List two possible steps where impurities may be gained, which would appear to be an increase in copper yield (why you may get more than 100% of the copper back at the end). Be specific about the steps and

how they might add impurities.

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aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

the answer is c.the valence of the atoms combine .