Quiz — DS N2 Chi SM-SP-ST 2020.pdf

Question 1 sur 10 20:00

[{"id":68806,"question":"Quelle est l'expression de la constante d'équilibre Kc pour la réaction : 2A + B ⇌ 3C ?","option_a":"Kc = [C]³ \/ ([A]² [B])","option_b":"Kc = [A]² [B] \/ [C]³","option_c":"Kc = [C] \/ ([A] [B])","option_d":"Kc = [A] [B] \/ [C]","option_e":"","option_f":"","bonne_reponse":"a","explication":"La constante d'équilibre Kc s'exprime en fonction des concentrations des produits sur les réactifs, chacun élevé à la puissance de leur coefficient stœchiométrique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Kc = [C]³ \/ ([A]² [B])\", \"b\": \"Kc = [A]² [B] \/ [C]³\", \"c\": \"K","_debug_options_count":4},{"id":68807,"question":"Une réaction chimique est à l'équilibre lorsque la vitesse de la réaction directe est égale à celle de la réaction inverse.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"À l'équilibre, les vitesses des réactions directe et inverse sont égales, ce qui ne signifie pas que les concentrations des réactifs et produits sont égales.","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":68808,"question":"Quelle est la formule de l'acide chlorhydrique ?","option_a":"HCl","option_b":"H₂SO₄","option_c":"HNO₃","option_d":"CH₃COOH","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'acide chlorhydrique est une solution aqueuse de chlorure d'hydrogène, de formule HCl.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"HCl\", \"b\": \"H₂SO₄\", \"c\": \"HNO₃\", \"d\": \"CH₃COOH\"}}","_debug_options_count":4},{"id":68809,"question":"Le pH d'une solution acide est toujours inférieur à 7.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pH d'une solution acide est inférieur à 7, car il y a plus d'ions H⁺ que dans l'eau pure.","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":68810,"question":"Quelle est l'équation de la réaction entre le zinc et l'acide chlorhydrique ?","option_a":"Zn + 2HCl → ZnCl₂ + H₂","option_b":"Zn + HCl → ZnCl + H₂","option_c":"Zn + 2HCl → ZnCl + H₂O","option_d":"Zn + HCl → ZnCl₂ + H₂","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le zinc réagit avec l'acide chlorhydrique pour former du chlorure de zinc et du dihydrogène, selon l'équation : Zn + 2HCl → ZnCl₂ + H₂.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Zn + 2HCl → ZnCl₂ + H₂\", \"b\": \"Zn + HCl → ZnCl + H₂\", \"","_debug_options_count":4},{"id":68811,"question":"Le nombre d'oxydation du soufre dans H₂SO₄ est +6.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Dans H₂SO₄, l'oxygène a un nombre d'oxydation de -2 et l'hydrogène de +1. Le soufre a donc un nombre d'oxydation de +6 pour équilibrer la charge.","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":68812,"question":"Quelle est la formule de l'hydroxyde de sodium ?","option_a":"NaOH","option_b":"NaCl","option_c":"Na₂CO₃","option_d":"NaHCO₃","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'hydroxyde de sodium, aussi appelé soude caustique, a pour formule NaOH.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"NaOH\", \"b\": \"NaCl\", \"c\": \"Na₂CO₃\", \"d\": \"NaHCO₃\"}}","_debug_options_count":4},{"id":68813,"question":"Une solution basique a un pH supérieur à 7.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une solution basique a un pH supérieur à 7, car elle contient plus d'ions OH⁻ que l'eau pure.","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":68814,"question":"Quelle est la réaction de neutralisation entre un acide et une base ?","option_a":"Acide + Base → Sel + Eau","option_b":"Acide + Base → Gaz + Sel","option_c":"Acide + Base → Sel","option_d":"Acide + Base → Oxygène + Sel","option_e":"","option_f":"","bonne_reponse":"a","explication":"La réaction de neutralisation entre un acide et une base produit un sel et de l'eau, selon l'équation : Acide + Base → Sel + H₂O.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Acide + Base → Sel + Eau\", \"b\": \"Acide + Base → Gaz + Sel\", \"","_debug_options_count":4},{"id":68815,"question":"Le chlore a un nombre d'oxydation de -1 dans tous ses composés.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le chlore a un nombre d'oxydation de -1 dans les composés où il est l'élément le plus électronégatif, mais il peut avoir d'autres nombres d'oxydation dans d'autres contextes (ex. : +1 dans Cl₂O).","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}]