During which change is heat energy released?
a. melting
b. boiling
c. sublimation
d. condensation

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Which of these conditions most likely produces an unstable isotope?

How many grams of ammonia would be produced by the decomposition of 16.93 mlof hydrazine? (the density of hydrazine is 1.021g/ml)