Question

1. Identify each of the following types of energy as either potential energy or kinetic energy (6 Points) a. Thermal Energy Kinetic Energy b. Chemical Energy Potential Energy c. Gravitational Energy Potinhal Entry 2. The Si Unit for energy is the Joule which is represented with the symbol J . 4.184 of these are equal to one kilocaloric (3 Points) 3. Based on the formula w = P x AV, if a gas inside a cylinder is compressed, is the work term for the system negative or positive? (2 Points) 4. What is meant by the term state function? (2 points) 5. Specify which of the following are state functions. (Circle all that apply (4 Points) Work Enthalpy Internal Energy Volume 6. Which of the following is NOT a postulate of the kinetic molecular theory of gases? (2 Points) a. The distance between gas molecules is large in comparison to their size. b. The average speed of gas molecules is inversely proportional to temperature. C. Gas molecules are in constant, random motion. d. At a given temperature, all gases have the same average kinetic energy. 7. Using a bomb calorimeter to determine energy changes is an example of constant calorimetry, while using a coffee cup would be an example of constant _calorimetry. (4 Points) 8. What is the enthalpy change when 34.0 grams of NH3 (molar mass = 17.0 g/mol) are formed by the following reaction? (6 Points) N218 + 3H2 → 2NH3 te AH = -92.2 kJ ON H OME 9. Calculate the amount of heat (in J) required to raise the temperature of 38 g of iron from 26°C to 98*C. The specific heat capacity of iron is 0.45J/gºC. (6 Points) 10. The initial temperature of a 22-g sample of copper is 25°C. If the sample absorbs 236) of heat, what is the final temperature? The specific heat of copper is 0.39 J/gºC. (4 Points)

I really need help understanding these questions. I am not good when it come to science(chemistry). but, I love math. I really need help, can you please show step.

needed help with 8 only

Answer 1

N2 (9) + 3H2(g) - 2NH3(g), AH = -92.2 KJ It means that I mole of Na (9) released -92.2 kJ of heat. as we can say for the formation of a mole of NH3, energy released - 92 We have 34.0 - 2 mole. Amount of NH3 = 34.0 gm Molar mans of NH3 = 17 gmot! u No. of moles of NH3 = gm wt Molar man 17.0 since by calculating we are getting only a mote. The chemical egy also showing the formation of a mole of NH3 : oh would be the same. :. Amount of heat mashined released : -92.2 KJ.

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