Quiz — Pressions partielles.pdf

Question 1 sur 10 20:00

[{"id":6589,"question":"Quelle est l'unité de la pression partielle dans le système international ?","option_a":"Pascal (Pa)","option_b":"Atmosphère (atm)","option_c":"Bar (bar)","option_d":"Millimètre de mercure (mmHg)","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'unité SI de la pression est le Pascal (Pa).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Pascal (Pa)\", \"b\": \"Atmosphère (atm)\", \"c\": \"Bar (bar)\", \"d\": \"M","_debug_options_count":4},{"id":6590,"question":"La loi de Dalton stipule que la pression totale d'un mélange gazeux est égale à la somme des pressions partielles.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La loi de Dalton est définie par \u003Cem\u003EP\u003Csub\u003Etotale\u003C\/sub\u003E = Σ P\u003Csub\u003Ei\u003C\/sub\u003E\u003C\/em\u003E.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":6591,"question":"Si un mélange gazeux contient 20% de gaz A et 80% de gaz B, quelle est la pression partielle de B si la pression totale est de 100 kPa ?","option_a":"20 kPa","option_b":"80 kPa","option_c":"100 kPa","option_d":"120 kPa","option_e":"","option_f":"","bonne_reponse":"b","explication":"La pression partielle de B = fraction molaire × pression totale = 0.8 × 100 kPa = 80 kPa.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"20 kPa\", \"b\": \"80 kPa\", \"c\": \"100 kPa\", \"d\": \"120 kPa\"}}","_debug_options_count":4},{"id":6592,"question":"La pression partielle d'un gaz dépend de :","option_a":"Sa masse molaire","option_b":"Sa fraction molaire","option_c":"Sa température de fusion","option_d":"Son volume molaire","option_e":"","option_f":"","bonne_reponse":"b","explication":"La pression partielle dépend de la fraction molaire du gaz dans le mélange.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Sa masse molaire\", \"b\": \"Sa fraction molaire\", \"c\": \"Sa températ","_debug_options_count":4},{"id":6593,"question":"Dans un mélange de gaz parfaits, les pressions partielles sont proportionnelles aux nombres de moles de chaque gaz.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Les pressions partielles sont proportionnelles aux fractions molaires, donc aux nombres de moles.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":6594,"question":"Quelle formule relie la pression partielle d'un gaz à sa fraction molaire ?","option_a":"P\u003Csub\u003Ei\u003C\/sub\u003E = x\u003Csub\u003Ei\u003C\/sub\u003E \/ P\u003Csub\u003Etotale\u003C\/sub\u003E","option_b":"P\u003Csub\u003Ei\u003C\/sub\u003E = x\u003Csub\u003Ei\u003C\/sub\u003E × P\u003Csub\u003Etotale\u003C\/sub\u003E","option_c":"P\u003Csub\u003Ei\u003C\/sub\u003E = P\u003Csub\u003Etotale\u003C\/sub\u003E \/ x\u003Csub\u003Ei\u003C\/sub\u003E","option_d":"P\u003Csub\u003Ei\u003C\/sub\u003E = x\u003Csub\u003Ei\u003C\/sub\u003E + P\u003Csub\u003Etotale\u003C\/sub\u003E","option_e":"","option_f":"","bonne_reponse":"b","explication":"La formule est \u003Cem\u003EP\u003Csub\u003Ei\u003C\/sub\u003E = x\u003Csub\u003Ei\u003C\/sub\u003E × P\u003Csub\u003Etotale\u003C\/sub\u003E\u003C\/em\u003E, où \u003Cem\u003Ex\u003Csub\u003Ei\u003C\/sub\u003E\u003C\/em\u003E est la fraction molaire.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"P\u003Csub\u003Ei\u003C\/sub\u003E = x\u003Csub\u003Ei\u003C\/sub\u003E \/ P\u003Csub\u003Etotale\u003C\/sub\u003E\", \"b\": \"P\u003Csub\u003E","_debug_options_count":4},{"id":6595,"question":"Un mélange gazeux contient 3 gaz : A (30%), B (50%), C (20%). Si la pression totale est de 2 atm, quelle est la pression partielle de C ?","option_a":"0.2 atm","option_b":"0.4 atm","option_c":"0.6 atm","option_d":"0.8 atm","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pression partielle de C = 0.2 × 2 atm = 0.4 atm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"0.2 atm\", \"b\": \"0.4 atm\", \"c\": \"0.6 atm\", \"d\": \"0.8 atm\"}}","_debug_options_count":4},{"id":6596,"question":"La loi de Dalton ne s'applique pas aux gaz réels à haute pression.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Les gaz réels s'écartent de l'idéalité à haute pression, donc la loi de Dalton est une approximation.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":6597,"question":"Si la pression partielle d'un gaz augmente, que peut-on dire de sa fraction molaire ?","option_a":"Elle diminue","option_b":"Elle reste constante","option_c":"Elle augmente","option_d":"Elle est divisée par 2","option_e":"","option_f":"","bonne_reponse":"c","explication":"Si la pression totale est constante, une augmentation de la pression partielle implique une augmentation de la fraction molaire.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Elle diminue\", \"b\": \"Elle reste constante\", \"c\": \"Elle augmente\",","_debug_options_count":4},{"id":6598,"question":"Quelle grandeur physique est égale à la pression partielle d'un gaz dans un mélange idéal ?","option_a":"La pression osmotique","option_b":"La pression de vapeur saturante","option_c":"La pression exercée par ce gaz seul dans le même volume","option_d":"La pression atmosphérique","option_e":"","option_f":"","bonne_reponse":"c","explication":"La pression partielle est la pression qu'exercerait le gaz s'il occupait seul le volume du mélange.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"La pression osmotique\", \"b\": \"La pression de vapeur saturante\", \"","_debug_options_count":4}]