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.

   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
2. 2.

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

   • +1630 J
   • 0 J
   • −1630 J
3. 3.

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

   • Positive
   • Zero
   • Negative
4. 4.

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

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

5. 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

6. 5.

   Using the table, which run was endothermic, Milo?

   • The glucose run
   • The ammonium nitrate run
   • The hot copper run
7. 6.

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

   • The hot copper run
   • The glucose run
   • The ammonium nitrate run
8. 7.

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

   • The water
   • Neither part
   • The copper piece
9. 8.

   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
10. 9.

    An ice cube melts in a glass of juice. Where does the ice get its heat, Tala?

    • From the glass's color
    • From the warmer juice
    • From its own cold
11. 10.

    A metal bench and a wooden bench are at the same temperature, but the metal feels colder. Why, Zee?

    • The metal bench is at a lower temperature
    • Metal takes heat from the hand faster
    • Wood makes heat of its own