We get energy from fooa to do what we need to everyday Why is digesting fooda chemicalchange?2.Digesting is a reversible processb.Digesting lets our food keep its propertiesC.Digesting changes the properties of our food to have different or new propertiesd.Digesting oniy changes the size ot our foodReasoning (expiain your answer using science facts)2 Kristine baked a cake Which represents a physical change that happened when she made thecake?a.She cut the cake in equab.She baked the cake in tC.She let the cake burn

Digestion is a chemical change as it involves changes in the composition of the food going through…

Answered: We get energy from food to do what we…

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1 kg of boiling water at a temperature of 109.3 degrees Celsius. The pressure is then doubled and the water evaporates at this new pressure to a degree of drought 0.9. By using a steam table. Determine: A. Pressure where evaporation B. The amount of heat that must be added before evaporation starts at a new temperature C. Wet steam enthalpy D. Wet steam entropy E. Wet vapor volume Note : picture 1 is pressure table, picture 2 is temperature table.
8.A car engine with engine efficiency 40% burns gasoline and does 500 Joule work to drive the car. How much heat (in Joule) is produced from gasoline burning (hot source)? 9.The specific heat of water is 1.0 cal/gram oC. 100 gram hot water at 100 oC is mixed with 300 gram cold water at 20 oC. What is the final equilibrium temperature (in oC) of the mixed water? answer both question han raing helpful oher vise un helpful
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CONCEPTUAL QUESTIONS ON 2ND LAW OF THERMODYNAMICS (10 points) 1. Is a temperature difference necessary to operate a heat engine? State why or why not. 2. Definitions of efficiency vary depending on how energy is being converted. Compare the definitions of efficiency for the human body and heat engines. How does the definition of efficiency in each relate to the type of energy being converted into doing work? 3. Why-other than the fact that the second law of thermodynamics says reversible engines are the most efficient-should heat engines employing reversible processes be more efficient than those employing irreversible processes? Consider that dissipative mechanisms are one cause of irreversibility. PRACTICE PROBLEMS (20 points) 1. (a) What is the efficiency of a cyclical heat engine in which 75.0 kJ of heat transfer occurs to the environment for every 95.0 kJ of heat transfer into the engine? (b) How much work does it produce for 100 kJ of heat transfer into the engine? 2. The engine…
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