The specific heat capacity of liquid ethanol is 2.42 J/gºC. How many joules of heat must be absorbed by 0.463 g ethanol to change its temperature from 51.6 °C to 82.4 °C?
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Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

All of the following are part of the biosphere except

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.