Se enfría un bloque de aluminio de los 500° C a los 40° C. ¿Cuál es la masa del bloque si pierde 90 kcal de calor?​

What are the concentrations of hydroxide and hydronium ions in a solution with a ph of 10.2?

Which is true of chemicals? a. things containing chemicals always cost a lot of money. b. chemicals are never dangerous. c. chemicals are in many substances in a home. d. chemicals are rarely found on earth.

What is the binding energy of a nucleus that has a mass defect of 5.81*10-^29 kg a 5.23*10-^12 j b 3.15* 10^12 j c 1.57*10-3 j d 9.44*10^20 j