What is a system called when neither energy nor matter is exchanged between the system and the surroundings?

A) Closed system
B) Free energy
C) Isolated system
D) Open system

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?

What is the percent by mass of magnesium sulfate in mgso4.7h2o

Which order shows the levels of organization from largest to smallest? organism, organ system, cell, organ, tissue organism, tissue, organ system, organ, cell organism, organ, organ system, cell, tissue organism, organ system, organ, tissue, cell