Question

4. Составьте уравнения возможных реакций между металлами и растворами кислот 1) Ca + HCl→________________________________________________ 2) Au + HBr→________________________________________________ 3) Na + H3PO4→______________________________________________ 4) Ag + HCl→________________________________________________ 5) Zn + HI→__________________________________________________ 6) Na + HI→_________________________________________________ 7) Al + HI→__________________________________________________ 8) Hg + HCl→________________________________________________ 9) Cu + HBr→________________________________________________

Answer 1

1) Ca + 2HCl = CaCl2 + H2;

2) 2Au + 2HBr = 2AuBr + H2

3) 6Na + 2H3PO4 = 2Na3PO4 + 3H2;

4) 2Ag + 2HCl = 2AgCl +H2;

5) Zn +2HI= ZnI2 + H2;

6) 2Na + 2HI = 2NaI + H2;

7) 2Al + 6HI = 2AlI3 = 2AlI3 + 3H2;

8) Hg + 2HCl = HgCl2 + H2;

9) 2Cu + HBr = 2CuBr + H2.

Answer 2

1) Ca +2HCl→CaCl2+H2. 2) Au + 2HBr→ AuBr2+H2. 3)6Na+2H2PO4---2Na3PO4+3H2. 4)2Ag+2HCl---2AgCl+H2.5)Zn+2HI---ZnI2+H2. 6)2Na + 2HI→2NaI+H2. 7)) Al +6HI→ AlI3+3H2. 8)Hg +2HCl→HgCl2+H2. 9)Cu + 2HBr→CuBr2+H2