// Numbas version: exam_results_page_options
{"name": "Heat of Dissolution 2", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Heat of Dissolution 2", "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": {}, "extensions": [], "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"}], "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/"}]}]}], "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/"}]}