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The amount of KCl that was recovered is exactly the same as what we began with.
The KCl was able to completely regain its crystal shape when the water evaporated. We may conclude that our alteration was simply physical if 20g of the KCl were still in the beaker. This would show that none of our KCl was utilized in any chemical reactions.
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A student mixes 20.0 g of white KCI crystals with distilled water in a beaker. After stirring the mixture, no crystals are seen and the solution is clear. After several days, all the water evaporates and white crystals are found in the beaker.
During a physical change, a substance changes its appearance but NOT its composition (think of ice melting to form liquid water). In a chemical change, one substance changes into a chemically different substance (think of burning wood to make ashes). In the case of ice, the water can be re-cooled to form ice; in the case of wood, the ash cannot be converted back into wood. When the question asks us what evidence would help us confirm that only a physical change occurred, it is basically asking us to choose the evidence that tells us that nothing has occurred. changed, with respect to KCl. Although color change can be an indicator of a chemical change, the lack of color change is not conclusive enough to indicate that no chemical change has occurred. Dissolution of crystals may be an indication of a chemical change. If there is a change in temperature during the dissolution process, this often indicates that a chemical change occurred. Therefore, the best answer would be. The amount of KCl recovered is exactly the same amount that we started with. Going back to our previous example, after the evaporation of the water, the KCl was able to fully recover its crystalline form. Having 20 g of KCl in the beaker would indicate that none of our KCl was used in any chemical reaction, allowing us to conclude that our change was purely physical.
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