// Numbas version: exam_results_page_options
{"name": "Heating/Phase Change", "extensions": ["jsxgraph"], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"metadata": {"licence": "Creative Commons Attribution 4.0 International", "description": "A random heating question, that randomly picks a material, and then heats it through either one or two phase changes, provides an example graph of the heating with scaled temperature ranges (though not with scaled latent and specific heats), and a table with the suitable constants.
"}, "advice": "{advice1}
\n{advice2}
\n{advice3}
\n{advice4}
\n{advice5}
\n\nTotal Heat:
\n{totalheat} J = {sigformat(totalheat/1000000,3)} MJ
", "preamble": {"css": "", "js": ""}, "ungrouped_variables": [], "statement": "{mass_string} of {Mat_string} is heated from {st_string} to {et_string}, changing in temperature and phase.
\n\n{if(switcharoo=1,twostep(),onestep())}
\n\n\n\n | \nSolid specific heat | \nLatent Heat of fusion | \nLiquid specific heat | \nLatent Heat of vapourisation | \nGaseous specific heat | \nFusion Temperature | \nVaporisation Temperature | \n
\n\n| {Mat_string} | \n{solid_heatcap} JK<sup>-1</sup>kg<sup>-1</sup> | \n{phase1_latentheat} Jkg<sup>-1</sup> | \n{liquid_heatcap} JK<sup>-1</sup>kg<sup>-1</sup> | \n{phase2_latentheat} Jkg<sup>-1</sup> | \n{gas_heatcap} JK<sup>-1</sup>kg<sup>-1</sup> | \n{phase1_temp} K | \n{phase2_temp} K | \n
\n\n
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manipulate elements\nvar board = div.board;\n\n\n\n// create the x-axis.\n//var xaxis = board.create('line',[[0,0],[1,0]], {strokeColor: 'black', fixed: true});\n//var xticks = board.create('ticks',[xaxis,20],{\n// drawLabels: true,\n// minorTicks: 0\n//});\n\n// create the y-axis\n\nvar yaxis = board.create('line',[[0,0],[0,1]], { strokeColor: 'black', fixed: true });\nvar yticks = board.create('ticks',[yaxis,parseInt((et-st)/50.)*10],{\ndrawZero:true,\ndrawLabels: true,\nlabel: {offset: [20, 0]},\nminorTicks: 0\n});\n\n\n// full size of the five slopes\nvar allslope=(et-st);\nvar s1sz=(8*(pt1-st)/allslope);\nvar s3sz=(8*(pt2-pt1)/allslope);\nvar s5sz=(8*(et-pt2)/allslope);\n\n\n//\n//slope 1\nvar slope1 = board.create('line',[[4,st],[s1sz+4,pt1]], {straightFirst:false, straightLast:false, strokeColor: 'black', fixed: true });\nvar slope2 = board.create('line',[[s1sz+4,pt1],[s1sz+8,pt1]], {straightFirst:false, straightLast:false, strokeColor: 'black', fixed: true });\nvar slope3 = 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board.create('text',[-2,(et+st)/2,k_c_str]);\n\n\n// and return the container div\nreturn div;", "parameters": [], "language": "javascript"}}, "tags": [], "name": "Heating/Phase Change", "variable_groups": [{"name": "switcharoo (phase type) values", "variables": ["switcharoo_comment", "switcharoo_type", "phase_temp", "phase_latentheat"]}, {"name": "kg or g", "variables": ["mass_string"]}, {"name": "Material values", "variables": ["mat_string", "phase1_temp", "phase2_temp", "gas_heatcap", "phase1_latentheat", "liquid_heatcap", "phase2_latentheat", "solid_heatcap"]}, {"name": "Energy", "variables": ["solidheat", "fusionheat", "liquidheat", "vapourheat", "gasheat", "totalheat", "totalheat_m"]}, {"name": "K or C", "variables": ["st_string", "et_string"]}, {"name": "Lists of values", "variables": ["material_list", "solid_hc_list", "liquid_hc_list", "gas_hc_list", "fusion_lh_list", "vapour_lh_list", "fusion_temp_list", "vapour_temp_list"]}, {"name": "Random variables", "variables": ["switcharoo", "wat_mat", "start_temp", "end_temp", "k_c_switch", "mass"]}, {"name": "advice", "variables": ["advice1", "advice2", "advice3", "advice4", "advice5"]}], "variablesTest": {"maxRuns": 100, "condition": ""}, "variables": {"mat_string": {"name": "mat_string", "group": "Material values", "templateType": "anything", "description": "", "definition": "material_list[wat_mat]"}, "switcharoo_comment": {"name": "switcharoo_comment", "group": "switcharoo (phase type) values", "templateType": "list of strings", "description": "", "definition": "[ safe(\"solid_to_liquid\"), safe(\"solid_to_gas\"), safe(\"liquid_to_gas\") ]"}, "advice1": {"name": "advice1", "group": "advice", "templateType": "anything", "description": "", "definition": "if(switcharoo=2,\" \",\"Heating the solid: $Q = m \\\\times C_S \\\\times \\\\Delta T = \"+mass+\" \\\\times \"+solid_heatcap+\" \\\\times (\"+phase1_temp+\"-\"+start_temp+\") = \"+solidheat+\" J $\")"}, "vapourheat": {"name": "vapourheat", "group": "Energy", "templateType": "anything", "description": "", "definition": "siground(if(switcharoo>0,mass*phase2_latentheat,0),6)"}, "phase_temp": {"name": "phase_temp", "group": "switcharoo (phase type) values", "templateType": "anything", "description": "", "definition": "switch(switcharoo=0,phase1_temp,switcharoo=2,phase2_temp,0)"}, "phase2_temp": {"name": "phase2_temp", "group": "Material values", "templateType": "anything", "description": "", "definition": "vapour_temp_list[wat_mat]"}, "liquid_hc_list": {"name": "liquid_hc_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[4200,140,490,150]"}, "solid_hc_list": {"name": "solid_hc_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[2100,110,390,130]"}, "switcharoo_type": {"name": "switcharoo_type", "group": "switcharoo (phase type) values", "templateType": "anything", "description": "", "definition": "switcharoo_comment[switcharoo]"}, "advice5": {"name": "advice5", "group": "advice", "templateType": "anything", "description": "", "definition": "if(switcharoo=0,\" \",\"Heating the gas: $Q = m \\\\times C_G \\\\times \\\\Delta T = \"+mass+\" \\\\times \"+gas_heatcap+\" (\"+end_temp+\"-\"+phase2_temp+\") = \"+gasheat+\" J$\")"}, "end_temp": {"name": "end_temp", "group": "Random variables", "templateType": "anything", "description": "", "definition": "if(switcharoo>0,random(phase2_temp+10..phase2_temp+100),random(phase1_temp+10..phase2_temp-10))"}, "fusionheat": {"name": "fusionheat", "group": "Energy", "templateType": "anything", "description": "", "definition": "siground(if(switcharoo<2,mass*phase1_latentheat,0),6)"}, "totalheat": {"name": "totalheat", "group": "Energy", "templateType": "anything", "description": "", "definition": "solidheat+fusionheat+liquidheat+vapourheat+gasheat"}, "et_string": {"name": "et_string", "group": "K or C", "templateType": "anything", "description": "", "definition": "if(k_c_switch,end_temp+' K',(end_temp-273)+' \u00b0C') "}, "material_list": {"name": "material_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "['H2O','Mercury','Copper','Gold']"}, "wat_mat": {"name": "wat_mat", "group": "Random variables", "templateType": "anything", "description": "", "definition": "random(0..3)"}, "k_c_switch": {"name": "k_c_switch", "group": "Random variables", "templateType": "anything", "description": "", "definition": "random(0,1)"}, "phase2_latentheat": {"name": "phase2_latentheat", "group": "Material values", "templateType": "anything", "description": "", "definition": "vapour_lh_list[wat_mat]"}, "advice2": {"name": "advice2", "group": "advice", "templateType": "anything", "description": "", "definition": "if(switcharoo=2,\" \",\"Melting the \"+Mat_string+\": $Q = m \\\\times L_H = \"+mass+\" \\\\times \"+phase1_latentheat+\" = \"+fusionheat+\" J$\")"}, "mass_string": {"name": "mass_string", "group": "kg or g", "templateType": "anything", "description": "", "definition": "if(mass<1,dpformat(mass*1000,0)+' g',dpformat(mass,2)+' kg')"}, "phase1_latentheat": {"name": "phase1_latentheat", "group": "Material values", "templateType": "anything", "description": "", "definition": "fusion_lh_list[wat_mat]"}, "vapour_lh_list": {"name": "vapour_lh_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[2260000,293000,4730000,1580000]"}, "solidheat": {"name": "solidheat", "group": "Energy", "templateType": "anything", "description": "", "definition": "siground(if(switcharoo<2,mass*solid_heatcap*(phase1_temp-start_temp),0),6)"}, "switcharoo": {"name": "switcharoo", "group": "Random variables", "templateType": "anything", "description": "", "definition": "random(0..2)"}, "start_temp": {"name": "start_temp", "group": "Random variables", "templateType": "anything", "description": "", "definition": "if(switcharoo<2,random(100..phase1_temp-10),random(phase1_temp+10..phase2_temp-10))"}, "solid_heatcap": {"name": "solid_heatcap", "group": "Material values", "templateType": "anything", "description": "", "definition": "solid_hc_list[wat_mat]"}, "fusion_lh_list": {"name": "fusion_lh_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[336000,11300,207000,63000]"}, "phase1_temp": {"name": "phase1_temp", "group": "Material values", "templateType": "anything", "description": "", "definition": "fusion_temp_list[wat_mat]"}, "gas_hc_list": {"name": "gas_hc_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[2000,135,350,110]"}, "st_string": {"name": "st_string", "group": "K or C", "templateType": "anything", "description": "", "definition": "if(k_c_switch,start_temp+' K',(start_temp-273)+' \u00b0C') "}, "fusion_temp_list": {"name": "fusion_temp_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[273,234,1357,1337]"}, "gas_heatcap": {"name": "gas_heatcap", "group": "Material values", "templateType": "anything", "description": "", "definition": "gas_hc_list[wat_mat]"}, "mass": {"name": "mass", "group": "Random variables", "templateType": "anything", "description": "", "definition": "siground(if(random(0,1)=0,random(0.01..0.99#0.01),random(1.00..10.00#0.01)),3)"}, "phase_latentheat": {"name": "phase_latentheat", "group": "switcharoo (phase type) values", "templateType": "anything", "description": "", "definition": "switch(switcharoo=0,phase1_latentheat,switcharoo=2,phase2_latentheat,0)"}, "liquid_heatcap": {"name": "liquid_heatcap", "group": "Material values", "templateType": "anything", "description": "", "definition": "liquid_hc_list[wat_mat]"}, "vapour_temp_list": {"name": "vapour_temp_list", "group": "Lists of values", "templateType": "anything", "description": "", "definition": "[373,630,2835,3243]"}, "totalheat_m": {"name": "totalheat_m", "group": "Energy", "templateType": "anything", "description": "", "definition": "totalheat/10^6"}, "gasheat": {"name": "gasheat", "group": "Energy", "templateType": "anything", "description": "", "definition": "siground(if(switcharoo>0,mass*gas_heatcap*(end_temp-phase2_temp),0),6)"}, "advice4": {"name": "advice4", "group": "advice", "templateType": "anything", "description": "", "definition": "if(switcharoo=0,\" \",\"Vaporising the \"+Mat_string+\": $Q = m \\\\times L_H = \"+mass+\" \\\\times \"+phase2_latentheat+\" = \"+vapourheat+\" J$\")"}, "liquidheat": {"name": "liquidheat", "group": "Energy", "templateType": "anything", "description": "", "definition": "siground(switch(switcharoo=0,mass*liquid_heatcap*(end_temp-phase1_temp),switcharoo=1,mass*liquid_heatcap*(phase2_temp-phase1_temp),switcharoo=2,mass*liquid_heatcap*(phase2_temp-start_temp),0),6)"}, "advice3": {"name": "advice3", "group": "advice", "templateType": "anything", "description": "", "definition": 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", "Liquid, Gas
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", "displayType": "radiogroup", "marks": 0, "showFeedbackIcon": true, "distractors": ["", "", ""], "customMarkingAlgorithm": "", "showCorrectAnswer": true, "displayColumns": 0}, {"choices": ["Melting
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", "displayType": "radiogroup", "marks": 0, "showFeedbackIcon": true, "distractors": ["", "", ""], "customMarkingAlgorithm": "", "showCorrectAnswer": true, "displayColumns": 0}, {"customName": "", "mustBeReducedPC": 0, "precision": "3", "scripts": {}, "showPrecisionHint": false, "correctAnswerFraction": false, "precisionType": "sigfig", "unitTests": [], "correctAnswerStyle": "plain", "variableReplacementStrategy": "originalfirst", "strictPrecision": true, "type": "numberentry", "variableReplacements": [], "useCustomName": false, "mustBeReduced": false, "precisionPartialCredit": 0, "extendBaseMarkingAlgorithm": true, "allowFractions": false, "notationStyles": ["plain", "en", "si-en"], "prompt": "Calculate the total heat absorbed by the {Mat_string} through this process in MJ to three significant figures.
", "marks": "1", "showFeedbackIcon": true, "precisionMessage": "You have not given your answer to the correct precision.", "customMarkingAlgorithm": "", "maxValue": "siground(totalheat_m,3)+siground(abs(totalheat_m/100),3)", "showCorrectAnswer": false, "minValue": "siground(totalheat_m,3)-siground(abs(totalheat_m/100),3)"}], "contributors": [{"name": "Tom Stallard", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/841/"}, {"name": "Melissa D'Ascenzio", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/873/"}]}]}], "contributors": [{"name": "Tom Stallard", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/841/"}, {"name": "Melissa D'Ascenzio", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/873/"}]}