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A closed system can exchange matter but not energy with the surroundings.
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Q71: The number of valence electrons for atomic
Q81: What is the mass percent of H<sub>2</sub>O
Q98: The substance NH<sub>3</sub> is a:<br>A)weak acid<br>B)strong acid<br>C)salt<br>D)weak
Q101: Calculate the work,w,gained or lost by the
Q112: Which of the following is most likely
Q116: What is the energy in joules of