The four laws of thermodynamics in everyday life

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   A gas is squeezed with 450 J of work done on it, and it gives off 600 J of heat. What is the change in its internal energy, Bo?

   -150 J
2. 2.

   A gas is squeezed with 250 J of work done on it, and it gives off 90 J of heat. What is the change in its internal energy, Esme?

   160 J
3. 3.

   Ice melts in a warm room. What happens to the water's entropy, Kira?

   • It decreases
   • It increases
   • It stays at zero
4. 4.

   A drop of food coloring spreads through still water by itself. Which law does this show, Luz?

   • The second law
   • The zeroth law
   • The third law
5. 5.

   Why does a refrigerator need to be plugged in, Milo?

   • Cold has to be made from electricity
   • Moving heat from cold to hot takes work
   • Food gives off cold
6. 6.

   Hot soup sits in a cool kitchen. Which way does heat flow, Noah?

   • No way: they're apart
   • From the room to the soup
   • From the soup to the room
7. 7.

   What happens to the universe's entropy during a spontaneous change, Pia?

   • It decreases
   • It drops to zero
   • It increases
8. 8.

   What is absolute zero, Ren?

   • 0 K, the lowest temperature
   • 0 °C, where water freezes
   • 100 K, the coldest gas
9. 9.

   What does the third law say about a perfect crystal at 0 K, Tala?

   • Its entropy is at a maximum
   • Its entropy is zero
   • It turns into a gas
10. 10.

    Why does a perfect crystal at 0 K have zero entropy, Zee?

    • Its particles have vanished
    • It has the most freedom to move
    • Its particles have one arrangement