题目

Pancake Day is a special day and it is celebrated in many countries all around the world. On this day many people make and eat pancakes.Pancake Day is on a ____ in February or March. It is the day before Ash Wednesday, the start of Lent (大斋节). Lent is a period of 40 days before Easter. Easter is on a different day each year _____ it depends on (取决于) the moon. Easter is the first Sunday after the first full moon _____ spring. During Lent, people often _____eating things that are bad for ____ like fast food. _____, they make pancakes during Lent.Pancakes are very easy to make. First,A、B、C、D、E、F六种物质的转化关系如图所示（反应条件和部分产物未标出）（1）若A为短周期金属单质，D为短周期非金属单质，且所含元素的原子序数A是D的2倍，所含元素的原子最外层电子数D是A的2倍，F的浓溶液与A、D反应都有红棕色气体生成，则物质C中所含化学键类型为 ，写出反应④的化学方程式 ．（2）若A为常见的金属单质，D、F是气态单质，反应①在水溶液中进行，则反应②（在水溶液中进行）的离子方程式是 ，检验E物质中阳离子的操作和现象 ，A单质与1mol/L稀硝酸160mL恰好反应，最多消耗A单质 g．（3）若A、D、F都是短周期非金属元素单质，且A、D所含元素同主族，A、F所含元素同周期，则反应①的化学方程式为 ，写出D单质的一种用途 ．