When two substances are mixed together, a color change is observed. does this mean that a chemical reaction has definitely occurred?
yes because any change indicates a chemical reaction.
no because some physical changes produce color changes.
no because color changes are not indicators of chemical reactions.
yes because color changes occur only when new compounds are formed.
Answers: 2
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Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.
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When two substances are mixed together, a color change is observed. does this mean that a chemical r...
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