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苏丹红是一种染色剂．现发现其存在有限的致癌作用，不可服用．下表是苏丹红1号的有关信息： 编号 化学式 C 16 H 12 N 2 O ① 外观 暗红色或深黄色片状晶体 ② 溶解度 在水中：＜0.01/ml；汽油中：任意比互溶 ③ 熔点 404℃ ∽ 406℃ ④ 升华 475℃ ⑤ 致癌原因 在人体内分解出一种有毒的有机物（苯胺） 试回答下列问题： （1）苏丹红1号中含有______种元素，其相对分子质量为______，其中碳元素和氢元素的质量比是______． （2）上表给出的信息中，属于苏丹红1号物理性质的有（填编号______）． （3）苏丹红1号对动物和人体有致癌作用，主要是因为该物质在体内发生了______ （填“物理变化”或“化学变化”）．
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