One of the forms of energy that thermodynamics is principally concerned with is heat. Heat and temperature are not the s

Post by **answerhappygod** » Thu Jul 07, 2022 1:49 pm

: One Of The Forms Of Energy That Thermodynamics Is Principally Concerned With Is Heat Heat And Temperature Are Not The S 1 (42.32 KiB) Viewed 61 times

: One Of The Forms Of Energy That Thermodynamics Is Principally Concerned With Is Heat Heat And Temperature Are Not The S 2 (42.32 KiB) Viewed 61 times

: One Of The Forms Of Energy That Thermodynamics Is Principally Concerned With Is Heat Heat And Temperature Are Not The S 3 (51.59 KiB) Viewed 61 times

One of the forms of energy that thermodynamics is principally concerned with is heat. Heat and temperature are not the same thing, but they are related. If an amount of heat q is added to or withdrawn from a substance with mass m, its temperature will be changed by AT. Case 1 Case 2 Before 20.1 g H₂0 T:=20.0 °C After 20.1 g H₂O T₁ = 40.0 °C beaker q=+1682. ⇓ 40.2 g H₂0 T₁=20.0 °C 40.2 g H₂O Ty=40.0 °C beaker +9££+= b ⇓ Case 3 refrigerator -841. 20.1 g H₂O T₁=20.0 °C ⇓ 20.1 g H₂0 Ty 10.0 °C The amount of heat added or removed from a substance is related to the change in temperature by equation 1 (where C, is the substance's specific heat capacity). q=mC, AT (1)
Key Questions 1. Identify the system in each case in the Model and label it as either open, closed, or isolated. 2. Determine in each case whether heat is being added or removed from the system. How do you know? 3. Cases 1 and 2 in the Model illustrate endothermic processes while Case 3 illustrates an exothermic process. In an endothermic process, heat flows into the from the into the In an exothermic process, heat flows from the (Fill in each blank with either "system", "surroundings", "<", or ">".) and q _0. -0. and q 4. Determine the relationship between the amount of heat added/removed and the temperature change of the material. 5. How does the mass of the material affect the amount of heat that needs to be added/removed to accomplish a given temperature change? Exercises A. Use equation 1 and the data provided in the Model to calculate the specific heat capacity (C) of water. ii. B. Warming a 20.1 g sample of ethanol (CH3CH₂OH) from 20.0 °C to 40 °C requires 1033 J of heat. Answer the following questions. i. Without doing any calculations, do you anticipate the specific heat of ethanol to be greater than or less than water? (Circle one) Briefly explain your reasoning. Calculate the specific heat of ethanol.