题目

They asked Katherine Johnson for the moon, and she gave it to them. With little more than a pencil, a slide rule and one of the finest mathematical minds in the country, Mrs. Johnson, who died at 101 on Monday, calculated the precise trajectories (轨道)that would let Apollo 11 land on the moon in 1969 and, after Neil Armstrong's history—making moonwalk, let it return to Earth.Yet throughout Mrs. Johnson's 33 years in NASA and for decades afterward, almost no one knew her name.Mrs. Johnson was one of several hundred strictly educated, supremely capable yet largely unrecognized women who, we9．50ml0.50mol•L-1盐酸与50mL0.55mol•L-1NaOH溶液在如图所示的装置中进行中和反应．通过测定反应过程 中放出的热量可计算中和热．回答下列问题：（1）从实验装置上看，图中缺少的仪器是环形玻璃搅拌棒．（2）实验中若用70mL0.50mol•L-1盐酸跟70mL0.55mol•L-1NaOH溶液进行反应，与上述实验相比，所放出的热量不相等 （填“相等”或“不相等”），所求中和热相等（填“相等”或“不相等”）．（3）用50ml0.25mol•L-1H2SO4代替盐酸，用50mL0.275mol•L-1Ba（OH）2代替 NaOH溶液进行上述实验，测得的中和热的绝对值会偏大（填“偏大”“偏小”或“无影响”）．