Homework Answers
1 . On x axis it should be labelled as heat released rather than time. On temperature scale it should be specifically labelled boiling point as 100 deg c and at freezing point as 0 deg c.
2. for part 2b 4.184 joule = 1 cal
so 3340j = 3340/4.184 cal = 798.3 cal
Hope you will like my answer.
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Post lab questions: 1. Draw a cooling curve for water to change the physical state from...
Post lab questions: 1. Draw a cooling curve for water to change the physical state from...
Post lab questions: 1. Draw a cooling curve for water to change the physical state from gaseous phase of water to its solid phase.
Prob. 2: Cooling Curve Circle: Emathermier Exothermis?) Cale, the amount of heat this time in calories...
Prob. 2: Cooling Curve Circle: Emathermier Exothermis?) Cale, the amount of heat this time in calories (cal) - Ilse I cal 4184 for conversions) lost or removed From 1.75 mol water as steam at a convert it to solid ice chilled in a freezer to a temperature of 47.2°C Cumulative Heat Lost To do this, follow the above drawn curve to determine the amount of heat lost for each of the five steps of this process to convert superheated steam...
solve The heat energy associated with a change in temperature that does not involve a change...
solve
The heat energy associated with a change in temperature that does not involve a change in phase is given by -msAT where q is heat in joules, mis mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g·°C). and AT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by where q is heat in joules, m is mass in grams, and ? H...
+ Heating and Cooling Curves Constants Periodic Table Consider heating solid water (ice) until it becomes...
+ Heating and Cooling Curves Constants Periodic Table Consider heating solid water (ice) until it becomes liquid and then gas (steam). (Figure 1) Alternatively consider the reverse process, cooling steam until it becomes water and, finally, ice. (Figure 2) In each case, two types of transitions occur, those involving a temperature change with no change in phase (shown by the diagonal line segments on the graphs) and those at constant temperature with a change in phase (shown by horizontal line...
Experiment 20—Post-Lab Assignment 1. Calculate the total heat, in kj, released when 50.0 grams of water...
Experiment 20—Post-Lab Assignment 1. Calculate the total heat, in kj, released when 50.0 grams of water at 25.0°C is cooled to form ice at -8.0°C. (Hint: it will help to draw out the heating curve of water)
1 Name Lab Section: Date: PreLab: Specific Heat and Heat of Fusion Instructions: Prepare for this lab activity by a...
1 Name Lab Section: Date: PreLab: Specific Heat and Heat of Fusion Instructions: Prepare for this lab activity by answering the questions below. Note that this is a PreLab. It must be turned in at the start of the lab period. Time cannot be given in lab to perform Prelab activities. After the start of lab activities, PreLabs cannot be accepted. Explain your answers. Points will be taken off if your work is not neat and well organized 1. (5...
POST LAB QUESTIONS. 1. If you used more water in your calorimeter, would the observed temperature...
POST LAB QUESTIONS. 1. If you used more water in your calorimeter, would the observed temperature change upon the addition of the hot solid object be larger or smaller than the temperature change you observed? Explain. 2. Your instructor handed you a 1-L sample of a liquid and asked you to determine its specific heat. How would you determine the specific heat of the liquid using the equipment in this lab? 3. What effect would not covering the calorimeter cup...
O GASES, LUIDJA Identifying phase transitions on a heating curve A pure v ample of Substance...
O GASES, LUIDJA Identifying phase transitions on a heating curve A pure v ample of Substance X is put into an evacuated flask. The flask is heated at a ste graph of the results: temperature (°C) heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X? Ilc What phase (physical state) of X would you expect to find in the flask after 10 kJ/mol of heat has been added? (check all that...
1. Calculate the heat required to melt 5.4 g of naphthalene, C.H. AH, -18.8kJ /mol 2....
1. Calculate the heat required to melt 5.4 g of naphthalene, C.H. AH, -18.8kJ /mol 2. Ice at -10.0° C is combined with 50.0g of water at 75.0°C. Calculate the grams of ice present initially if the entire mixture comes to a final temperature of 25.0°C after the ice melts. Specific heat of water is 4.18 J/gºC, AH, = 334J/g Specific heat of water is 4.18 J/gºC, AH, = 3341/8 2. Consider the phase diagram of compound Z below: a....
1. Calculate the enthalpy change, ΔH, for the process in which 31.6 g of water is...
1. Calculate the enthalpy change, ΔH, for the process in which 31.6 g of water is converted from liquid at 0.4 ∘C to vapor at 25.0 ∘C . For water, ΔHvap = 44.0 kJ/mol at 25.0 ∘C and Cs = 4.18 J/(g⋅∘C) for H2O(l). 2. How many grams of ice at -16.2 ∘C can be completely converted to liquid at 10.2 ∘C if the available heat for this process is 4.27×103 kJ ? For ice, use a specific heat of 2.01...
Post lab questions: 1. Draw a cooling curve for water to change the physical state from gaseous phase of water to its solid phase.
Prob. 2: Cooling Curve Circle: Emathermier Exothermis?) Cale, the amount of heat this time in calories (cal) - Ilse I cal 4184 for conversions) lost or removed From 1.75 mol water as steam at a convert it to solid ice chilled in a freezer to a temperature of 47.2°C Cumulative Heat Lost To do this, follow the above drawn curve to determine the amount of heat lost for each of the five steps of this process to convert superheated steam...
solve
The heat energy associated with a change in temperature that does not involve a change in phase is given by -msAT where q is heat in joules, mis mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g·°C). and AT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by where q is heat in joules, m is mass in grams, and ? H...
+ Heating and Cooling Curves Constants Periodic Table Consider heating solid water (ice) until it becomes liquid and then gas (steam). (Figure 1) Alternatively consider the reverse process, cooling steam until it becomes water and, finally, ice. (Figure 2) In each case, two types of transitions occur, those involving a temperature change with no change in phase (shown by the diagonal line segments on the graphs) and those at constant temperature with a change in phase (shown by horizontal line...
Experiment 20—Post-Lab Assignment 1. Calculate the total heat, in kj, released when 50.0 grams of water at 25.0°C is cooled to form ice at -8.0°C. (Hint: it will help to draw out the heating curve of water)
1 Name Lab Section: Date: PreLab: Specific Heat and Heat of Fusion Instructions: Prepare for this lab activity by answering the questions below. Note that this is a PreLab. It must be turned in at the start of the lab period. Time cannot be given in lab to perform Prelab activities. After the start of lab activities, PreLabs cannot be accepted. Explain your answers. Points will be taken off if your work is not neat and well organized 1. (5...
POST LAB QUESTIONS. 1. If you used more water in your calorimeter, would the observed temperature change upon the addition of the hot solid object be larger or smaller than the temperature change you observed? Explain. 2. Your instructor handed you a 1-L sample of a liquid and asked you to determine its specific heat. How would you determine the specific heat of the liquid using the equipment in this lab? 3. What effect would not covering the calorimeter cup...
O GASES, LUIDJA Identifying phase transitions on a heating curve A pure v ample of Substance X is put into an evacuated flask. The flask is heated at a ste graph of the results: temperature (°C) heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X? Ilc What phase (physical state) of X would you expect to find in the flask after 10 kJ/mol of heat has been added? (check all that...
1. Calculate the heat required to melt 5.4 g of naphthalene, C.H. AH, -18.8kJ /mol 2. Ice at -10.0° C is combined with 50.0g of water at 75.0°C. Calculate the grams of ice present initially if the entire mixture comes to a final temperature of 25.0°C after the ice melts. Specific heat of water is 4.18 J/gºC, AH, = 334J/g Specific heat of water is 4.18 J/gºC, AH, = 3341/8 2. Consider the phase diagram of compound Z below: a....
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