How do catalysts increase the rate of a chemical reaction?
they lower the activation energy.
they lower the collision energy.
they increase the collision energy.
they increase the temperature.
they increase the concentration of reactants.

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .