a When you press in what is the source of kinetic energy b Is the spring

A when you press in what is the source of kinetic

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a.When you press in, what is the source of kinetic energy? b.Is the spring gaining or losing energy? Is this energy kinetic or potential? c.When the spring is released, what form of energy is released? d. Since energy is “neither created nor destroyed”, think of some forms the energy could have been converted into. Energy Conversions 5. Convert the following information into J units. Remember to show correct sig figs and units in your answers. a. 300. kJ b. 84 kcal c. 120. Cal d. A 5.00g weight moves 1.00 m while experiencing a 9.8 m/s 2 force
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Name: _________________________ Chemistry 1045 Groupwork Set 10 Thermochemistry 6. A bowler lifts a 10. lb bowling ball to a height of 2.0 m and drops it. (Useful information: The force due to gravity is F = m · g, where m = mass of ball, and g = gravitational constant = 9.8 m/s 2 .) a. What happens to the potential energy of the ball as it is raised? b. What quantity of energy, in J, is used to raise the ball? c. If the ball is then dropped, what happens to its energy? d. If all the energy used in part (b) has been converted to kinetic energy by the time the ball hits the ground, determine the ball’s speed just before it hits the ground. e. Assume that there is no friction, and no heat was transferred in these processes. What is the best term for this kind of energy, using the terms contained in this chapter? If you get stuck in this process, refer to pg. 163-164 of the 12 th ed. for guidance. Energy and Work 7.Define: a. E b. Work c. Heat d. Enthalpy
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Name: _________________________ Chemistry 1045 Groupwork Set 10 Thermochemistry 8. Write a phrase in the boxes to describe what it means when that term has the given sign: Term + - E q w 9. Here, we’re going to practice our energy terminology by analogy. Suppose your wallet contains $50. You are at a restaurant, and the bill comes – you owe $20. a.How much money will be transferred between you and the waiter? (Assume the tip was included.) Do you have to include a sign on this value? (Hint – look on a dollar bill to see what sign, if any, is shown.) b.What change has your wallet experienced? Do you need to include a sign to describe this? c.What change has the waiter’s wallet experienced? Do you need to include a sign to describe this? d.In this question, what part is demonstrating (by analogy) q, the quantity of heat energy? e. In this question, what part is demonstrating (by analogy) E system ? f. In this question, what part is demonstrating (by analogy) E surroundings ?
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Name: _________________________ Chemistry 1045 Groupwork Set 10 Thermochemistry 10. If a chemical system releases 200.0 J of heat to its surroundings, and has 100. J of work performed on it, what is the resulting change of energy in the system? Be sure your signs are consistent with the table you generated in part 9 – if not, revise either the table or your answer here. Enthalpies and Reactions
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