Chemical Changes and Chemical Properties?
In each situation, decide whether a chemical rxn is releasing energy and causing work to be done, or whether an outside source of energy is forcing a chemical rxn to occur.
a. Your body converts excess intake of food into fat molecules.
b. Sodium reacts with water.
c. Sodium azide in an automobile air bag decomposes, causing the bag to inflate.
d. An egg is hard-boiled in a pan on your kitchen stove.
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a. this seems more biology, but any conversion from one form (glucose) to another (fat) requires external energy
b. this definitely releases energy because the glass gets warm, a big enough piece of sodium (Na) ignites a fire and moving down the periodic table to Cesium (Cs) will actually cause an explosion
c. airbags need to be plugged in so that the initial electrical charge (energy) can make the sodium azide decompose
d. denaturing the proteins in an egg (hard-boiling) requires external heat energy
and yes, read your textbook
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