This lab question is: How can you distinguish a physical change from a chemical change?
Which statements below are an appropriate hypothesis in response to this question? Check all that apply.
If a substance changes state of matter (e. g., liquid to gas), then this is a physical change because the
original properties of the substance have not changed.
If a substance undergoes a physical change, then it will retain most of its original properties because
no new substance is formed.
If a substance undergoes a chemical change, then it will not retain its original properties because a
new substance is formed.
If a precipitate is formed when two substances are mixed, then a chemical change has taken place
because precipitates are new substances.
Answers: 2
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A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?
Answers: 1
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Table sugar completely dissolved in water is an example of a?
Answers: 1
This lab question is: How can you distinguish a physical change from a chemical change?
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