What is the percent composition by mass of ammonium chloride in a saturated solution of ammonium chloride at 45°C

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure