1. A cylinder with a movable piston contains 2.00 g of helium. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 2.70 L? (The temperature was held constant.)
2. Circle the word that will make the statement correct.
a. As a piston compresses air in cylinder, the gas pressure increases/decreases.
b. As a balloon cools in a freezer, its volume increases/decreases.
c. As car drives on a highway, the tire pressure increases/decreases.