Quiz — precischimie.pdf

Question 1 sur 10 20:00

[{"id":9098,"question":"Quel est le nombre d'électrons de valence d'un atome de carbone ?","option_a":"2","option_b":"4","option_c":"6","option_d":"8","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le carbone (Z=6) a une configuration électronique 1s² 2s² 2p², soit 4 électrons de valence (2s² 2p²).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"2\", \"b\": \"4\", \"c\": \"6\", \"d\": \"8\"}}","_debug_options_count":4},{"id":9099,"question":"Une solution de pH = 3 est-elle acide ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un pH inférieur à 7 indique une solution acide. pH=3 est donc bien acide.","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":9100,"question":"Quelle est la formule brute du méthane ?","option_a":"CH","option_b":"CH₂","option_c":"CH₄","option_d":"C₂H₆","option_e":"","option_f":"","bonne_reponse":"c","explication":"Le méthane, premier alcane, a pour formule brute CH₄.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"CH\", \"b\": \"CH₂\", \"c\": \"CH₄\", \"d\": \"C₂H₆\"}}","_debug_options_count":4},{"id":9101,"question":"La réaction de combustion complète du méthane produit-elle du monoxyde de carbone ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La combustion complète du méthane (CH₄ + 2O₂ → CO₂ + 2H₂O) produit du dioxyde de carbone (CO₂), pas du monoxyde de carbone (CO).","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":9102,"question":"Quel est le nom de la liaison entre deux atomes de carbone dans l'éthène (C₂H₄) ?","option_a":"Liaison simple","option_b":"Liaison double","option_c":"Liaison triple","option_d":"Liaison dative","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'éthène (C₂H₄) possède une double liaison entre ses deux atomes de carbone (C=C).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Liaison simple\", \"b\": \"Liaison double\", \"c\": \"Liaison triple\", \"d","_debug_options_count":4},{"id":9103,"question":"Une solution de concentration molaire C = 0,1 mol\/L contient-elle 0,1 mole de soluté dans 1 L de solution ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Par définition, une solution de concentration 0,1 mol\/L contient 0,1 mole de soluté dans 1 litre de solution. La réponse est donc 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":9104,"question":"Quel est le produit principal de la réaction entre l'acide chlorhydrique (HCl) et l'hydroxyde de sodium (NaOH) ?","option_a":"Eau (H₂O)","option_b":"Chlore (Cl₂)","option_c":"Hydrogène (H₂)","option_d":"Oxygène (O₂)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La réaction entre HCl et NaOH est une réaction acido-basique produisant de l'eau (H₂O) et du chlorure de sodium (NaCl).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Eau (H₂O)\", \"b\": \"Chlore (Cl₂)\", \"c\": \"Hydrogène (H₂)\", \"d","_debug_options_count":4},{"id":9105,"question":"La loi de Beer-Lambert s'applique-t-elle uniquement aux solutions colorées ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La loi de Beer-Lambert (A = ε·l·C) s'applique à toute solution absorbant la lumière, qu'elle soit colorée ou non.","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":9106,"question":"Quel est le nom du groupe fonctionnel -OH ?","option_a":"Groupe carbonyle","option_b":"Groupe hydroxyle","option_c":"Groupe carboxyle","option_d":"Groupe amine","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le groupe -OH est appelé groupe hydroxyle et caractérise les alcools.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Groupe carbonyle\", \"b\": \"Groupe hydroxyle\", \"c\": \"Groupe carboxyl","_debug_options_count":4},{"id":9107,"question":"Un catalyseur augmente-t-il la vitesse d'une réaction chimique en modifiant l'énergie d'activation ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un catalyseur abaisse l'énergie d'activation de la réaction, ce qui augmente sa vitesse sans être consommé.","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}]