Question 10. A 100-g aluminium calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Two metallic blocks are placed in the water. One is a 50-g piece of copper at 80°C. The other sample has a mass of 70 g and is originally at a temperature of 100°C. The entire system stabilizes at a final temperature of 20°C. Determine the specific heat of the unknown second sample.
Question 17: Calculate the electrode potential and identify the anode and cathode metal of this cell “Fe vs Zn” then label the anode, cathode, and show the direction of electrons flow.
Question19: A capacitor with a dielectric. A parallel plate capacitor, having a plate area of 45.0 cm2 and a plate separation of 2.00 mm, is charged by a 120 V battery. The battery is then removed. Find:
a. the capacitance of the capacitor. (vacuum or air space between two parallel plates)
b. the charge on the plates of the capacitor. (vacuum or air space between two parallel plates)
A slab of mica is then placed between the plates of the capacitor.
c. the new value of the capacitance.
d. the potential difference across the capacitor with the dielectric.
e. the initial electric field between the plates.
f. the final electric field between the plates.
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