Question

1. classify following reactions (from your previous experiments) into one of the each of the four types listed below:

3Mg (s) + N2(g) --->Mg3N2(s)

2 KClO3(S) ---> 2 KCl(s) + 3O2(g)

Mg3N2(s) + 6H2O(l) ---> 3Mg(OH)2(aq) + 2 NH3 (g)

Mg(OH)2(s) --> MgO(s) + H2O (g)

S8(s) + 8O2(s) ---> 8SO2 (g)

4Fe(s) +3O2(s) ---> 2Fe2O3(s)

2 HgO(s) --> 2Hg(l) +O2(g)

Select Answers from the following list

(A) Decomposition

(B) Combination

(C)Double Displacement

(D) Single Displacement

2. classity each of the following statements as true or false based on the splint tests and solubility nules

A gas that ignites a glowing splint is oxygen

A gas that produces a "pop" with a burning splint is carbon dioxide

A gas that extinguishes a flame is hydrogen.

Pb(NO3)2 is soluble in water

AgBr is sotuble in water

Na2CO3 is soluble in water

Zn(NO3)2 is insoluble in water

MgCl2 is soluble in water

3. when two aqueous solutions were mixed a student observed bubbles were being evolved. was a physical or chemical change observed? Explain