Types of Chemical Reactions Data: Reaction Observations Evidence It turned a reddish brown and the liquid went clear. The color change proved it was a chemical change. The reaction turned yellow and it separated and created a fog. The solid formed precipitation and had a color change during the reaction proving it to be a chemical change. #3 There was green smoke and the crystals turned black. The green liquid turned dark green and continued to sizzle with water which turned the whole reaction to a liquid.
The evidence is in the color change and when it created smoke.
It also sizzled up which proved it to be a chemical change. #4 It bubbled clear and during the reaction continued to make a popping noise. It also fizzed up and created a gas. When it bubbled and turned into a gas was the evidence to identify it as a chemical change. Also when it created the popping sound when the stick was placed in the tube.
#5 The water turned black and created smoke rings. It made the glow stick ignite back on fire. The chemical change was when it bubbled to make a gas. Also when the reaction created a fire was when a chemical change was present.