Activation energy is (1 point)
(0 pts) the heat realeased in a reaction
(0 pts) the energy barrier between reactants and products
(0 pts) the energy given off when reactants collide
(0 pts) generally very high for reaction that takes place reapidly

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?