{"id":2375,"date":"2025-10-15T22:22:03","date_gmt":"2025-10-15T19:22:03","guid":{"rendered":"https:\/\/cedra.academy\/?p=2375"},"modified":"2025-11-03T16:28:22","modified_gmt":"2025-11-03T14:28:22","slug":"proprietatile-fizice-ale-substantelor-fenomene-fizice-si-chimice","status":"publish","type":"post","link":"https:\/\/cedra.academy\/?p=2375","title":{"rendered":"Propriet\u0103\u021bile fizice ale substan\u021belor. Fenomene fizice \u0219i chimice"},"content":{"rendered":"\n
Proprietatile fizice ale substan\u021belor. Fenomene fizice \u0219i chimice PPTX .<\/a>Descarc\u0103<\/a><\/div>\n\n\n\n

1. Propriet\u0103\u021bile fizice ale substan\u021belor<\/h3>\n\n\n\n

Propriet\u0103\u021bile fizice sunt acele caracteristici ale unei substan\u021be care pot fi observate sau m\u0103surate f\u0103r\u0103 a-i modifica compozi\u021bia chimic\u0103. Ele ne permit s\u0103 identific\u0103m \u0219i s\u0103 compar\u0103m diferite substan\u021be.<\/p>\n\n\n\n

Principalele propriet\u0103\u021bi fizice sunt:<\/p>\n\n\n\n

    \n
  • Starea de agregare:<\/strong> solid\u0103, lichid\u0103 sau gazoas\u0103. De exemplu, apa poate exista ca ghea\u021b\u0103, lichid sau vapori.<\/li>\n\n\n\n
  • Densitatea:<\/strong> raportul dintre mas\u0103 \u0219i volum. Substan\u021bele cu densitate mare se scufund\u0103 \u00een cele cu densitate mai mic\u0103.<\/li>\n\n\n\n
  • Punctul de topire \u0219i punctul de fierbere:<\/strong> temperatura la care o substan\u021b\u0103 se schimb\u0103 din solid \u00een lichid sau din lichid \u00een gaz.<\/li>\n\n\n\n
  • Solubilitatea:<\/strong> capacitatea unei substan\u021be de a se dizolva \u00eentr-un solvent, cum ar fi zah\u0103rul \u00een ap\u0103.<\/li>\n\n\n\n
  • Culoarea, mirosul \u0219i gustul:<\/strong> propriet\u0103\u021bi perceptibile prin sim\u021buri, f\u0103r\u0103 a modifica substan\u021ba.<\/li>\n\n\n\n
  • Conductivitatea electric\u0103 \u0219i termic\u0103:<\/strong> capacitatea substan\u021bei de a conduce electricitate sau c\u0103ldur\u0103.<\/li>\n<\/ul>\n\n\n\n

    Toate aceste propriet\u0103\u021bi ne ajut\u0103 s\u0103 descriem substan\u021bele \u0219i s\u0103 le folosim \u00een via\u021ba de zi cu zi, f\u0103r\u0103 s\u0103 le schimb\u0103m natura chimic\u0103.<\/p>\n\n\n\n

    2. Fenomene fizice<\/h3>\n\n\n\n

    Un fenomen fizic<\/strong> este o schimbare care afecteaz\u0103 doar propriet\u0103\u021bile fizice ale substan\u021bei, f\u0103r\u0103 a-i modifica compozi\u021bia chimic\u0103. Exemple de fenomene fizice:<\/p>\n\n\n\n

      \n
    • Topirea ghe\u021bii (solid \u2192 lichid)<\/li>\n\n\n\n
    • Evaporarea apei (lichid \u2192 gaz)<\/li>\n\n\n\n
    • Sublimarea ierbii uscate (solid \u2192 gaz)<\/li>\n\n\n\n
    • Ruperea, zdrobirea sau deformarea unui obiect<\/li>\n<\/ul>\n\n\n\n

      Caracteristicile fenomenelor fizice:<\/strong><\/p>\n\n\n\n

        \n
      • Substan\u021ba r\u0103m\u00e2ne aceea\u0219i<\/li>\n\n\n\n
      • Schimbarea este reversibil\u0103 \u00een majoritatea cazurilor<\/li>\n\n\n\n
      • Apar modific\u0103ri de form\u0103, stare sau dimensiune<\/li>\n<\/ul>\n\n\n\n

        3. Fenomene chimice<\/h3>\n\n\n\n

        Un fenomen chimic<\/strong> implic\u0103 transformarea unei substan\u021be \u00eentr-una sau mai multe substan\u021be noi, cu propriet\u0103\u021bi diferite de cele ini\u021biale. Aceste fenomene sunt cunoscute \u0219i sub denumirea de reac\u021bii chimice<\/strong>.<\/p>\n\n\n\n

        Exemple de fenomene chimice:<\/p>\n\n\n\n

          \n
        • Arderea lemnului sau a h\u00e2rtiei<\/li>\n\n\n\n
        • Ruginirea fierului (formarea oxidului de fier)<\/li>\n\n\n\n
        • Coacerea p\u00e2inii sau a pr\u0103jiturilor<\/li>\n\n\n\n
        • Digestia alimentelor \u00een organism<\/li>\n<\/ul>\n\n\n\n

          Caracteristicile fenomenelor chimice:<\/strong><\/p>\n\n\n\n

            \n
          • Se formeaz\u0103 substan\u021be noi<\/li>\n\n\n\n
          • Apar schimb\u0103ri de culoare, miros sau temperatur\u0103<\/li>\n\n\n\n
          • Procesul poate fi, de regul\u0103, ireversibil<\/li>\n<\/ul>\n\n\n\n

            4. Diferen\u021bele principale \u00eentre fenomenele fizice \u0219i cele chimice<\/strong><\/h3>\n\n\n\n
            Caracteristic\u0103<\/th>Fenomen fizic<\/th>Fenomen chimic<\/th><\/tr><\/thead>
            Schimbarea substan\u021bei<\/td>Nu se schimb\u0103<\/td>Se formeaz\u0103 substan\u021be noi<\/td><\/tr>
            Reversibilitate<\/td>De obicei reversibil<\/td>De obicei ireversibil<\/td><\/tr>
            Exemple<\/td>Topirea ghe\u021bii, evaporarea apei<\/td>Arderea h\u00e2rtiei, ruginirea fierului<\/td><\/tr>
            Observa\u021bii<\/td>Modific\u0103ri de form\u0103, stare sau dimensiune<\/td>Modific\u0103ri de culoare, miros, temperatur\u0103, apar substan\u021be noi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

            Prin cunoa\u0219terea propriet\u0103\u021bilor fizice \u0219i diferen\u021bierea fenomenelor fizice de cele chimice, elevii \u00eenva\u021b\u0103 s\u0103 studieze \u0219i s\u0103 \u00een\u021beleag\u0103 natura substan\u021belor \u0219i modul \u00een care acestea interac\u021bioneaz\u0103 cu mediul.<\/p>\n\n\n\n

            \"\"<\/figure>\n\n\n\n

            <\/p>\n\n\n\n

            <\/p>\n\n\n\n

            Fi\u0219a de lucru 1 \u2013 Identificarea propriet\u0103\u021bilor fizice<\/strong><\/h2>\n\n\n\n

            Instruc\u021biuni:<\/strong> Completeaz\u0103 tabelul cu propriet\u0103\u021bile fizice ale substan\u021belor date.<\/p>\n\n\n\n

            Substan\u021b\u0103<\/th>Culoare<\/th>Stare de agregare<\/th>Densitate<\/th>Punct de topire<\/th>Solubilitate \u00een ap\u0103<\/th><\/tr><\/thead>
            Ghea\u021b\u0103<\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
            Sare<\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
            Ulei<\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
            Metal (fier)<\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
            Zahar<\/td><\/td><\/td><\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

            \u00centreb\u0103ri:<\/strong><\/p>\n\n\n\n

              \n
            1. Care dintre substan\u021bele de mai sus se dizolv\u0103 \u00een ap\u0103?<\/li>\n\n\n\n
            2. Care substan\u021b\u0103 are densitatea cea mai mare?<\/li>\n<\/ol>\n\n\n\n

              Fi\u0219a de lucru 2 \u2013 Fenomene fizice sau chimice?<\/strong><\/h2>\n\n\n\n

              Instruc\u021biuni:<\/strong> \u00cen dreptul fiec\u0103rui exemplu scrie \u201efizic\u201d<\/strong> sau \u201echimic\u201d<\/strong>.<\/p>\n\n\n\n

                \n
              1. Topirea cear\u0103 de lum\u00e2nare \u2026<\/li>\n\n\n\n
              2. Fierberea apei \u2026<\/li>\n\n\n\n
              3. Arderea h\u00e2rtiei \u2026<\/li>\n\n\n\n
              4. Ruginirea fierului \u2026<\/li>\n\n\n\n
              5. Evaporarea alcoolului \u2026<\/li>\n\n\n\n
              6. Coacerea p\u00e2inii \u2026<\/li>\n\n\n\n
              7. Frigerea ghe\u021bii \u2026<\/li>\n\n\n\n
              8. Sublimarea ierbii uscate \u2026<\/li>\n<\/ol>\n\n\n\n

                \u00centreb\u0103ri:<\/strong><\/p>\n\n\n\n

                  \n
                • Ce caracteristic\u0103 deosebe\u0219te fenomenele chimice de cele fizice?<\/li>\n\n\n\n
                • Care dintre fenomenele fizice pot fi inversate?<\/li>\n<\/ul>\n\n\n\n

                  Fi\u0219a de lucru 3 \u2013 Desen \u0219i analiz\u0103<\/strong><\/h2>\n\n\n\n

                  Instruc\u021biuni:<\/strong><\/p>\n\n\n\n

                    \n
                  1. Deseneaz\u0103 schema unui fenomen fizic<\/strong> (ex: topirea ghe\u021bii).<\/li>\n\n\n\n
                  2. Deseneaz\u0103 schema unui fenomen chimic<\/strong> (ex: arderea h\u00e2rtiei).<\/li>\n\n\n\n
                  3. Sub fiecare desen, explic\u0103 \u00een cuvintele tale ce se \u00eent\u00e2mpl\u0103 cu substan\u021ba \u0219i dac\u0103 se formeaz\u0103 substan\u021be noi.<\/li>\n<\/ol>\n\n\n\n

                    Fi\u0219a de lucru 4 \u2013 Test gril\u0103<\/strong><\/h2>\n\n\n\n

                    Instruc\u021biuni:<\/strong> Bifeaz\u0103 r\u0103spunsul corect.<\/p>\n\n\n\n

                      \n
                    1. Care dintre urm\u0103toarele este o proprietate fizic\u0103?
                      a) Arderea lemnului
                      b) Densitatea apei
                      c) Ruginirea fierului<\/li>\n\n\n\n
                    2. Fenomenul \u00een care apa se transform\u0103 \u00een vapori este:
                      a) Chimic
                      b) Fizic<\/li>\n\n\n\n
                    3. Ruginirea fierului este un fenomen:
                      a) Fizic
                      b) Chimic<\/li>\n\n\n\n
                    4. Fenomenul reversibil se \u00eent\u00e2lne\u0219te mai des la:
                      a) Fenomene chimice
                      b) Fenomene fizice<\/li>\n<\/ol>\n\n\n\n

                      Fi\u0219a de lucru 5 \u2013 Problema aplicativ\u0103<\/strong><\/h2>\n\n\n\n

                      Instruc\u021biuni:<\/strong> Cite\u0219te \u0219i r\u0103spunde:<\/p>\n\n\n\n

                      Un cub de ghea\u021b\u0103 se tope\u0219te pe mas\u0103, iar o bucat\u0103 de h\u00e2rtie arde \u00eentr-un foc.<\/p>\n\n\n\n

                        \n
                      1. Care fenomen este fizic \u0219i care chimic? Explic\u0103.<\/li>\n\n\n\n
                      2. Ce propriet\u0103\u021bi fizice po\u021bi observa la ghea\u021b\u0103?<\/li>\n\n\n\n
                      3. Ce schimb\u0103ri apar la h\u00e2rtie?<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                        1. Propriet\u0103\u021bile fizice ale substan\u021belor Propriet\u0103\u021bile fizice sunt acele caracteristici ale unei substan\u021be care pot fi observate sau m\u0103surate f\u0103r\u0103 a-i modifica compozi\u021bia chimic\u0103. Ele ne permit s\u0103 identific\u0103m \u0219i […]<\/p>\n","protected":false},"author":1,"featured_media":2380,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,10],"tags":[],"_links":{"self":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/2375"}],"collection":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2375"}],"version-history":[{"count":1,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/2375\/revisions"}],"predecessor-version":[{"id":2379,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/2375\/revisions\/2379"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/media\/2380"}],"wp:attachment":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}