Heat Transfer

 1) A hot piece of lead is dropped into water. Assuming that the only heat transfer is between the lead and the water, which of the following statements are true?

     (a) c_iron = c_water

     (b) q_lead = -q_water

     (c) T_final(H₂O) = T_final(lead)

     (d) Energy is transferred from the water.

 2) A hot piece of lead is dropped into water. Assuming that the only heat transfer is between the lead and the water, which of the following statements are true?

     (a) ΔT_lead is negative.

     (b) q_lead = q_water

     (c) q_water is positive.

     (d) T_final = ΔT_water - ΔT_iron

 3) You spill a hot cup of soup into your lap. Assuming that the only heat transfer is between the soup and your lap, which of the following statements are true?

     (a) Energy is transferred to your lap.

     (b) q_soup is positive.

     (c) ΔT_soup - ΔT_lap = 0

     (d) ΔT_soup is negative.

 4) You spill a hot cup of soup into your lap. Assuming that the only heat transfer is between the soup and your lap, which of the following statements are true?

     (a) Energy is transferred to the soup.

     (b) q_soup is negative.

     (c) ΔT_soup is positive.

     (d) -q_lap = q_soup

 5) A test tube of a room temperature reagent is placed into a beaker of hot water. Assuming that the only heat transfer is between the reagent and the water, which of the following statements are true?

     (a) Energy is transferred from the reagent.

     (b) ΔT_water = -ΔT_reagent

     (c) ΔT_water is negative.

     (d) -q_water = q_reagent

 6) A test tube of a room temperature reagent is placed into a beaker of hot water. Assuming that the only heat transfer is between the reagent and the water, which of the following statements are true?

     (a) q_reagent is negative.

     (b) Energy is transferred from the water.

     (c) q_water = -q_reagent

     (d) ΔT_water is positive.

 7) A test tube of a room temperature reagent is placed into a beaker of hot water. Assuming that the only heat transfer is between the reagent and the water, which of the following statements are true?

     (a) ΔT_solution is negative.

     (b) q_water = q_solution

     (c) q_water is negative.

     (d) T_final(water) = T_final(solution)

 8) You pour some cold water into a cup of hot coffee. Assuming that the only heat transfer is between the coffee and the water, which of the following statements are true?

     (a) q_water is positive.

     (b) Energy is transferred from the coffee.

     (c) c_coffee = -c_water

     (d) ΔT_coffee is positive.