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【简答题】
（14分）中和热的测定实验的关键是要比较准确地配制一定的物质的量浓度的溶液，在实验过程中要尽量避免热量的散失，要求比较准确地测量出反应前后溶液温度的变化。回答下列问题： （1）从实验装置上看，图中尚缺少的一种玻璃用品是 。 （2）在大小烧杯之间填满碎泡沫（或纸条）其作用是____________________；大烧杯上如不盖硬纸板，求得的中和热数值 (填“偏大、偏小、无影响”) （3）做一次完整的中和热实验，温度计需要使用______ 次； （4）该实验0．50 mol·L － 1 HCl和0．55 mol·L － 1 的NaOH溶液各50 mL。若上述HCl、NaOH溶液的密度都近似为1 g/cm 3 ，中和后生成的溶液的比热容 C =' 4.18' J/（g·℃），反应后温度升高了△t, 则生成1mol水时的反应热ΔH='___________' kJ/mol（填表）。 （5）如果用50mL0.50mol/L醋酸与50mL0.55mol/LNaOH溶液进行反应，与上述实验相比，所放出的热量 (填“相等、不相等”)，简述理由 。
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