题目

Ms X leaves home at 6：00 in the morning．She spends an hour and a half in the traffic and arrives at her workplace at 8：00．At lunchtime，she stands in a queue and in the end finds there are no sandwiches left! On the way home she is in the traffic again and arrives home tired at 7:00．There is just time to cook something simple，watch all hour of TV and then have an early night． Ms Y gets up at 7：00 and goes for a run or does some exercise．After breakfast，she sits down to work at 8：30 in the office at the top of her house．Halfway through the morning，site has a short bre请根据题意回答下列问题．[在下列（1）（2）两小题中任选一题回答，若两小题都回答，则以第（1）小题的答案来评定分数．]（1）厨房中有两瓶失去标签的酱色液体，只知它们分别是酱油和食醋，请你利用家庭现有条件把它们区别开来（至少用两种方法）．简要写出方法、现象和结论．（2）黄金饰品中的假货常常鱼目混珠，社会上有些不法分子时常以黄铜（锌、铜合金）冒充黄金进行诈骗活动．因为黄铜单纯从颜色、外形上看，与黄金极为相似，所以很难区分．请你用物理方法和化学方法分别设计一个实验方案鉴别真假黄金，简要写出方法、现象和结论．