…

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

Q: 62. In a chemical cold pack, two substances are kept separate by a divider. When the divider is…

A: The chemical reaction has to be predicted as exothermic (or) endothermic reaction. The energy…

Q: Which of the following changes is endothermic? * O melting of copper O freezing of water O…

A: In endothermic reactions, ∆H is positive and heat or energy is absorbed.

Q: 3. How much heat (in kJ) is required to heat this kettle from 23°C to 99°C contains 1.25 L of water…

A: We have to calculate heat required to heat kettle from 23°C to 99°C, having 1..25L water

Q: Can you help me, im confused on how to do this So can you help me understand it by showing how to…

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Q: In the laboratory a student uses a "coffee cup" calorimeter to determine the specific heat of a…

A: Mass of chromium, m1 = 18.5 g Mass of water, m2 = 81.3 g Temperature of chromium, T = 98.04 °C…

Q: A 55-gram aluminum spoon (specific heat 0.88 J/g°C) at 54°C is placed in 150 mL of coffee at 105°C…

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Q: The specific heat of a 70 g sample is 0.069 J/(g·K). If it absorbs 96 J when it is heated from a…

A: Heat energy required to raise the temperature of body of 1gram of  mass to 1°c is known specific…

Q: Which statement concerning energy changes in chemical reactions is FALSE? In an endothermic…

A: The heat change accompanied by the reaction's propagation is known as its "enthalpy change". It is…

Q: Which statement is true about endothermic and exothermic reactions?  Energy is absorbed in an…

A: Exothermic reactions are the reactions in which energy is released from the system to the…

Q: When a 4.25 g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee- cup…

A: 1) Since the temperature of the water in coffee-cup calorimeter is decreasing from 22 to 16.9 oC…

Q: how many grams of iron

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Q: Calssify the following process as endothermic or exothermic. A match burns  Ice melts  Molten metal…

A: When heat is released from the system then reaction is called exothermic and when heat is absorbed…

Q: 3. a. What is the specific heat of a 41.5 g piece of glass, if it takes 17.8 kJ of heat to raise its…

A: (3a) Specific heat of a Substance can be calculated by using Following formula - Q = C M ∆T Here, Q…

Q: Is a burning candle an endothermic or exothermic reaction?

A: Exothermic reaction in which heat is released and endothermic reaction in which heat is gained In…

Q: 5. If you hold snow, the snow begins to melt and your hand feel cold. This is because melting snow…

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Q: If 200g of water at 20°C absorb41840 J of energy, what will the final temperature be? The specific…

A: Given: Mass of water=200 g Temperature change, ∆T=(T-20.0)°C Heat absorbed, q =41840 J Specific…

Q: A coal-burning power plant generates electrical power at a rate of 450 megawatts (MW), or 4.50 x 108…

A: Heat is that energy which is transferred from one body to another which creates difference in…

Q: Hydrogen sulfide, H2S, is produced during decomposition of organic matter. When 0.6850 mol H2S burns…

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Q: 8. A 7.0-gram metal sample absorbed 211 J of heat as it was heated from 28°C to 85°C. W containing…

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Q: A 45g silver spoon (specific heat 0.24 J/g.°C) at 25 °C is placed in 180 g of coffee at 95 °C and…

A: The final temperature of the spoon and coffee will be same.  we know , Heat = ms∆T(m is…

Q: -ntify the following as exothermic or endothermic. q = -1200 J AH = 527 kJ Two chemicals mis…

A: 1)     q = -1200 J   HEAT GIVEN BY THE SYSTEM IS TAKEN AS NEGATIVE,CLEARLY HEAT IS GETTING OUT OF…

Q: Directions: Please complete this worksheet on a separate piece of paper. 1. What is the specific…

A: Given :  1. Mass of aluminum = 28.4 gm   Heat given = 207 J Increase in temperature = 8.1 ° C  2.…

Q: A 1467 kg1467 kg car is traveling down the road at 81.0 km/h.81.0 km/h. While traveling at this rate…

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Q: Water (2750 g ) is heated until it just begins to boil. If the water absorbs 5.55 x 10³J of heat in…

A: The amount of energy absorbed by a substance depends upon the mass of the substance, specific heat…

Q: en the thermochemical equation : O2(g) + O₂(g) Ⓡ2SO3(g), DH rxn= -198 kJ/mol, w much heat is evolved…

A: Given: 2SO2(g)+O2(g)→2SO3(g)   ∆Horxn=-198 kJ/mol Mass of SO2 is 600 g To find: Heat evolved

Q: The specific heat of copper is 0.385 J/g°C. Calculate the final temperature when 25.0 g of copper…

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Q: If 1001 J of heat is available, how many grams of iron (specific heat = 0.45 J/g･°C) can be heated…

A: The equation is:

Q: Hydrogen sulfide is produced during the decomposition of organic matter. When 0.5380 mol H2S burns…

A: Given: H2S burns to produce SO2(g) and H2O(g) with heat release of -278.7 kJ

Q: What is the specific heat of tin if a 55.0 g sample absorbs 982 j of heat to raise its temperature…

A: The heat absorbed (q) by a system is given by, q=m.c.∆T where m is the mass, c is the specific heat…

Q: If you wish to heat 4.0 L of water on the wood stove from 10.0 °C to 90.0 °C, how much heat must…

A: To solve this problem, we have to use formula which is- Q=m.c.dT Where m is the mass c= specific…

Q: A potato chip is burned in an incomplete combustion reaction, and the heat energy is transferred to…

A: The mass of water is determined as follows. mwater=dwater×Vwater=1.00 g/mL×150 mL=150 g

Q: What is the heat, q, in joules transferred by a chemical reaction to the reservoir

A: Given :-  mass = 155 g  Initial temperature = 22.0°C  Final temperature = 26.5 °C  Specific heat…

Q: The specific energy and density of gasoline is -47.3 MJ/kg and 716 kg/m3, respectively. What is its…

A: Specific energy: It is the energy required for one unit of mass. Energy density: The amount of…

Q: True or False If the statement is true, write "true." If it is false, change the underlined word or…

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Q: Rachel West Section 017 A thermometer placed in a solution undergoing a chemical reaction indicates…

A: This is the case of a reaction under thermodynamic enthalpy change , According to thermodynamic…

Q: How much heat is required to raise the temperature of 15 x 10g of water from 45F to 130F? The…

A: Answer: This question is based on the following formula: Q=mS∆There:Q=heat exchangedm=mass of the…

Q: Which statement is incorrect about an endothermic change in a chemical reaction? O a) potential…

A: Here we have to find the incorrect statement about an endothermic reaction among the given…

Q: classify each of  the following as exothermic or endothermic and give the change in heat, C3H8(g)…

A: Exothermic Reaction: Reaction in which heat is released. ΔH is negative for exothermic reactions.…

Q: A piece of copper alloy with a mass of 85.0g is heated from 30.0°C to 45.0°C. In the process, it…

A: To solve this problem we will use the formula   Q = m • C • ∆T   Where,  Q = heat absorbed  m = mass…

Q: E. A chemical change involves a change in the composition of matter-the formation of a new chemical…

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Q: A 23-g sample dissolved in water absorbs heat, increasing its temperature from 30°C to 45 °C. What…

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Q: Which of the following is true about an exothermic process? An exothermic process feels hot to touch…

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