{"id":6836,"date":"2015-06-16T13:12:18","date_gmt":"2015-06-16T11:12:18","guid":{"rendered":"https:\/\/kamerpower.com\/?p=6836"},"modified":"2025-01-29T21:13:45","modified_gmt":"2025-01-29T20:13:45","slug":"epreuve-concours-ensp-chimie-et-physique-cameroun-3-concours-dentree","status":"publish","type":"post","link":"https:\/\/kamerpower.com\/fr\/epreuve-concours-ensp-chimie-et-physique-cameroun-3-concours-dentree\/","title":{"rendered":"Epreuve Chimie et Physique Cameroun 3 concours d’entr\u00e9e \u00e0 l\u2019Ecole Nationale Sup\u00e9rieure Polytechnique"},"content":{"rendered":"

Epreuve Concours ENSP Chimie et Physiqu<\/a>e\u00a03<\/strong><\/span><\/h3>\n

Ecole Nationale Superieure Polytechnique
\n(\u00c9preuve\u00a0de Chimie et Physique ENSP)<\/span>
\nKA<\/span>M<\/span>ER<\/span>POWER<\/span>.COM<\/span><\/p>\n

Probl\u00e8me\u00a01<\/span><\/h3>\n

On r\u00e9alise la combustion compl\u00e8te de 2 moles de but\u00e8ne<\/span><\/p>\n

    \n
  1. Donner la formule d\u00e9velopp\u00e9e de ce corps, =>\u00a0\u00a0dire \u00e0 quelle famille d\u2019hydrocarbures il appartient<\/span>, =>\u00a0dire quelle isom\u00e9trie il pr\u00e9sente<\/span> et => \u00a0donner les formules des diff\u00e9rentes isom\u00e8res en les nommant.<\/span><\/span><\/li>\n
  2. Ecrire l\u2019\u00e9quation \u00e9quilibr\u00e9e de la r\u00e9acton et calculer le volume de vapeur d\u2019eau produite mesur\u00e9e dans les conditions normales (volume molaire = 22,4 litres .<\/span><\/li>\n
  3. La totalit\u00e9 du gaz carbonique recueilli trouble l\u2019eau de chaux. Calculez la masse de carbonate de calcium form\u00e9e.<\/span><\/li>\n<\/ol>\n

    C = 12 g\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 H = 1 g\u00a0\u00a0\u00a0\u00a0 O = 16 g\u00a0\u00a0\u00a0 Ca = 40 g<\/span><\/p>\n

    \n

    Probl\u00e8me 2<\/span><\/h3>\n

    Un \u00e9lectron p\u00e9n\u00e8tre entre les plaques d\u2019un condensateur \u00e0 \u00e9gale distance des deux plaques distantes de h = 1 cm<\/span> et soumises \u00e0 une d.d.p<\/span> de 200V<\/span> avec une vitesse initiale parall\u00e8le aux plaques\u00a0 v = 50 000 km\/s<\/span><\/span><\/p>\n

      \n
    1. Sachant que les plaques du condensateur mesurent chacune 5 cm<\/span> de longueur, calculez l\u2019ordonn\u00e9e\u00a0 yM <\/sub><\/span>de l\u2019\u00e9lectron juste \u00e0 la sortie du condensateur<\/span><\/li>\n
    2. Un \u00e9cran fluorescent est plac\u00e9 \u00e0 une distance d = 20 cm<\/span> du condensateur, calculez l\u2019ordonn\u00e9e yE<\/sub><\/span> de l\u2019impact de l\u2019\u00e9lectron sur\u00a0 l\u2019\u00e9cran.\u00a0<\/span><\/span>\u00a0 e = 1,6.10<\/span>-19 C<\/span> \u00a0<\/sup>\u00a0 , \u00a0 me<\/sub> =0,9.10-30<\/sup>\u00a0 kg<\/span><\/li>\n<\/ol>\n
      \"ENSP

      ENSP Kamerpower l\u2019impact de l\u2019\u00e9lectron sur l\u2019\u00e9cran<\/span><\/p><\/div>\n

      Epreuve Concours ENSP Chimie et Physique Cameroun 3 concours d’entr\u00e9e \u00e0 l\u2019Ecole Nationale Sup\u00e9rieure Polytechnique<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

      ...<\/p>\n","protected":false},"author":1,"featured_media":5914,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[1701],"tags":[1724,1712,1727,1726],"class_list":["post-6836","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-epreuves","tag-chimie","tag-epreuve-de-concours-dentree-aux-grandes-ecoles-cameroun","tag-epreuve-ensp-concours-cameroun","tag-physique"],"_links":{"self":[{"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/posts\/6836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/comments?post=6836"}],"version-history":[{"count":1,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/posts\/6836\/revisions"}],"predecessor-version":[{"id":67822,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/posts\/6836\/revisions\/67822"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/media\/5914"}],"wp:attachment":[{"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/media?parent=6836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/categories?post=6836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kamerpower.com\/fr\/wp-json\/wp\/v2\/tags?post=6836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}