How can we test whether a substance is a metal or a non-metal

Predict the products butane (c4h10) + oxygen —>

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Rays from the sun are not considered matter true or false