物质是能量越高越稳定，还是越低越稳定，不是说能量越高化学键越难断，就越稳定吗？ 高中化学中物质能量越高越稳定还是越低越稳定？
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\u3010\u952e\u80fd\u3011
\u5916\u6587\u540d\u79f0\uff1aBond Energy
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\u540d\u8bcd\u9886\u57df\uff1a\u5316\u5b66
\u4f5c\u7528\uff1a\u53cd\u6620\u5206\u5b50\u7a33\u5b9a\u6027
\u542b\u4e49\uff1a
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\u952e\u80fd\u662f\u8868\u5f81\u5316\u5b66\u952e\u5f3a\u5ea6\u7684\u7269\u7406\u91cf\uff0c\u53ef\u4ee5\u7528\u952e\u65ad\u88c2\u65f6\u6240\u9700\u7684\u80fd\u91cf\u5927\u5c0f\u6765\u8861\u91cf\u3002\u5728101.3kPa\u548c298K\u4e0b\uff0c\u5c061mol\u6c14\u6001\u5206\u5b50AB\u65ad\u88c2\u6210\u7406\u60f3\u6c14\u6001\u539f\u5b50\u6240\u5438\u6536\u7684\u80fd\u91cf\u53eb\u505aAB\u7684\u79bb\u89e3\u80fd(KJ\u00b7mol),\u5e38\u7528\u7b26\u53f7D(A-B)\u8868\u793a\u3002\u5373:AB(g)\u2500\u2192A(g)+ B(g)
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NH3(g)= NH2(g)+ H(g) D1 = 435kJ\u00b7mol
NH2(g)= NH(g)+ H(g) D2= 397kJ\u00b7mol
NH(g)= N(g)+ H(g) D3= 339kJ\u00b7mol
NH3\u5206\u5b50\u4e2d\u867d\u7136\u6709\u4e09\u4e2a\u7b49\u4ef7\u7684N-H\u952e\uff0c\u4f46\u5148\u540e\u62c6\u5f00\u5b83\u4eec\u6240\u9700\u7684\u80fd\u91cf\u662f\u4e0d\u540c\u7684\u3002\u6240\u8c13\u952e\u80fd(Bond Energy)\u901a\u5e38\u662f\u6307\u5728101.3KPa\u548c298K\u4e0b\u5c061mol\u6c14\u6001\u5206\u5b50\u62c6\u5f00\u6210\u6c14\u6001\u539f\u5b50\u65f6\uff0c\u6bcf\u4e2a\u952e\u6240\u9700\u80fd\u91cf\u7684\u5e73\u5747\u503c\uff0c\u952e\u80fd\u7528E\u8868\u793a\u3002\u663e\u7136\u5bf9\u53cc\u539f\u5b50\u5206\u5b50\u6765\u8bf4\uff0c\u952e\u80fd\u7b49\u4e8e\u79bb\u89e3\u80fd\uff0c\u4f8b\u5982\uff0c298.15K\u65f6\uff0cH\u7684\u952e\u80fdE(H-H)=D(H-H)=436kJ\u00b7mol;\u800c\u5bf9\u4e8e\u591a\u539f\u5b50\u5206\u5b50\u6765\u8bf4\uff0c\u952e\u80fd\u548c\u79bb\u89e3\u80fd\u662f\u4e0d\u540c\u7684\u3002\u4f8b\u5982NH\u5206\u5b50\u4e2dN-H\u952e\u7684\u952e\u80fd\u5e94\u662f\u4e09\u4e2aN-H\u952e\u79bb\u89e3\u80fd\u7684\u5e73\u5747\u503c:
E(N-H)=(D1+D2+D3)/3=1171/3=391kJ\u00b7mol
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物质总能量越低，要将其化学键断开需要的能量就越高，所以物质的能量越低越稳定。记住即可
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绛旓細鐗╄川鐨鑳介噺瓒婁綆瓒婄ǔ瀹氱殑锛屼竴涓鐗╄川瓒婄ǔ瀹氾紝涓鑸潵璇村畠鐨勫師瀛愰棿浣滅敤瓒婂己銆傚強鍖栧閿己
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绛旓細鐗╄川鍏锋湁鐨勮兘閲忓拰閿兘鏄袱涓笉鍚岀殑姒傚康.绠鍗曟潵璇,閿兘瓒婂ぇ,鐗╄川瓒婄ǔ瀹;鑰岀墿璐ㄥ叿鏈夌殑鑳介噺瓒婁綆,鐗╄川瓒婄ǔ瀹.鎵浠ュ彲浠ョ畝鍗曠悊瑙ｄ负閿兘瓒婂ぇ,鐗╄川鍏锋湁鐨勮兘閲忚秺浣.鈻矵=鍙嶅簲鐗╃殑閿兘-鐢熸垚鐗╃殑閿兘 ^^^鈶 鈻矵=鐢熸垚鐗╃殑鎬昏兘閲-鍙嶆槧鐗╃殑鎬昏兘閲 ^^^鈶 涓ゅ紡閮芥纭,骞朵笉鐭涚浘.鎵撲釜涓嶅お鎭板綋鐨勬瘮鍠,鍦ㄥ北椤朵笂...
绛旓細瓒婄ǔ瀹氱殑鐗╄川鑳介噺鐩稿杈冧綆锛屽洜涓鑳介噺瓒婁綆瓒婄ǔ瀹鍘熷垯銆傚悓绉嶅厓绱犱竴鑸笉姣旇緝鍒嗗瓙鍜屽師瀛愮殑绋冲畾鎬э紝浣嗘槸鐢变簬褰㈡垚鍒嗗瓙鍚庢渶澶栧眰杈惧埌绋冲畾鐘舵侊紝鑰屽師瀛愯繕娌¤揪鍒帮紝鎵浠ュ垎瀛愭洿绋冲畾銆傚垎瀛愬彉鍘熷瓙涓瀹氭槸鍚哥儹鍙嶅簲锛岀敱浜庢柇瑁傚寲瀛﹂敭鏄惛鐑殑銆
绛旓細鍥炵瓟锛氬叾瀹炶繖閲岃鐨勮兘閲忔寚鐨勬槸鐗╄川鐨勫畯瑙傝兘閲忚屼笉鏄敭鑳,瀹忚鑳介噺瓒婇珮,鐗╄川瓒娲绘臣,鍙嶄箣瓒婄ǔ瀹;濡傛灉浠庨敭鑳界殑瑙掑害鍒嗘瀽,閿兘瓒婂ぇ,绋冲畾鎬ц秺寮,鍙嶄箣,绋冲畾鎬ц秺寮辫拷闂:
绛旓細鑳介噺瓒婁綆瓒婄ǔ瀹.渚嬪鏍稿鐢靛瓙灏辨绘槸瓒嬩簬浠庨珮鑳界骇杞ㄩ亾鍚戜綆鑳界骇杞ㄩ亾璺冭縼.
