Answer:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.
Explanation:
13.6 mol of CuCl2
you wanna use the factor label
Helium give me a thanks or brainiest answer if this helps!
I heard of this before I think I know the answers.
1st one, I'm thinking D. Because Turning Liquid into a Solid means like it would take energy out since its freezing.
2nd one, I would choose A
B and C why would they slow down if they were still in a solid. they attracted one another, but they stood still(Didn't move). D is explaining how Liquid turns into a Solid, so this is definitely incorrect. So I would choose A.
I really do hope this helps you out. (Idk about the 1st, but 2nd I think its the answer)
Evaporation,condensation, and precipitation.
