Chemistry, 21.11.2019 10:31 timothytomas2046
Based on reference table i, which change occurs when pellets of solid naoh are added to water and stirred?
(1) the water temperature increases as chemical energy is converted to heat energy.
(2) the water temperature increases as heat energy is stored as chemical energy.
(3) the water temperature decreases as chemical energy is converted to heat energy.
(4) the water temperature decreases as heat energy is stored as chemical energy.
Answers: 2
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In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.
Answers: 2
Based on reference table i, which change occurs when pellets of solid naoh are added to water and st...
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