If an endothermic reaction absorbs heat, then why does it feel cold to the touch?
If an endothermic reaction absorbs heat, then why does it feel cold to the touch?
Match the words in the left column to the appropriate blanks in the sentence on the right.
An endothermic reaction feels cold to the touch because the reaction (acting here as the system) absorbs heat from the surroundings. When you touch the vessel in which the reaction occurs, you, being part of the surroundings, lose heat to the system (the reaction), which makes you feel cold. The heat absorbed by the reaction (from your body, in this case) does not increase its temperature, but rather becomes potential energy stored in chemical bonds.Homework Answers
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If an endothermic reaction absorbs heat, then why does it feel cold to the touch?
Explain why does metal feel cold when you touch it. Please us the terms heat transfer,...
Explain why does metal feel cold when you touch it. Please us the terms heat transfer, exothermic and endothermic.
5. 83 kJ of heat are exchanged between the system and surroundings in an endothermic reaction,...
5. 83 kJ of heat are exchanged between the system and surroundings in an endothermic reaction, and the system does 2.0 k) of work on the surroundings. Which of the following statements are true? a. q>0, w <0, AE >O b. q<0, w<O, AE > C. q< 0, w < 0, AE < 0 d. 9>0, w >O, AE > e. The answer cannot be determined from the information provided
help on B and F. 1. Propane, CzHs, burns in air. The reaction is exothermic and...
help on B and F.
1. Propane, CzHs, burns in air. The reaction is exothermic and the enthalpy change is equal to -2044 kJ/mol. a. Give the correct balanced chemical equation to represent the combustion of propane. CH₂ 191 +50201 320 (s) + 4H₂O(g) b. Fill in the blanks using information from the balanced thermochemical equation. mol rxn - mol CH3 - _ mol O2 = _ mol H20 - _ mol CO2- c. Circle your choice to complete the...
Calculate AU of a gas for a process in which the gas absorbs 29 J of...
Calculate AU of a gas for a process in which the gas absorbs 29 J of heat and does 31 J of work by expanding A. 21 B. 60) C. -60J D. -2J Which of the following statements is not true for an exothermic reaction? A. Heat passes from the reaction system to the surroundings. B. The products have a higher heat content than the reactants. C. The temperature of the reaction system increases D. The enthalpy change for the...
part a. The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 110 J of heat. As it...
part a. The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 110 J of heat. As it expands, it does 79 kJ of work. What is the change in internal energy for the system? Express the energy in kilojoules to two significant figures. part b. When fuel is burned in a cylinder equipped with a piston, the volume expands from 0.235 L to 1.350 L against an external pressure of 1.02 atm...
Lab 9 Heat of Reaction OBJECTIVE: To experimentally determine the heat of reaction for two exothermic...
Lab 9 Heat of Reaction
OBJECTIVE:
To experimentally determine the heat of reaction for two
exothermic reactions.
DISCUSSION:
The heat given off or gained in a reaction is called the heat
of reaction (∆?????????).
A reaction that releases heat is known as an exothermic
reaction; an endothermic reaction
is one that absorbs heat.
The heat of the reaction corresponds to one mole of the
reactant and is expressed in
kilocalories per mole of reactant or in kilojoules per mole of...
Lab 14 Heat of Reaction Objective: To experimentally determine the heat of reaction for two exothermic...
Lab 14 Heat of Reaction Objective: To experimentally determine the heat of reaction for two exothermic reactions. Consider the following equations. (1) Mg(s) + 2HCI → MgCl2(aq) + H2(g) Hz(8) AH = ? (2) MgO(s) + 2HCl(aq) → MgCl(aq) + HOH (1) AH2 = ? The reactions represented by equations (1) and (2) will be our experimental work for today. Background: The heat given off or gained in a reaction is commonly called the heat of reaction. A reaction that...
1.. When a hydrogen (H) atom collides with a chlorine (Cl2) molecule, the following reaction occurs...
1.. When a hydrogen (H) atom collides with a chlorine (Cl2) molecule, the following reaction occurs with release of energy: H (g) + Cl2 (g) --> HCl (g) + Cl (g) Which ONE of the following statements is true? Group of answer choices a. The relative bond strengths cannot be determined from the information provided. b. The H – Cl bond is stronger than the Cl – Cl bond. c. The H – Cl bond is weaker than the Cl...
30. Which of the following is not true about the electromagnetic spectrum? a. ultraviolent light (UV)...
30. Which of the following is not true about the electromagnetic spectrum? a. ultraviolent light (UV) has a shorter wavelength than does visible light b. the energy of a wave is continuous c. the energy of a wave is proportional to the frequency d. The energy of a wave in inversely proportional to the wavelength True/false 31 The shape of a molecule influences the amount of radiation that can be absorbed 32_ __Carbon atom always forms four bonds 33___Water vapor...
Write out your separation scheme for this experiment. 1. Heat 75 mL of water to 90...
Write out your separation scheme for this experiment. 1. Heat 75 mL of water to 90 °C in a 250-mL beaker. 2. While the water is being heated, place 250 mg of salicylic acid, 1 drop of 85% phosphoric acid and 0.5 mL of acetic anhydride in a test tube. Add a boiling chip to the mixture and gently shake it in order to mix the reactants. 3. Heat the tube in the beaker of water at 85 - 90...
5. 83 kJ of heat are exchanged between the system and surroundings in an endothermic reaction, and the system does 2.0 k) of work on the surroundings. Which of the following statements are true? a. q>0, w <0, AE >O b. q<0, w<O, AE > C. q< 0, w < 0, AE < 0 d. 9>0, w >O, AE > e. The answer cannot be determined from the information provided
help on B and F.
1. Propane, CzHs, burns in air. The reaction is exothermic and the enthalpy change is equal to -2044 kJ/mol. a. Give the correct balanced chemical equation to represent the combustion of propane. CH₂ 191 +50201 320 (s) + 4H₂O(g) b. Fill in the blanks using information from the balanced thermochemical equation. mol rxn - mol CH3 - _ mol O2 = _ mol H20 - _ mol CO2- c. Circle your choice to complete the...
Calculate AU of a gas for a process in which the gas absorbs 29 J of heat and does 31 J of work by expanding A. 21 B. 60) C. -60J D. -2J Which of the following statements is not true for an exothermic reaction? A. Heat passes from the reaction system to the surroundings. B. The products have a higher heat content than the reactants. C. The temperature of the reaction system increases D. The enthalpy change for the...
Lab 9 Heat of Reaction
OBJECTIVE:
To experimentally determine the heat of reaction for two
exothermic reactions.
DISCUSSION:
The heat given off or gained in a reaction is called the heat
of reaction (∆?????????).
A reaction that releases heat is known as an exothermic
reaction; an endothermic reaction
is one that absorbs heat.
The heat of the reaction corresponds to one mole of the
reactant and is expressed in
kilocalories per mole of reactant or in kilojoules per mole of...
Lab 14 Heat of Reaction Objective: To experimentally determine the heat of reaction for two exothermic reactions. Consider the following equations. (1) Mg(s) + 2HCI → MgCl2(aq) + H2(g) Hz(8) AH = ? (2) MgO(s) + 2HCl(aq) → MgCl(aq) + HOH (1) AH2 = ? The reactions represented by equations (1) and (2) will be our experimental work for today. Background: The heat given off or gained in a reaction is commonly called the heat of reaction. A reaction that...
30. Which of the following is not true about the electromagnetic spectrum? a. ultraviolent light (UV) has a shorter wavelength than does visible light b. the energy of a wave is continuous c. the energy of a wave is proportional to the frequency d. The energy of a wave in inversely proportional to the wavelength True/false 31 The shape of a molecule influences the amount of radiation that can be absorbed 32_ __Carbon atom always forms four bonds 33___Water vapor...
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