Maîtrisez les acides et les bases : quiz interactif

Question 1 sur 10 10:00

[{"id":13983,"question":"Selon Brønsted-Lowry, un acide est une espèce chimique qui :","option_a":"Cède un proton (H+)","option_b":"Capte un proton (H+)","option_c":"Libère des ions OH-","option_d":"Ne réagit pas avec l’eau","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un acide, selon Brønsted-Lowry, est une espèce capable de céder un proton (H+).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13984,"question":"Le pH d’une solution est de 3. Cette solution est :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un pH de 3 indique une solution acide, car pH \u003C 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13985,"question":"Quel est le couple acide\/base associé à l’acide chlorhydrique (HCl) ?","option_a":"HCl \/ Cl-","option_b":"H3O+ \/ H2O","option_c":"NH4+ \/ NH3","option_d":"H2O \/ OH-","option_e":"","option_f":"","bonne_reponse":"A","explication":"L’acide chlorhydrique (HCl) perd un proton pour former Cl-, son couple acide\/base est donc HCl \/ Cl-.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13986,"question":"La formule du pH est :","option_a":"pH = log[H3O+]","option_b":"pH = -log[H3O+]","option_c":"pH = [H3O+]","option_d":"pH = 1\/[H3O+]","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le pH se calcule avec la formule pH = -log[H3O+], où [H3O+] est la concentration en ions oxonium.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13987,"question":"Une base est une espèce chimique qui peut :","option_a":"Céder un proton (H+)","option_b":"Capter un proton (H+)","option_c":"Libérer des ions H+","option_d":"Ne pas réagir avec l’eau","option_e":"","option_f":"","bonne_reponse":"B","explication":"Une base, selon Brønsted-Lowry, est une espèce capable de capter un proton (H+).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13988,"question":"Quel est le pH d’une solution dont la concentration en ions H3O+ est de 10^-5 mol\/L ?","option_a":"5","option_b":"3","option_c":"7","option_d":"9","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le pH se calcule avec pH = -log[H3O+] = -log(10^-5) = 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13989,"question":"Dans la réaction NH3 + H2O → NH4+ + OH-, l’espèce NH3 joue le rôle de :","option_a":"Un acide","option_b":"Une base","option_c":"Un solvant","option_d":"Un catalyseur","option_e":"","option_f":"","bonne_reponse":"B","explication":"NH3 capte un proton (H+) pour former NH4+, donc c’est une base selon Brønsted-Lowry.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13990,"question":"Une solution de pH 8 est :","option_a":"Acide","option_b":"Basique","option_c":"Neutre","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Un pH de 8 est supérieur à 7, donc la solution est basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13991,"question":"Le couple acide\/base H2O \/ OH- correspond à :","option_a":"L’eau et l’ion hydroxyde","option_b":"L’eau et l’ion hydronium","option_c":"L’acide chlorhydrique et l’ion chlorure","option_d":"L’ammoniac et l’ion ammonium","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le couple H2O \/ OH- représente l’eau (acide) et l’ion hydroxyde (base conjuguée).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":13992,"question":"La réaction acido-basique entre HCl et NaOH produit :","option_a":"De l’eau et du sel","option_b":"Du gaz carbonique","option_c":"De l’oxygène","option_d":"De l’hydrogène","option_e":"","option_f":"","bonne_reponse":"A","explication":"La réaction entre HCl (acide) et NaOH (base) produit de l’eau (H2O) et du sel (NaCl).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]