// Numbas version: exam_results_page_options
{"name": "Thermochemistry Revision", "metadata": {"description": "Revision of Thermochemistry", "licence": "Creative Commons Attribution 4.0 International"}, "duration": 0, "percentPass": 0, "showQuestionGroupNames": false, "showstudentname": true, "question_groups": [{"name": "Group", "pickingStrategy": "all-ordered", "pickQuestions": 1, "questions": [{"name": "Deirdre's copy of Specific heat capacity: Heat added", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Deirdre Casey", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/681/"}, {"name": "Tom Stallard", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/841/"}], "functions": {"": {"parameters": [], "type": "number", "language": "jme", "definition": ""}}, "advice": "<p>q = m * s.h.c&nbsp;&nbsp;* <span class=\"st\" data-hveid=\"41\">&Delta;</span>T</p>\n<p>Find the heat energy by substituting in&nbsp;$\\var{mass_string}*\\var{SHC_string}*\\var{Temp_diff}$</p>\n<p>Convert this to kJ by dividing by 1000.</p>\n<p></p>", "statement": "<p>How much heat (in kJ) does it take to raise the temperature of a {mass_string} sample of {Mat_string} (with a specific heat capacity of {SHC_string} J g <sup>-1</sup> K <sup>-1</sup>) from {start_temp}&nbsp;<span class=\"_Tgc\">&deg;</span>C to {end_temp} <span class=\"_Tgc\">&deg; </span>C?</p>", "preamble": {"js": "", "css": ""}, "variables": {"Temp_diff": {"description": "", "templateType": "randrange", "name": "Temp_diff", "group": "Ungrouped variables", "definition": "random(10 .. 50#1)"}, "HeatkJ": {"description": "", "templateType": "anything", "name": "HeatkJ", "group": "Ungrouped variables", "definition": "Heat/1000"}, "Mass": {"description": "", "templateType": "anything", "name": "Mass", "group": "mass", "definition": "random(5.00..300.00#1)"}, "materialnum": {"description": "", "templateType": "randrange", "name": "materialnum", "group": "Ungrouped variables", "definition": "random(0 .. 2#1)"}, "Material": {"description": "", "templateType": "anything", "name": "Material", "group": "Ungrouped variables", "definition": "['Water','Silver','Aluminium']"}, "SpecificHeat": {"description": "", "templateType": "anything", "name": "SpecificHeat", "group": "Ungrouped variables", "definition": "[4.184,0.235,0.897]"}, "mass_string": {"description": "", "templateType": "anything", "name": "mass_string", "group": "mass", "definition": "mass+'g'"}, "End_temp": {"description": "", "templateType": "anything", "name": "End_temp", "group": "Ungrouped variables", "definition": "start_temp + temp_diff"}, "Mat_string": {"description": "", "templateType": "anything", "name": "Mat_string", "group": "Ungrouped variables", "definition": "Material[materialnum]"}, "Start_temp": {"description": "", "templateType": "randrange", "name": "Start_temp", "group": "Ungrouped variables", "definition": "random(20 .. 50#1)"}, "SHC_string": {"description": "", "templateType": "anything", "name": "SHC_string", "group": "Ungrouped variables", "definition": "SpecificHeat[materialnum]"}, "Heat": {"description": "", "templateType": "anything", "name": "Heat", "group": "Ungrouped variables", "definition": "SHC_string*mass*temp_diff"}}, "variable_groups": [{"variables": ["Mass", "mass_string"], "name": "mass"}], "parts": [{"mustBeReducedPC": 0, "showCorrectAnswer": true, "mustBeReduced": false, "precisionPartialCredit": 0, "correctAnswerFraction": false, "precision": "3", "precisionMessage": "You have not given your answer to the correct precision.", "variableReplacementStrategy": "originalfirst", "minValue": "HeatkJ", "customMarkingAlgorithm": "mark:\n   apply(validNumber);\n    if(isFraction,\n        apply(cancelled)\n    ,\n        apply(correctPrecision)\n    );\n    switch(\n    studentNumber=precround(heatkJ,studentPrecision),set_credit(1,\"Correct Answer. Well Done!!\"),\n    studentNumber=precround(heat, studentPrecision),set_credit(0.7,\"Almost there, but did you check you have your answer in kJ?\"),\n set_credit(0,\"Incorrect\") \n    )", "variableReplacements": [], "unitTests": [], "scripts": {}, "adaptiveMarkingPenalty": 0, "precisionType": "dp", "extendBaseMarkingAlgorithm": true, "showPrecisionHint": true, "useCustomName": false, "type": "numberentry", "maxValue": "HeatkJ", "showFeedbackIcon": true, "strictPrecision": false, "correctAnswerStyle": "plain", "allowFractions": false, "customName": "", "notationStyles": ["plain", "en", "si-en"], "marks": "10"}], "metadata": {"description": "<p>Use the specific heat capacity of an object and the change in temperature to calculate the heat added to that object.</p><p>Uses Custom marking to allow partial credit for common student errors (mal rules).</p><p><br></p><p>Thermochemistry Revision Sheet Q 5</p>", "licence": "Creative Commons Attribution 4.0 International"}, "ungrouped_variables": ["SpecificHeat", "Material", "materialnum", "Mat_string", "Heat", "SHC_string", "Temp_diff", "Start_temp", "End_temp", "HeatkJ"], "tags": [], "rulesets": {}, "variablesTest": {"condition": "", "maxRuns": "1000"}}, {"name": "Heat of Dissolution 2", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Deirdre Casey", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/681/"}, {"name": "Tom Stallard", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/841/"}], "tags": [], "metadata": {"description": "<p>Question steps student through the process of finding the molar heat of dissolution.</p><p>Adaptive marking and partial credit used</p><p>Thermochemistry Revision Sheet Q3</p>", "licence": "Creative Commons Attribution 4.0 International"}, "statement": "<p style=\"text-align: left;\">When a {mass_string} sample of solid NaOH (40g/mol) dissolves in 100 cm3 of water in a coffee cup calorimeter, the temperature rises from {start_temp}&nbsp;&deg;C&nbsp; to {End_temp}&deg;C.</p>\n<p style=\"text-align: left;\">Assume the density and specific heat capacity of the solution is the same as pure water i.e. 1 g cm-3&nbsp;and 4.184 J g<sup>-1</sup> K<sup>-1</sup> respectively.</p>", "advice": "<p>q = m * s.h.c&nbsp;&nbsp;* <span class=\"st\" data-hveid=\"41\">&Delta;</span>T</p>\n<p>Find the heat energy by substituting in $q=(100+\\var{mass_string})*4.184*(\\var{Start_temp} - \\var{End_temp})$. This is the answer in Joules.</p>\n<p></p>\n<p>You need to convert this to kJ/mol.</p>\n<p></p>\n<p></p>\n<p></p>", "rulesets": {}, "variables": {"Mass": {"name": "Mass", "group": "mass", "definition": "random(4.00..8.00#0.1)", "description": "<p>Mass of NaOH</p>", "templateType": "anything"}, "Start_temp": {"name": "Start_temp", "group": "Ungrouped variables", "definition": "random(20 .. 22#0.1)", "description": "<p>Initial temperature of the water</p>", "templateType": "randrange"}, "End_temp": {"name": "End_temp", "group": "Ungrouped variables", "definition": "random(35.00..38.00#0.1)", "description": "<p>This is the final answer</p>", "templateType": "anything"}, "SpecificHeat": {"name": "SpecificHeat", "group": "Ungrouped variables", "definition": "4.184", "description": "", "templateType": "anything"}, "Mala1": {"name": "Mala1", "group": "Mal rule answers", "definition": "(Mass)*SpecificHeat*(End_temp - Start_temp)", "description": "<p>Error forpart a. The student forgets to use the total mass and instead just uses the smaller</p>", "templateType": "anything"}, "mass_string": {"name": "mass_string", "group": "mass", "definition": "mass+'g'", "description": "", "templateType": "anything"}, "HeatkJ": {"name": "HeatkJ", "group": "Ungrouped variables", "definition": "Heat/1000", "description": "", "templateType": "anything"}, "Heat": {"name": "Heat", "group": "Ungrouped variables", "definition": "(Mass+100)*SpecificHeat*(End_temp - Start_temp)", "description": "<p>Heat energy lost in J</p>", "templateType": "anything"}, "a": {"name": "a", "group": "Ungrouped variables", "definition": "Mass/40", "description": "", "templateType": "anything"}, "HeatkJperMol": {"name": "HeatkJperMol", "group": "Ungrouped variables", "definition": "HeatkJ/a", "description": "", "templateType": "anything"}}, "variablesTest": {"condition": "", "maxRuns": "1000"}, "ungrouped_variables": ["SpecificHeat", "Heat", "Start_temp", "End_temp", "HeatkJ", "a", "HeatkJperMol"], "variable_groups": [{"name": "mass", "variables": ["Mass", "mass_string"]}, {"name": "Mal rule answers", "variables": ["Mala1"]}], "functions": {"": {"parameters": [], "type": "number", "language": "jme", "definition": ""}}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": "10", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "mark:\n   apply(validNumber);\n    if(isFraction,\n        apply(cancelled)\n    ,\n        apply(correctPrecision)\n    );\n    switch(\n    studentNumber= precround(Heat,studentPrecision),set_credit(1,\"Correct well done!\"),\n    studentNumber= precround(mala1,studentPrecision),set_credit(0.5,\"Almost there, but did forget to use the total combined mass?\"),\n set_credit(0,\"Incorrect\") \n    )", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>Calculate the heat of dissolution in J.</p>", "minValue": "Heat", "maxValue": "Heat", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "dp", "precision": "1", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "10", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [{"variable": "Heat", "part": "p0", "must_go_first": true}], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>Convert this to kJ/mol</p>", "minValue": "HeatkJperMol", "maxValue": "HeatkJperMol", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "dp", "precision": "1", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}]}, {"name": "Specific Heat Capacity: Final Temperature", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Deirdre Casey", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/681/"}, {"name": "Tom Stallard", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/841/"}], "tags": [], "metadata": {"description": "<p>Use the specific heat capacity of an object and the heat released to calculate the final temperature.</p><p>Custom marking used to allow for partial credit for common errors (mal rules)</p><p><br></p><p>Thermochemistry Revision Sheet Q7</p>", "licence": "Creative Commons Attribution 4.0 International"}, "statement": "<p style=\"text-align: left;\">If {mass_string} of&nbsp;{Mat_string} at&nbsp;{start_temp}&nbsp;<span class=\"_Tgc\">&deg;</span>C releases&nbsp;{heat}&nbsp;J of heat, calculate the final temperature of the&nbsp;{Mat_string}.</p>\n<p style=\"text-align: left;\">(Specific heat capacity of&nbsp;{Mat_string}&nbsp;{SHC_string} J g<sup>-1</sup>&nbsp;&nbsp;<sup>-1</sup>)</p>\n<p></p>", "advice": "<p>q = m * s.h.c&nbsp;&nbsp;* <span class=\"st\" data-hveid=\"41\">&Delta;</span>T</p>\n<p>Find the heat energy by substituting in&nbsp;$\\var{heat}=\\var{mass_string}*\\var{SHC_string}*(\\var{Start_temp} - final temperature)$</p>\n<p>Transpose this to isolate the final temperature</p>\n<p>Does your answer seem reasonable?</p>\n<p></p>\n<p></p>", "rulesets": {}, "variables": {"Mat_string": {"name": "Mat_string", "group": "Ungrouped variables", "definition": "Material[materialnum]", "description": "", "templateType": "anything"}, "SpecificHeat": {"name": "SpecificHeat", "group": "Ungrouped variables", "definition": "[4.184,0.235,0.897]", "description": "", "templateType": "anything"}, "Material": {"name": "Material", "group": "Ungrouped variables", "definition": "['Water','Silver','Aluminium']", "description": "", "templateType": "anything"}, "Start_temp": {"name": "Start_temp", "group": "Ungrouped variables", "definition": "random(30 .. 40#1)", "description": "", "templateType": "randrange"}, "mal2": {"name": "mal2", "group": "Mal rule answers", "definition": "(Heat)/((Mass)*(SpecificHeat[materialnum])*Start_temp)", "description": "<p>Student error gainig partial credit.</p>\n<p>Student transposes incorrectly.</p>", "templateType": "anything"}, "mal1": {"name": "mal1", "group": "Mal rule answers", "definition": "((Heat - (Mass)*(SpecificHeat[materialnum])*(start_temp)))", "description": "<p>Student error deserving partial credit.</p>\n<p>Student multiplied incorrectly into deltaT therefore oversimplifying</p>", "templateType": "anything"}, "mass_string": {"name": "mass_string", "group": "mass", "definition": "mass+'g'", "description": "", "templateType": "anything"}, "Mass": {"name": "Mass", "group": "mass", "definition": "random(5.00..30.00#1)", "description": "", "templateType": "anything"}, "SHC_string": {"name": "SHC_string", "group": "Ungrouped variables", "definition": "SpecificHeat[materialnum]", "description": "", "templateType": "anything"}, "materialnum": {"name": "materialnum", "group": "Ungrouped variables", "definition": "random(0 .. 2#1)", "description": "", "templateType": "randrange"}, "Heat": {"name": "Heat", "group": "Ungrouped variables", "definition": "random(21.00..23.00#0.1)", "description": "<p>Heat energy lost in J</p>", "templateType": "anything"}, "HeatkJ": {"name": "HeatkJ", "group": "Ungrouped variables", "definition": "Heat/1000", "description": "", "templateType": "anything"}, "End_temp": {"name": "End_temp", "group": "Ungrouped variables", "definition": "((Heat - (Mass)*(SpecificHeat[materialnum])*(start_temp)))/((-1)*(Mass)*(SpecificHeat[materialnum]))", "description": "<p>This is the final answer</p>", "templateType": "anything"}}, "variablesTest": {"condition": "", "maxRuns": "1000"}, "ungrouped_variables": ["SpecificHeat", "Material", "materialnum", "Mat_string", "Heat", "SHC_string", "Start_temp", "End_temp", "HeatkJ"], "variable_groups": [{"name": "mass", "variables": ["Mass", "mass_string"]}, {"name": "Mal rule answers", "variables": ["mal1", "mal2"]}], "functions": {"": {"parameters": [], "type": "number", "language": "jme", "definition": ""}}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": "10", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "mark:\n   apply(validNumber);\n    if(isFraction,\n        apply(cancelled)\n    ,\n        apply(correctPrecision)\n    );\n    switch(\n    studentNumber=precround(End_temp,studentPrecision),set_credit(1,\"Correct Answer. Well Done!!\"),\n    studentNumber=precround(mal1, studentPrecision),set_credit(0.4,\"On the right track but not there yet. Have another look at your deltaT. Did you correctly multiply in?\"),\n    studentNumber=precround(mal2, studentPrecision),set_credit(0.2,\"On the right track but not there yet. Have another look at how you are isolating the final temperature.\"),\n    studentNumber=precround((-1)*mal2, studentPrecision),set_credit(0.2,\"On the right track but not there yet. Have another look at how you are isolating the final temperature.\"),\n  set_credit(0,\"Incorrect\") \n    )", "extendBaseMarkingAlgorithm": true, "unitTests": [], "minValue": "End_temp", "maxValue": "End_temp", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "dp", "precision": "2", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}]}, {"name": "Work done by an ideal gas", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Deirdre Casey", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/681/"}], "metadata": {"licence": "None specified", "description": "<p>Calculating the work done by 1 mole of an ideal gas at constant temperature.</p><p><br></p><p>Q12 from Thermochemistry revision sheet</p>"}, "tags": [], "parts": [{"showFeedbackIcon": true, "minValue": "work", "correctAnswerStyle": "plain", "prompt": "<p>Calculate the work done by the ideal gas. Express your answer in J (1L.atm = 101 J)</p>", "showCorrectAnswer": true, "unitTests": [], "type": "numberentry", "customMarkingAlgorithm": "", "precisionPartialCredit": 0, "precisionType": "dp", "variableReplacements": [], "customName": "", "precision": 0, "correctAnswerFraction": false, "scripts": {}, "maxValue": "work", "variableReplacementStrategy": "originalfirst", "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "adaptiveMarkingPenalty": 0, "marks": 1, "mustBeReducedPC": 0, "mustBeReduced": false, "strictPrecision": true, "precisionMessage": "You have not given your answer to the correct precision.", "extendBaseMarkingAlgorithm": true, "allowFractions": false, "useCustomName": false}], "variablesTest": {"condition": "", "maxRuns": 100}, "functions": {}, "advice": "<p>Use the formula W = -P (delta V)</p>", "variables": {"final_v": {"description": "<p>Final volume in L</p>", "templateType": "randrange", "group": "Ungrouped variables", "definition": "random(40 .. 100#10)", "name": "final_v"}, "initial_v": {"description": "<p>Initial volume in L</p>", "templateType": "randrange", "group": "Ungrouped variables", "definition": "random(10 .. 30#10)", "name": "initial_v"}, "pressure": {"description": "<p>Pressure in atm</p>", "templateType": "randrange", "group": "Ungrouped variables", "definition": "random(0.1 .. 0.4#0.1)", "name": "pressure"}, "work": {"description": "<p>Work done by the ideal gas</p>", "templateType": "anything", "group": "Ungrouped variables", "definition": "(pressure*101)*(final_v - initial_v)", "name": "work"}}, "ungrouped_variables": ["initial_v", "final_v", "pressure", "work"], "variable_groups": [], "statement": "<p>1 mole of an ideal gas expands from a volume of {initial_v} L to one of {final_v}L at a constant temperature of 25<sup>o</sup>&nbsp;C. The expansion is performed against a pressure of {pressure} atm.</p>", "rulesets": {}, "preamble": {"css": "", "js": ""}}]}], "navigation": {"allowregen": true, "reverse": true, "browse": true, "allowsteps": true, "showfrontpage": true, "showresultspage": "oncompletion", "onleave": {"action": "none", "message": ""}, "preventleave": true, "startpassword": ""}, "timing": {"allowPause": true, "timeout": {"action": "none", "message": ""}, "timedwarning": {"action": "none", "message": ""}}, "feedback": {"showactualmark": true, "showtotalmark": true, "showanswerstate": true, "allowrevealanswer": true, "advicethreshold": 0, "intro": "", "feedbackmessages": []}, "contributors": [{"name": "Deirdre Casey", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/681/"}], "extensions": [], "custom_part_types": [], "resources": []}