Quiz — correction serie 2- forcé-23-24.pdf

Question 1 sur 10 20:00

[{"id":44035,"question":"Quelle est l'unité SI de la constante de Planck (h) ?","option_a":"J·s","option_b":"N·m","option_c":"kg·m²\/s","option_d":"W·s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La constante de Planck s'exprime en joule-seconde (J·s) dans le système international d'unités.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"J·s\", \"b\": \"N·m\", \"c\": \"kg·m²\/s\", \"d\": \"W·s\"}}","_debug_options_count":4},{"id":44036,"question":"La loi de Beer-Lambert relie l'absorbance à la concentration d'une espèce chimique en solution.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La loi de Beer-Lambert stipule que l'absorbance est proportionnelle à la concentration et à la longueur de la cuve.","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":44037,"question":"Quel est le nombre d'oxydation du carbone dans la molécule CO₂ ?","option_a":"+2","option_b":"+4","option_c":"-2","option_d":"0","option_e":"","option_f":"","bonne_reponse":"b","explication":"Dans CO₂, l'oxygène a un nombre d'oxydation de -2, donc le carbone a un nombre d'oxydation de +4 pour équilibrer la molécule.","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\": \"-2\", \"d\": \"0\"}}","_debug_options_count":4},{"id":44038,"question":"La force électrostatique entre deux charges est toujours attractive.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La force électrostatique est attractive si les charges sont de signes opposés et répulsive si elles sont de même signe.","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":44039,"question":"Quelle est la relation entre la fréquence (f) et la longueur d'onde (λ) d'une onde électromagnétique ?","option_a":"f = c\/λ","option_b":"f = λ\/c","option_c":"f = c·λ","option_d":"f = λ²\/c","option_e":"","option_f":"","bonne_reponse":"a","explication":"La relation fondamentale est f = c\/λ, où c est la vitesse de la lumière (3×10⁸ m\/s).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"f = c\/λ\", \"b\": \"f = λ\/c\", \"c\": \"f = c·λ\", \"d\": \"f = λ²\/c\"}}","_debug_options_count":4},{"id":44040,"question":"Un acide de Brønsted-Lowry est une espèce chimique capable de capter un proton (H⁺).","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un acide de Brønsted-Lowry est une espèce capable de céder un proton (H⁺), tandis qu'une base est capable de le capter.","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":44041,"question":"Quelle est l'expression de l'énergie cinétique d'un corps de masse m et de vitesse v ?","option_a":"E_c = ½mv","option_b":"E_c = mv²","option_c":"E_c = ½mv²","option_d":"E_c = mgh","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'énergie cinétique s'exprime par E_c = ½mv², où m est la masse et v la vitesse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"E_c = ½mv\", \"b\": \"E_c = mv²\", \"c\": \"E_c = ½mv²\", \"d\": \"E_c = ","_debug_options_count":4},{"id":44042,"question":"La réaction de saponification est une réaction d'estérification.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La saponification est une réaction de base d'un ester avec une base forte (NaOH ou KOH), produisant un savon et un alcool.","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":44043,"question":"Quel est le pH d'une solution de concentration en ions H₃O⁺ égale à 10⁻³ mol\/L ?","option_a":"pH = 3","option_b":"pH = 11","option_c":"pH = -3","option_d":"pH = 0","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pH est défini par pH = -log[H₃O⁺], donc pour [H₃O⁺] = 10⁻³, pH = 3.","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 = 3\", \"b\": \"pH = 11\", \"c\": \"pH = -3\", \"d\": \"pH = 0\"}}","_debug_options_count":4},{"id":44044,"question":"La loi de Newton F = ma s'applique uniquement aux mouvements rectilignes.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La deuxième loi de Newton (F = ma) s'applique à tout mouvement, qu'il soit rectiligne ou curviligne.","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}]