Which two (2) of the following reaction types is exothermic? CaCl2(s) + 2H20 --> Ca(OH)2 (aq) + 2HCI + heat Jb Melting Ice Oc N2 + O2 + energy --> 2NO Do H2 + 12 --> 2H1 + energy​

Ineed the answer to question 1 , i’m desperate

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths