The four laws of thermodynamics in everyday life

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   Dry ice turns to gas at -78.5 °C. How many kelvins above absolute zero is that, Ari?

   194.65 K
2. 2.

   Liquid nitrogen boils at -195.8 °C. How many kelvins above absolute zero is that, Bo?

   77.35 K
3. 3.

   Helium boils at -268.93 °C. How many kelvins above absolute zero is that, Esme?

   4.22 K
4. 4.

   "Energy in equals energy out plus energy stored" is which law, Jun?

   • The second law
   • The first law
   • The third law
5. 5.

   Why can't a car engine turn all of its fuel's heat into motion, Kira?

   • Engines run below absolute zero
   • Energy is destroyed as it burns
   • Some heat must flow to the cooler surroundings
6. 6.

   Why are kelvins used in thermodynamics, Luz?

   • Kelvins are warmer than °C
   • 0 K is absolute zero
   • Kelvins can be negative
7. 7.

   Noah says a phone battery destroys energy as it runs down. Agree or disagree?

   • Agree: phones make energy vanish
   • Agree: the battery uses the energy up
   • Disagree: the energy changes form
8. 8.

   Pia says the second law makes it impossible to tidy a messy room. Agree or disagree?

   • Disagree: tidying uses outside energy
   • Agree: rooms are isolated systems
   • Agree: disorder can't be lowered anywhere
9. 9.

   Which change lowers a substance's entropy, Tala?

   • Water boiling
   • Water freezing
   • Ice melting
10. 10.

    Salt dissolves in water. What usually happens to entropy, Zee?

    • It decreases
    • It increases
    • It drops to zero