In the equation q - mc (delta T), c is the symbol for: Select one: O a. specific

Question

In the equation q - mc (delta T), c is the symbol for: Select one: O a. specific heat O b. calorimetry c, speed of light O d. concentration If the initial temperature is 100.0 °C and the final temperature is 50.0 °C, what is delta T? Select one: O a. 100.0C b.-25.0 C .-50.0 d. 50.0 A 10.0 g sample of an unknown metal was heated to 100.0 °C and then added to 20.0 g water at 23.0 C in an insulated calorimeter. At thermal equilibrium, the temperature of the water and the metal ih the calorimeter was 25.0°C. Calculate the specific heat of the metal in order to determine which of the metals in this list is most likely to be the unknown. Specific heat data (J/g C): H24.184; Au(e) 0.13, Ag(s) 0.22; Al(s) 0.90 Select one: O a. H2O b. Al c. Au d. Ag

Explanation / Answer

Q1

Q = m*C*(dT)

Q = heat

m = mass

C = specific heat capacity

dT = change in T

Q2

dT = TFinal - Tinitial

dT = 50 - 100

dT = -50°C

choose C

Q3.

m = 10 g of metal

Qmetal = m*C*(Tf-Tm) = 10*Cp*(100-25)

Qcal = m*C*(Tf-Tw) = 20*4.184*(25-23) = 167.36

-Qmetal = +Qcal

- 10*Cp*(100-25) = 167.36

Cp = 167.36 /((100-25)*-10)

Cp = 0.2231 J/gC

this must be Ag(s), i.e. Silver

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