1. A 2.5 g piece of lithium metal is dropped into a 500.0 g sample of water at 22.1°C. The temperature of the water increases to 23.5 °C.
1. Is the reaction between lithium and water endothermic or exothermic. Explain.
2.
How much heat energy is released in the reaction?
3.What is the heat released by the reaction in J for lithium?

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.