Answer all the questions in complete sentences. Label all graphs and for any math problem show given, required and then your solutions. Be careful of units!
1. Define system and surrounding. How does heat transfer inside a glass of lemonade with ice cubes in it? Draw a picture. 2. What are exothermic and endothermic reactions? How can you remember which way the energy flows through the word roots? 3. What is enthalpy? What is the sign convention for enthalpy? 4. What is thermochemistry a study of? 5. Explain if the following are endothermic or exothermic processes. Describe which way the energy flows in terms of system and surrounding.
6. State the second law of thermodynamics in two different ways! ( In terms of heat flow and entropy). 7. Calculate the specific heat of Iron when a sample weighing 38 g absorbed 500 J of total thermal energy with a corresponding temperature increase of 29.3 degrees Celsius. 8. A catalyzed decomposition of Hydrogen peroxide into water and oxygen produces a hot foam. Is the chemical reaction exothermic or endothermic? 9. What is a reversible reaction? Write down the equation for the Haber Process for manufacturing Ammonia. Is the reaction exothermic or endothermic? Draw and label an energy diagram. 10. Define specific heat. Why do we multiply it by mass and temp. Change to get total heat ?
0 Comments
1. The driving force behind plate tectonic movement that cause volcanoes to erupt is
2. Which of the following is NOT a source of thermal energy (heat) inside the Earth? 3. What is specific heat? 4. This picture illustrates a major source of heat inside of the Earth. Identify the source. 5. Identify the hottest layer of Earth's interior. 6. What happens to the movement of material when the heat is turned off? 7. Why does hot material rise creating convection currents? 8. Material that cools becomes more dense and 9. According to the second law, how does heat flow? 10. What happens to energy transfer at thermal equilibrium? 11. Calculate Specific ht of Plutonium. Mass of sample is 50 g, total heat 450 J , temp. diff 70°C 12. Cu has sp. heat 0.384 J/ g°C. What is temp change when a sample of 50 g has total heat 250 J ? 13. How are the variables related in the equation? 14. Convert 100°C to Farenheit 15. Water has a very high specific heat compared to sand. During the day, which would be hotter? 16. Specific heat data in J/g °C: Brass = 0.402, Copper = 0.377 and Iron = 0.460. Which is correct? 17. Convert 1050 °C to Farenheit 1. If q=mc∆T, what would the formula be if you needed to solve for specific heat (c)?
2. If q=mc∆T, what would the formula be if you needed to solve for mass (m)? 3. If q=mc∆T, what would the formula be if you needed to solve for change in temperature (∆T)? 4. If q=mc∆T, what would the formula be if you needed to solve for the final temperature (TF)? ∆T is the same as (TF - Ti) 5. If q=mc∆T, what would the formula be if you needed to solve for the initial temperature (Ti)? ∆T is the same as (TF - Ti) 6. 100.0 mL of 4.0°C water is heated until its temperature is 37°C. If the specific heat of water is 4.18 J/g°C, calculate the amount of heat energy needed to cause this rise in temperature. 7. 25.0 g of mercury is heated from 25°C to 155°C, and absorbs 455 joules of heat in the process. Calculate the specific heat capacity of mercury. HEAT Practice Problems Q = m x C x ∆T
|
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
October 2017
Categories |