if i have 500g of krypton-85 how much remains and how much time passes after 4 half lives pass (krypton’s half life is 10.8 years)

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?