Quiz — 6763e77faad8e__Série de révision de chimie (copie finale)-- Trimestre 1.pdf

Question 1 sur 5 10:00

[{"id":1809,"question":"Quel est le pH d'une solution de HCl de concentration 10^-2 mol\/L ?","option_a":"pH = 2","option_b":"pH = 7","option_c":"pH = 12","option_d":"pH = 14","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pH d'une solution d'acide fort se calcule avec la formule pH = -log[H3O+]. Ici, [H3O+] = 10^-2 mol\/L, donc pH = -log(10^-2) = 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"pH = 2\", \"b\": \"pH = 7\", \"c\": \"pH = 12\", \"d\": \"pH = 14\"}}","_debug_options_count":4},{"id":1810,"question":"Dans une pile Daniell, quel est le rôle de la pont salin ?","option_a":"Maintenir l'électroneutralité des solutions","option_b":"Favoriser la réaction d'oxydation","option_c":"Augmenter la tension de la pile","option_d":"Ralentir la réaction","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pont salin permet de fermer le circuit électrique en assurant le passage des ions pour maintenir l'électroneutralité des solutions anodique et cathodique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Maintenir l'électroneutralité des solutions\", \"b\": \"Favoriser l","_debug_options_count":4},{"id":1811,"question":"Quelle est la relation entre la constante d'équilibre K et l'enthalpie libre standard ΔG° ?","option_a":"ΔG° = -RT ln K","option_b":"ΔG° = RT ln K","option_c":"ΔG° = K \/ RT","option_d":"ΔG° = -R \/ T ln K","option_e":"","option_f":"","bonne_reponse":"a","explication":"La relation fondamentale est ΔG° = -RT ln K, où R est la constante des gaz parfaits, T la température en kelvins et K la constante d'équilibre.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"ΔG° = -RT ln K\", \"b\": \"ΔG° = RT ln K\", \"c\": \"ΔG° = K \/ RT\",","_debug_options_count":4},{"id":1812,"question":"Lors d'un titrage acido-basique, quel indicateur coloré utilise-t-on pour un titrage fort\/fort ?","option_a":"Phénolphtaléine","option_b":"Bleu de bromophénol","option_c":"Hélianthine","option_d":"Rouge de méthyle","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour un titrage fort\/fort, la phénolphtaléine est l'indicateur le plus adapté car son intervalle de virage (pH 8,2–10) correspond au point d'équivalence (pH = 7).","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\": \"Hélianthi","_debug_options_count":4},{"id":1813,"question":"Quelle est la formule de la concentration molaire d'une solution ?","option_a":"C = n\/V","option_b":"C = m\/V","option_c":"C = V\/n","option_d":"C = n × V","option_e":"","option_f":"","bonne_reponse":"a","explication":"La concentration molaire C (en mol\/L) se calcule avec la formule C = n\/V, où n est la quantité de matière (en mol) et V le volume de la solution (en L).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"C = n\/V\", \"b\": \"C = m\/V\", \"c\": \"C = V\/n\", \"d\": \"C = n × V\"}}","_debug_options_count":4}]