Quiz — 37.._R.Land.Ta9i.Série.5.Chimie.Acide-Base - 2-.pdf

Question 1 sur 10 20:00

[{"id":66256,"question":"Selon la théorie de Brønsted-Lowry, quel espèce est toujours un acide ?","option_a":"Un donneur de protons (H+)","option_b":"Un accepteur de protons (H+)","option_c":"Une espèce neutre","option_d":"Une espèce chargée positivement","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un acide est défini comme un donneur de protons (H+). La base est l'accepteur de protons.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Un donneur de protons (H+)\", \"b\": \"Un accepteur de protons (H+)\",","_debug_options_count":4},{"id":66257,"question":"Le pH d'une solution de soude (NaOH) à 0,01 mol\/L est égal à :","option_a":"2","option_b":"7","option_c":"12","option_d":"14","option_e":"","option_f":"","bonne_reponse":"c","explication":"NaOH est une base forte qui libère OH- en solution. [OH-] = 0,01 mol\/L ⇒ pOH = 2 ⇒ pH = 14 - 2 = 12.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"2\", \"b\": \"7\", \"c\": \"12\", \"d\": \"14\"}}","_debug_options_count":4},{"id":66258,"question":"Vrai ou Faux ? Un indicateur coloré est toujours un acide ou une base faible.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un indicateur coloré est généralement un acide ou une base faible dont la forme acide et basique ont des couleurs différentes.","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":66259,"question":"Quel est le pH d'une solution d'acide chlorhydrique (HCl) à 0,1 mol\/L ?","option_a":"1","option_b":"3","option_c":"7","option_d":"13","option_e":"","option_f":"","bonne_reponse":"a","explication":"HCl est un acide fort qui se dissocie totalement. [H3O+] = 0,1 mol\/L ⇒ pH = -log(0,1) = 1.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"1\", \"b\": \"3\", \"c\": \"7\", \"d\": \"13\"}}","_debug_options_count":4},{"id":66260,"question":"Vrai ou Faux ? Dans une réaction acido-basique, les couples acido-basiques échangent un électron.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les couples acido-basiques échangent un proton (H+), pas un électron.","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":66261,"question":"Quel couple acido-basique est présent dans l'eau pure ?","option_a":"H3O+\/H2O","option_b":"H2O\/OH-","option_c":"HCl\/Cl-","option_d":"NH4+\/NH3","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'eau pure contient les couples H3O+\/H2O et H2O\/OH- (autoprotolyse de l'eau).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"H3O+\/H2O\", \"b\": \"H2O\/OH-\", \"c\": \"HCl\/Cl-\", \"d\": \"NH4+\/NH3\"}}","_debug_options_count":4},{"id":66262,"question":"Pour doser une solution d'acide sulfurique (H2SO4), quel indicateur utiliseriez-vous ?","option_a":"Phénolphtaléine","option_b":"Bleu de bromophénol","option_c":"Rouge de méthyle","option_d":"Bleu de thymol","option_e":"","option_f":"","bonne_reponse":"a","explication":"La phénolphtaléine change de couleur autour de pH 8-10, idéal pour doser un acide fort avec une base forte.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Phénolphtaléine\", \"b\": \"Bleu de bromophénol\", \"c\": \"Rouge de m","_debug_options_count":4},{"id":66263,"question":"Vrai ou Faux ? Une solution de pH = 7 est toujours neutre.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une solution de pH = 7 est neutre à 25°C, mais pas nécessairement à d'autres températures.","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":66264,"question":"Quel est le pKa du couple acide\/base CH3COOH\/CH3COO- si Ka = 1,8 × 10^-5 ?","option_a":"4,74","option_b":"5,26","option_c":"7,00","option_d":"9,26","option_e":"","option_f":"","bonne_reponse":"a","explication":"pKa = -log(Ka) = -log(1,8 × 10^-5) ≈ 4,74.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"4,74\", \"b\": \"5,26\", \"c\": \"7,00\", \"d\": \"9,26\"}}","_debug_options_count":4},{"id":66265,"question":"À l'équivalence d'un dosage acido-basique, le pH de la solution est toujours égal à 7.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le pH à l'équivalence dépend des espèces en présence. Pour un acide fort\/base forte, pH = 7. Sinon, il peut être différent.","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}]