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classifying matter: mastery test
select all the correct answers.
which of the following are considered pure substances?
element
congound
homogeneous mixture
heterogeneous mixture
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Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Answer trigonal pyramidal;

"electrical energy" transforms to "thermal energy".hope my answer has you : )