When a 0.69-g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 390 g of water from 22.7∘C to 35.3 ∘C.
What is the energy value for the olive oil in kcal/g?
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A piece of iron was heated to 95.4C and dropped into a constant-pressure calorimeter containing 284 g of water at 32.2C. The final temperature of the water and iron was 51.9C. Assuming that the calorimeter itself absorbs a negligible amount of heat, what was the mass (in grams) of the piece of iron? The specific heat of iron is 0.449 J/(gC), and the specific heat of water is 4.18 J/(gC).
A 45-g aluminum spoon (specific heat 0.88 J/g C) at 24 C is placed in 180 mL (180 g) of coffee at 85 C and the temperature of the two become equal. (a) What is the final temperature when the two become equal? Assume that coffee has the same specific heat as water. (b) The first time a student solved this problem she got an answer of 88 C. Explain why this is clearly an incorrect answer.
As a child plays on a swing, at what point in her movement is her kinetic energy the greatest? At what point is potential energy at its maximum?
9.33 Copper wires used to transport electrical current heat up because of the resistance of the wire. If a 140-g wire gains 280 J of heat, what is the change in temperature in the wire? Copper has a specific heat of 0.384Jg1C1 .
Which of the following is an endothermic process? combustion of gasoline in a car engine i>sublimation of carbon dioxide: water condensing on a cold pipe freezing juice to make popsicles
Methane, CH4, is a major component of marsh gas. When 0.5000 mol methane burns to produce carbon dioxide and liquid water, 445.1 kJ of heat is released. What is this heat in kilocalories?
On a cold day, you can warm your hands with a heat pad, a device that uses the oxidation of iron to produce energy as heat. 4 Fe(s) + 3 O2(g) 2 Fe2O3(s) A hand warmer uses the oxidation of iron as a source of thermal energy. What mass of iron is needed to supply the energy required to warm 15 mL of water (d = 1.00 g/mL) from 23 C to 37 C?
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