• اول اعدادي2
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  • ﻋﻠل: ﯾﺣﻔظ اﻟﺻودﯾوم و اﻟﺑوﺗﺎﺳﯾوم ﺗﺣت ﺳطﺢ اﻟﻛﯾروﺳﯾن ؟
    ﻻﻧﮭﺎ ﻋﻧﺎﺻر ﻧﺷطﺔ ﺟدا ﻛﯾﻣﯾﺎﺋﯾﺎ ﺗﺗﻔﺎﻋل ﺑﺳرﻋﺔ ﻣﻊ اﻛﺳﯾﺟﯾن اﻟﮭواء اﻟرطب
  • ﻋﻠل :طﻼء اﻟﻛﺑﺎري اﻟﻣﻌدﻧﯾﺔ وأﻋﻣدة اﻹﻧﺎرة ﻣن وﻗت ﻻﺧر؟
    ﻟﺣﻣﺎﯾﺗﮭﺎ ﻣن اﻟﺻدأ -.
  • - ﻋﻠل ﯾﺳﺗﺧدم اﻟذھب اﻟﻔﺿﺔ واﻟﺑﻼﺗﯾن ﻓﻲ ﺻﻧﺎﻋﺔ اﻟﺣﻠــﻲ؟
    ﺑﺳﺑب ﺿﻌف ﻧﺷﺎطﮭﺎ اﻟﻛﯾﻣﯾﺎﺋﻰ ﻣﻣﺎ ﯾﺟﻌﻠﮭﺎ ﺗﺣﺗﻔظ ﺑﺑرﯾﻘﮭﺎ ﻟﻔﺗرة طوﯾﻠﺔ
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