Chemical Reactions Tutorial Questions

1) Reactants

2) Products

3) Chemical change has taken place

4) rearrangement

5) breaking, forming

6) Same atoms

7) missing atoms, new atoms

8) rearrange the bonds

9) two, one, one, one

10) 2 H2 + 1 O2 → 2 H2O
Column 1 Column 2
4 hydrogen atoms 4 hydrogen atoms
2 oxygen atoms 2 oxygen atoms

11) Law of Conservation of Mass

12) atoms, mass

13) 1, 1, 1

14) Column 1 Column 2
1 1
2 1

15) CuO, O

16) O, Cu, Cu

17) 2 Cu+ 1 O2 → 2 CuO
Column 1 Column 2
2 2
2 2

18) 1 CH4 + 1 O2 → 1 H2O + 1 CO2

19) 1 N2 + 3 H2 → 2 NH3

20) 2 KCIO3 → 2 KCI + 3 O2

21) 4 Al + 3 O2 → 2 Al2O3

Summary

1) Breaking Bonds, making bonds or both

2) the same atoms present before and after the reaction

3) Coefficients, atom