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General chemistry
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General chemistry
Destructive interference
Chemistry; General chemistry
When the peaks of one wave match the troughs of another, the waves interfere destructively. The amplitudes of the interfering waves cancel to give the resultant wave a lower amplitude.
Mass percentage
Chemistry; General chemistry
Mass percentages express the concentration of a component in a mixture or an element in a compound. For example, household bleach is 5.25% NaOCl by mass, meaning that every 100 g of bleach contains ...
Standard hydrogen electrode
Chemistry; General chemistry
A platinum electrode that runs the half reaction 2 H+(aq, 1M) + 2 e- H2(g, 1 atm), chosen as a reference for cell voltages. The electrode potential of the standard hydrogen electrode is defined to ...
Bond energy
Chemistry; General chemistry
Energy change per mole when a bond is broken in the gas phase for a particular substance.
Hormone
Chemistry; General chemistry
A molecule produced by endocrine glands that controls specific biological processes like growth and metabolism.
Polar bond
Chemistry; General chemistry
A bond involving electrons that are unequally shared. Polar bonds can be thought of as intermediate between the extremes represented by covalent bonds and ionic bonds .
Zone refining
Chemistry; General chemistry
A method for purifying solids based on the fact that solutes tend to concentrate in the liquid when a solution is frozen. A solid bar is drawn slowly over a heat source and melted in a narrow band; ...
