Achemist finds that when platinum is added to a reaction, the reaction speeds up. he thinks the platinum may be acting as a catalyst. what measurement should the chemist make to determine whether it is a catalyst?

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

Which sections of the heating curve illustrate this process?