Another student writes the following incorrect synthesis reaction of magnesium oxide. Ca + O → CaO
Describe the error made by the student.

passing a magnet thought the

mixture , because iron gets attracted to magnet .

c is the answer because when something is left after something evaporates that shows the chemical change.

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