What is something a scientist could add to or subtract from an unknown substance that will always reveal information about the physical and/or chemical properties of the substance?(1 point) iodine

light

heat

vinegar

What type of reaction is zn + cucl2 → cu + zncl2?

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins.co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)