Observing Changes – Lab
To observe and discover properties of chemical and physical properties of water, copper sulfate powder, iron (wool), sodium carbonate, hydrochloric acid, and magnesium and how they react with one another. Hypothesis:
We can recognize physical and chemical changes from the way substances react with one another. It’s a physical change when its size, shape, state, solution changes and it’s often easy to reverse. Chemical changes is when there is a change of color, precipitate forming, heat or light being given off, or change in odor and it’s often hard to reverse. Observations:
Part 1: Copper (II) Sulfate and Water
Properties of water Clear, odorless, tasteless, and is a liquid. Properties of copper (II) sulfate Blue, powder, and is a solid. After we put some copper (II) sulfate in the test tube followed by 4cm of water the water turned kind of blue, then when we put the cap on the test tube and shook it, the copper sulfate dissolved in the water and it turned bluer. I also observed that after shaking there were still pieces of the copper sulfate at the bottom of the test tube. This change was a physical change because there was a change in color (chemical) and a change if form (physical). I would argue that this is a physical change because you could easily get some of the copper (II) sulfate back by heating it up and let the water evaporate, also no new substance was found when mixing those two substances together. Although the color changed it’s still reversible. Part 2: Copper (II) Sulfate Mixture and Iron (wool)
Properties of Copper (II) Sulfate and Water Blue, and is a liquid. Properties of Iron (steel-wool) wire-like, grayish, fluffy, looks like hair ball, and is a solid. After we gently placed the iron (steel-wool) in the copper (II) sulfate and water mixture nothing happened. After a few minutes the wool lost its color and turned red, it just settled at the bottom of the test tube. The piece of iron was...
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