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You can also find solutions immediately by searching the millions of fully answered study questions in our archive. Magnesium chloride has been converted to magnesium and chlorine.
Iron has been converted to a different substance, rust. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner.
This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. Solution: a Not a chemical change, but a physical change — simply cooling returns the soup to its original form. There has been no change in composition, thus this is a physical change, and not a chemical change.
If there is a chemical change, in which the composition of the substance has been altered, the process cannot be reversed by changing the temperature.
Solution: a and c can be reversed with temperature; the dew can evaporate and the ice cream can be refrozen. Solution: a The exhaust is lower in energy than the fuel by an amount of energy equal to that released as the fuel burns. The fuel has a higher potential energy.
Solution: a The sled sliding down the hill has higher kinetic energy than the unmoving sled. The first observation is that the toast has not popped out of the toaster.
The next step is a hypothesis tentative explanation to explain the observation. The hypothesis is that the spring mechanism is stuck. Next, there will be a test of the hypothesis. In this case, the test is an additional observation — the bread is unchanged.
This observation leads to a new hypothesis — the toaster is unplugged. This hypothesis leads to additional tests — seeing if the toaster is plugged in, and if it works when plugged into a different outlet. The final test on the toaster leads to a new hypothesis — there is a problem with the power in the kitchen.
This hypothesis leads to the final test concerning the light in the kitchen. A qualitative observation may be subjective and open to interpretation.
When has the sun completely risen? Measuring the fraction of the ice above or below the surface would make this a quantitative measurement. The model is improved by further experiments. It should be flexible enough to allow for modifications as additional experimental results are gathered. The unit desired inches must be in the numerator.