Chemistry, 09.07.2019 12:30 jaylennkatrina929
In a chemical cold pack, two substances are kept separate by a divider. when the divider is broken, the substances mix and absorb heat from the surroundings. the chemical cold pack feels cold.
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Chemistry, 22.06.2019 16:00
As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit
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In a chemical cold pack, two substances are kept separate by a divider. when the divider is broken,...
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