1. I was surprised at the color changes that took place when we mixed two different substances together.
2. Some observations that showed a chemical reaction had taken place were color change and temperature change.
3. In the precipitation reactions all of the end products were solids, but when we did the molecular substances we got different results. With the combination of sulfuric acid and sodium carbonate it resulted in carbon dioxide (a gas) and water (a liquid) being produced.
4. When salt is poured into water it dissolves, so the sodium and the chlorine separate from each other.
NaCl (crystals) + H2O = Na+ (aq) + Cl- (aq) + H2O (L)
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