1.The splitting of a heavy, unstable nucleus into two lighter nuclei is called . a. Fission
b. Fusion
c. Radioactive Decay
d. Isotopes

Iknow the answer is a but i don't know why

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?