Quiz — Chimie .cont.pdf

Question 1 sur 10 20:00

[{"id":78531,"question":"Quel est le coefficient de O₂ dans l'équation équilibrée suivante : 2 C₄H₁₀ + x O₂ → 8 CO₂ + 10 H₂O ?","option_a":"13","option_b":"10","option_c":"8","option_d":"5","option_e":"","option_f":"","bonne_reponse":"a","explication":"En équilibrant l'équation, on trouve x = 13 pour respecter la conservation de l'oxygène.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"13\", \"b\": \"10\", \"c\": \"8\", \"d\": \"5\"}}","_debug_options_count":4},{"id":78532,"question":"Dans la réaction 2H₂ + O₂ → 2H₂O, les produits sont :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Les produits sont bien H₂O (eau), donc la réponse est Vrai.","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":78533,"question":"Quelle est la masse molaire du dioxyde de carbone (CO₂) ?","option_a":"44 g\/mol","option_b":"28 g\/mol","option_c":"18 g\/mol","option_d":"12 g\/mol","option_e":"","option_f":"","bonne_reponse":"a","explication":"La masse molaire de CO₂ est 12 (C) + 2×16 (O) = 44 g\/mol.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"44 g\/mol\", \"b\": \"28 g\/mol\", \"c\": \"18 g\/mol\", \"d\": \"12 g\/mol\"}}","_debug_options_count":4},{"id":78534,"question":"Si 2 moles de H₂ réagissent avec 1 mole de O₂, combien de moles de H₂O sont produites ?","option_a":"1 mole","option_b":"2 moles","option_c":"3 moles","option_d":"4 moles","option_e":"","option_f":"","bonne_reponse":"b","explication":"D'après l'équation équilibrée, 2H₂ + O₂ → 2H₂O, donc 2 moles de H₂ produisent 2 moles de H₂O.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"1 mole\", \"b\": \"2 moles\", \"c\": \"3 moles\", \"d\": \"4 moles\"}}","_debug_options_count":4},{"id":78535,"question":"La réaction Zn + 2HCl → ZnCl₂ + H₂ est-elle équilibrée ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'équation est équilibrée : 1 Zn, 2 H et 2 Cl de chaque côté.","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":78536,"question":"Quel est le nombre d'atomes de carbone dans 3 moles de C₆H₁₂O₆ ?","option_a":"18 atomes","option_b":"108 atomes","option_c":"18 moles","option_d":"36 atomes","option_e":"","option_f":"","bonne_reponse":"b","explication":"Chaque molécule de C₆H₁₂O₆ contient 6 atomes de carbone. Pour 3 moles, cela fait 3 × 6 × Nₐ atomes.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"18 atomes\", \"b\": \"108 atomes\", \"c\": \"18 moles\", \"d\": \"36 atomes\"}","_debug_options_count":4},{"id":78537,"question":"Dans la réaction 2Na + Cl₂ → 2NaCl, quel est le réactif limitant si on a 3 moles de Na et 2 moles de Cl₂ ?","option_a":"Na","option_b":"Cl₂","option_c":"NaCl","option_d":"Aucun","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le réactif limitant est Na car il est consommé en premier (3 moles vs 2 moles de Cl₂ nécessaires).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Na\", \"b\": \"Cl₂\", \"c\": \"NaCl\", \"d\": \"Aucun\"}}","_debug_options_count":4},{"id":78538,"question":"La loi de conservation de la masse s'applique-t-elle aux réactions nucléaires ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Faux. La loi de conservation de la masse ne s'applique pas aux réactions nucléaires où la masse peut être convertie en énergie (E=mc²).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":78539,"question":"Quel est le volume molaire d'un gaz dans les conditions normales (CN) ?","option_a":"22,4 L\/mol","option_b":"11,2 L\/mol","option_c":"44,8 L\/mol","option_d":"2,24 L\/mol","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le volume molaire d'un gaz dans les CN est de 22,4 L\/mol.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"22,4 L\/mol\", \"b\": \"11,2 L\/mol\", \"c\": \"44,8 L\/mol\", \"d\": \"2,24 L\/m","_debug_options_count":4},{"id":78540,"question":"Si 5 g de CaCO₃ se décomposent en CaO et CO₂, quelle est la masse de CaO produite ?","option_a":"2,8 g","option_b":"5 g","option_c":"3,5 g","option_d":"1,4 g","option_e":"","option_f":"","bonne_reponse":"a","explication":"La masse de CaO produite est de 2,8 g (masse molaire CaCO₃ = 100 g\/mol, CaO = 56 g\/mol).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"2,8 g\", \"b\": \"5 g\", \"c\": \"3,5 g\", \"d\": \"1,4 g\"}}","_debug_options_count":4}]