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下表是稀硫酸与某金属反应的实验数据： 实验 序号 金属质量 /g 金属 状态 c(H 2 SO 4 ) /mol·L －1 V(H 2 SO 4 ) /mL 溶液温度/℃ 金属消失 的时间/s 反应前 反应后 1 0.10 粉末 0.5 50 20 35 50 2 0.10 丝 0.8 50 20 35 200 3 0.10 粉末 0.8 50 20 36 25 4 0.10 丝 1.0 50 20 35 125 分析上述数据，回答下列问题： （1）实验1和3表明， 对反应速率有影响，能表明这种影响因素的实验还有 。（填实验序号） （2）本实验中影响反应速率的其他因素还有 ，其实验序号是 ， 则反应速率越快（填怎样影响）。 （3）实验中的所有反应，反应前后溶液的温度变化值（约15 ℃）相近，推测其原因：
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