Heat flow and the final temperature of a mixture
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Ari puts a 0.5 kg aluminum block (c = 897) at 100 °C into 1 kg of water at 20 °C in an insulated cup. What is the final temperature to 0.1 °C?
Bo puts a 1 kg copper block (c = 385) at 90 °C into 0.5 kg of water at 20 °C in an insulated cup. What is the final temperature to 0.1 °C?
Esme puts a 2 kg iron block (c = 449) at 80 °C into 2 kg of water at 15 °C in an insulated cup. What is the final temperature to 0.1 °C?
1 kg of aluminum at 80 °C goes into 1 kg of water at 20 °C in an insulated cup. Which final temperature is reasonable, Kira?
- About 70 °C
- 50 °C, halfway
- About 31 °C
Which change would bring a block-and-water mix's final temperature closer to the block's starting temperature, Luz?
- Using less water
- Stirring for longer
- Using more water
Milo says cold flows from an ice pack into a warm box. Agree or disagree?
- Agree: ice packs give off cold energy into the warm box
- Disagree: heat flows from the box into the ice pack
- Agree: cold moves the way heat does
Noah says a metal block feels colder than a wooden block at the same room temperature because the metal is colder. Agree or disagree?
- Agree: wood makes its own heat
- Disagree: metal carries heat away faster
- Agree: metal holds more cold than wood does
A team tests how much a hot metal block warms water. Which step makes the result more accurate, Ren?
- Using an insulated cup with a lid
- Measuring once, quickly
- Using an open metal pan
Why should the water be stirred before reading the final temperature, Tala?
- So the whole sample is at one temperature
- To make the block lighter
- To cool the thermometer down
A measured final temperature is 2 °C below the prediction. What is the most likely reason, Zee?
- Some heat escaped to the cup and the air
- The water made extra cold
- Energy was destroyed in the cup