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Conservation de la Mati re

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Conservation de la Mati re

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    1. Conservation de la Matire Est-ce que la quantit de matire change lors dun changement physique ou chimique? Est-ce que la matire qui est transforme change de masse?

    2. Conservation de la Matire EXPRIENCE A: fusion de glace En mettant de la glace dans un contenant elle peut fondre et svaporer. Si on couvre le contenant, la vapeur deau reste enferme dans le contenant. Donc, la MASSE ne change pas

    3. Conservation de la Matire EXPRIENCE B: acide + craie On fait ragir un acide et de la craie. Les deux ragissent et forment un gaz. Si le bcher est couvert, le gaz ne part pas. Donc, la MASSE ne changent pas

    5. EXEMPLE: On fait ragir 5g de vinaigre avec 10g de bicarbonate de soude dans un contenant ferm. Sil y a eu 2g de gaz form, quelle est la masse des autres produits?

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