一 How about going hiking this weekend?
一 Sorry. I prefer rather than .
A:to stay at home; go out
B:to go out; stay at home
C:staying at home; go out
某化工厂打算用 铜、硫酸和硝酸等原料制备Cu(NO3)2溶液,某同学通过查阅 资料设计出4种制备方案,其原理分别是:(假设原料利用率为100%)
①Cu+4HNO3(浓) Cu(NO3)2+2NO2↑+2H2O
②3Cu+8HNO3(稀) 3Cu(NO3)2+2NO↑+4H2O
③2Cu+O2 2CuO; CuO+2HNO3═Cu(NO3)2+H2O
④Cu+2H2SO4(浓) CuSO4+SO2↑+2H2O;CuSO4+Ba(NO3)2═Cu(NO3)2+BaSO4↓