{"id":9732,"date":"2024-07-16T18:21:12","date_gmt":"2024-07-16T16:21:12","guid":{"rendered":"https:\/\/www.hdebalzac.fr\/?p=9732"},"modified":"2024-07-02T17:43:45","modified_gmt":"2024-07-02T15:43:45","slug":"les-aventures-des-chimistes-de-3eme-eadp-la-spectaculaire-metamorphose-du-fer","status":"publish","type":"post","link":"https:\/\/www.hdebalzac.fr\/index.php\/2024\/07\/16\/les-aventures-des-chimistes-de-3eme-eadp-la-spectaculaire-metamorphose-du-fer\/","title":{"rendered":"Les aventures des chimistes de 3\u00e8me EADP : la spectaculaire m\u00e9tamorphose du fer"},"content":{"rendered":"\n<p class=\"has-drop-cap has-medium-font-size wp-block-paragraph\">Nos jeunes <strong>chimistes de 3<sup>\u00e8me<\/sup><\/strong> ont un d\u00e9fi de taille aujourd&rsquo;hui ! Ils vont percer les secrets d&rsquo;une r\u00e9action redoutable o\u00f9 m\u00eame le fer, pourtant si robuste, n&rsquo;a aucune chance face \u00e0 un acide puissant. Pourquoi faut-il prot\u00e9ger certains objets m\u00e9talliques du quotidien comme les bo\u00eetes de conserve ou les casseroles ? Car les acides ont la capacit\u00e9 de les corroder et de litt\u00e9ralement les faire fondre ! Seuls l&rsquo;inox, le cuivre et quelques autres alliages r\u00e9sistent \u00e0 cette attaque acide. Rejoignez vite nos intr\u00e9pides chimistes pour assister \u00e0 la m\u00e9tamorphose \u00e9tonnante du fer !<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">La grande enqu\u00eate sur le pH<\/h1>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-1024x1024.jpg\" alt=\"\" class=\"wp-image-9790 size-full\" srcset=\"https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-1024x1024.jpg 1024w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-300x300.jpg 300w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-150x150.jpg 150w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-768x768.jpg 768w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-1536x1536.jpg 1536w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-2048x2048.jpg 2048w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-pH-600x600.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Nos laborantins analysent d&rsquo;abord le pH de diff\u00e9rentes solutions \u00e0 l&rsquo;aide d&rsquo;un papier pH.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">\u00ab\u00a0Je pr\u00e9l\u00e8ve une goutte avec la tige en verre et je la d\u00e9pose sur le papier. Sa couleur m&rsquo;indique le pH\u00a0\u00bb, explique Lucas.<\/p>\n\n\n\n<ul class=\"wp-block-list\" style=\"font-size:16px\">\n<li style=\"font-size:16px\">Le vinaigre, orang\u00e9 ? Acide, avec un pH bas.<\/li>\n\n\n\n<li>L&rsquo;eau min\u00e9rale, vert p\u00e2le ? Neutre, ni acide ni basique.<\/li>\n\n\n\n<li style=\"font-size:16px\">Le liquide vaisselle, bleu azur ? Basique, id\u00e9al pour d\u00e9coller les salissures !<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h1 class=\"wp-block-heading\">Le fer \u00e0 la merci de l&rsquo;acide chlorhydrique<\/h1>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><video controls src=\"https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-Chimie-Acide-fer.mp4\"><\/video><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">\u00ab\u00a0Les hostilit\u00e9s sont lanc\u00e9es !\u00a0\u00bb pr\u00e9vient le professeur en rev\u00eatant gants et lunettes. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Saory verse prudemment l&rsquo;acide chlorhydrique HCl sur la paille de fer. Des bulles jaillissent aussit\u00f4t. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">\u00ab\u00a0Le fer dispara\u00eet litt\u00e9ralement !\u00a0\u00bb s&rsquo;exclame Djamal, stup\u00e9fait.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Poc ! Une flamme surgit quand Artus approche une allumette du tube \u00e0 essai.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">\u00ab\u00a0Du dihydrog\u00e8ne H<sub>2<\/sub> se d\u00e9gage !\u00a0\u00bb d\u00e9duit Marouane. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Mais que se passe-t-il exactement ?<\/p>\n<\/div><\/div>\n\n\n\n<h1 class=\"wp-block-heading\">Le professeur l\u00e8ve le voile<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">\u00ab\u00a0L&rsquo;acide chlorhydrique HCl est un acide fort qui r\u00e9agit violemment avec les m\u00e9taux comme le fer. C&rsquo;est une r\u00e9action d&rsquo;oxydor\u00e9duction : le fer m\u00e9tallique Fe perd des \u00e9lectrons pour former des ions fer II Fe<sup>2+<\/sup>, tandis que les ions H<sup>+<\/sup> de l&rsquo;acide captent ces \u00e9lectrons pour donner du dihydrog\u00e8ne H<sub>2<\/sub> gazeux.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\" style=\"font-size:18px\">Fe <sub>(s)<\/sub> + 2 HCl <sub>(aq)<\/sub> \u2192  FeCl<sub>2<\/sub> <sub>(aq)<\/sub> + H<sub>2<\/sub> <sub>(g)<\/sub><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">\u00ab\u00a0Et les ions Cl<sup>&#8211;<\/sup> s&rsquo;associent aux ions Fe<sup>2+<\/sup> pour former du chlorure de fer II FeCl<sub>2<\/sub> en solution aqueuse\u00a0\u00bb, compl\u00e8te Luna pensivement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Une v\u00e9ritable m\u00e9tamorphose chimique o\u00f9 le robuste m\u00e9tal n&rsquo;a d&rsquo;autre choix que de se dissoudre !<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Bravo \u00e0 nos laborantins ! Gr\u00e2ce \u00e0 leur minutieuse enqu\u00eate, ils ont compris pourquoi le fer ordinaire ne fait pas le poids face \u00e0 un acide comme l&rsquo;acide chlorhydrique. C&rsquo;est la raison pour laquelle on utilise des mat\u00e9riaux plus r\u00e9sistants comme l&rsquo;inox ou le cuivre pour fabriquer les ustensiles expos\u00e9s aux aliments acides. En \u00e9lucidant les myst\u00e8res de cette r\u00e9action spectaculaire, nos jeunes chimistes ont encore \u00e9tanch\u00e9 leur soif d&rsquo;apprendre et de comprendre le monde qui nous entoure. Pr\u00eats \u00e0 relever un nouveau d\u00e9fi scientifique ? L&rsquo;aventure palpitante ne fait que commencer !<\/p>\n\n\n<div class=\"wp-block-image is-style-rounded\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-logo.webp\" alt=\"\" class=\"wp-image-9792\" style=\"width:355px;height:auto\" srcset=\"https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-logo.webp 1024w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-logo-300x300.webp 300w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-logo-150x150.webp 150w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-logo-768x768.webp 768w, https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/07\/3EADP-logo-600x600.webp 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Nos jeunes chimistes de 3\u00e8me ont un d\u00e9fi de taille aujourd&rsquo;hui ! Ils vont percer les secrets d&rsquo;une r\u00e9action redoutable o\u00f9 m\u00eame le fer, pourtant si robuste, n&rsquo;a aucune chance [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":9719,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","omw_enable_modal_window":"enable","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[9,3],"tags":[51,38,23],"class_list":["post-9732","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-developpement-durable","category-formation","tag-3eadp","tag-chimie","tag-travaux-pratiques","entry","has-media"],"jetpack_featured_media_url":"https:\/\/www.hdebalzac.fr\/wp-content\/uploads\/2024\/06\/3EADP-Chimie-pH-reactions-scaled.jpg","views":"","publishpress_future_action":{"enabled":false,"date":"2026-06-01 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