Câu 1:
Các phản ứng xảy ra:
\(2KMn{O_4}\xrightarrow{{{t^o}}}{K_2}Mn{O_4} + Mn{O_2} + {O_2}\)
\(2Ca + {O_2}\xrightarrow{{{t^o}}}2CaO\)
\(CaO + {H_2}O\xrightarrow{{}}Ca{(OH)_2}\)
\(Ca{(OH)_2} + C{O_2}\xrightarrow{{}}CaC{O_3} + {H_2}O\)
\(CaC{O_3}\xrightarrow{{{t^o}}}CaO + C{O_2}\)
Câu 2:
a)
\(SO_2\): lưu huỳnh dioxit
\(FeO\): sắt (II) oxit
b)
Bari oxit: \(BaO\)
Sắt (III) oxit: \(Fe_2O_3\)
Bài 3:
Phản ứng xảy ra:
\(Zn + 2HCl\xrightarrow{{}}ZnC{l_2} + {H_2}\)
Ta có:
\({n_{Zn}} = \frac{{6,5}}{{65}} = 0,1{\text{ mol}} \to {{\text{n}}_{HCl}} = 2{n_{Zn}} = 0,2{\text{ mol}}\)
\({C_{M{\text{ HCl}}}} = \frac{{{n_{HCl}}}}{{{V_{dd}}}} = \frac{{0,2}}{{0,1}} = 2M\)
\({n_{{H_2}}} = {n_{Zn}} = 0,1{\text{ mol}} \to {{\text{V}}_{{H_2}}} = 0,1.22,4 = 2,24{\text{ lít}}\)
