Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance? If the substance is a liquid or solid, an increase in temperature would indicate a chemical change. If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change. If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change. If the substance is a liquid or solid, production of an odor would indicate a chemical change.
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J. j. thomson’s experiment disproved the theory that an atom
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6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.
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The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.
Answers: 1
Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation wou...
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