Question

classifying chemical reactions
classify the following reactions as synthesis, decomposition, single replacement or double replacement.

1. $2kclo_3 \

ightarrow 2kcl + 3o_2$

1. $hcl + naoh \

ightarrow nacl + h_2o$

1. $mg + 2hcl \

ightarrow mgcl_2 + h_2$

1. $2h_2 + o_2 \

ightarrow 2h_2o$

1. $2al + 3nibr_2 \

ightarrow 2albr_3 + 3ni$

1. $4al + 3o_2 \

ightarrow 2al_2o_3$

1. $2nacl \

ightarrow 2na + cl_2$

1. $cacl_2 + f_2 \

ightarrow caf_2 + cl_2$

1. $agno_3 + kcl \

ightarrow agcl + kno_3$

1. $n_2 + 3h_2 \

ightarrow 2nh_3$

1. $2h_2o_2 \

ightarrow 2h_2o + o_2$

1. $(nh_4)_2so_4 + ba(no_3)_2 \

ightarrow baso_4 + 2nh_4no_3$

1. $mgi_2 + br_2 \

ightarrow mgbr_2 + i_2$

1. $so_3 + h_2o \

ightarrow h_2so_4$

1. $6kcl + zn_3(po_4)_2 \

ightarrow 3zncl_2 + 2k_3po_4$

Explanation:

Step1: Define reaction types

• Synthesis: $A + B

ightarrow AB$ (combine into 1 compound)

• Decomposition: $AB

ightarrow A + B$ (break into simpler substances)

• Single Replacement: $A + BC

ightarrow AC + B$ (1 element replaces another)

• Double Replacement: $AB + CD

ightarrow AD + CB$ (ions swap between compounds)

Step2: Classify each reaction

1. Match $2\text{KClO}_3

ightarrow 2\text{KCl} + 3\text{O}_2$ to decomposition.

1. Match $\text{HCl} + \text{NaOH}

ightarrow \text{NaCl} + \text{H}_2\text{O}$ to double replacement.

1. Match $\text{Mg} + 2\text{HCl}

ightarrow \text{MgCl}_2 + \text{H}_2$ to single replacement.

1. Match $2\text{H}_2 + \text{O}_2

ightarrow 2\text{H}_2\text{O}$ to synthesis.

1. Match $2\text{Al} + 3\text{NiBr}_2

ightarrow 2\text{AlBr}_3 + 3\text{Ni}$ to single replacement.

1. Match $4\text{Al} + 3\text{O}_2

ightarrow 2\text{Al}_2\text{O}_3$ to synthesis.

1. Match $2\text{NaCl}

ightarrow 2\text{Na} + \text{Cl}_2$ to decomposition.

1. Match $\text{CaCl}_2 + \text{F}_2

ightarrow \text{CaF}_2 + \text{Cl}_2$ to single replacement.

1. Match $\text{AgNO}_3 + \text{KCl}

ightarrow \text{AgCl} + \text{KNO}_3$ to double replacement.

1. Match $\text{N}_2 + 3\text{H}_2

ightarrow 2\text{NH}_3$ to synthesis.

1. Match $2\text{H}_2\text{O}_2

ightarrow 2\text{H}_2\text{O} + \text{O}_2$ to decomposition.

1. Match $(\text{NH}_4)_2\text{SO}_4 + \text{Ba(NO}_3\text{)}_2

ightarrow \text{BaSO}_4 + 2\text{NH}_4\text{NO}_3$ to double replacement.

1. Match $\text{MgI}_2 + \text{Br}_2

ightarrow \text{MgBr}_2 + \text{I}_2$ to single replacement.

1. Match $\text{SO}_3 + \text{H}_2\text{O}

ightarrow \text{H}_2\text{SO}_4$ to synthesis.

1. Match $6\text{KCl} + \text{Zn}_3(\text{PO}_4)_2

ightarrow 3\text{ZnCl}_2 + 2\text{K}_3\text{PO}_4$ to double replacement.

Answer:

1. Decomposition
2. Double Replacement
3. Single Replacement
4. Synthesis
5. Single Replacement
6. Synthesis
7. Decomposition
8. Single Replacement
9. Double Replacement
10. Synthesis
11. Decomposition
12. Double Replacement
13. Single Replacement
14. Synthesis
15. Double Replacement