Read calorimetry data: heat moves from hot to cold

Answer Key - Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   A copper piece warms 60 g of water from 22 °C to 28.5 °C. Using c = 4.18 J/(g·°C), how much heat did the water gain, Ari?

   1630.2 J
2. 2.

   A steel rod warms 425 g of water from 24 °C to 42.7 °C. Using c = 4.18 J/(g·°C), how much heat did the water gain, Bo?

   33,220.6 J
3. 3.

   In a cold pack, 50 g of water goes from 24.9 °C to 20.3 °C. Using c = 4.18 J/(g·°C), what is the water's q, Esme?

   -961.4 J
4. 4.

   The water gains 1630 J from a hot copper piece. What is q for the copper, Jun?

   • 0 J
   • +1630 J
   • −1630 J
5. 5.

   In a cold pack the water's q is negative. What sign does q have for the dissolving, Kira?

   • Positive
   • Zero
   • Negative
6. 6.

   The water's ΔT is +6.5 °C. What happened to the water, Luz?

   • It lost heat
   • Its mass grew
   • It gained heat

7. Read this first

   Three described calorimeter runs (OpenStax Examples 5.4, 5.6 and 5.7)

   run	water before (°C)	water after (°C)
   hot copper piece in water	22	28.5
   ammonium nitrate dissolving (cold pack)	24.9	20.3
   glucose burned in a sealed steel calorimeter	23.8	35.6

8. 7.

   Using the table, which run was endothermic, Milo?

   • The glucose run
   • The ammonium nitrate run
   • The hot copper run
9. 8.

   Using the table, which run changed the water's temperature the most, Noah?

   • The glucose run
   • The hot copper run
   • The ammonium nitrate run
10. 9.

    Using the table, in the copper run, which part lost heat, Pia?

    • The copper piece
    • Neither part
    • The water
11. 10.

    Why does a mug of hot cocoa cool down on the table, Ren?

    • Cold from the air flows into it
    • It gives heat to the cooler air
    • Its heat is destroyed