Chemistry, 30.03.2021 20:10 necolewiggins3083
A student has a petri dish and several marbles. Which of the following activities should the student perform to demonstrate phase transition from a liquid to solid?
A. Placing a few marbles in the petri dish and shaking them vigorously to represent removal of energy
B. Packing the petri dish with two layers of marbles and slowly jiggling them to represent removal of energy
C. Packing the petri dish with two layers of marbles and slowly jiggling them to represent addition of energy
D. Placing a few marbles in the petri dish and shaking them vigorously to represent addition of energy
Answers: 2
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What effect does nuclear radiation have on atoms?
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For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)
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As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave
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The biosphere of the earth is made up of . a. inorganic b. organic
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A student has a petri dish and several marbles. Which of the following activities should the student...
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