1. classify following reactions (from your previous experiments) into one of the
ID: 1002267 • Letter: 1
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
Explanation / Answer
1.
3Mg (s) + N2(g) --->Mg3N2(s) Combination Reaction
2 KClO3(S) ---> 2 KCl(s) + 3O2(g) Decomposition Reaction
Mg3N2(s) + 6H2O(l) ---> 3Mg(OH)2(aq) + 2 NH3 (g) Double Displacement Reaction
Mg(OH)2(s) --> MgO(s) + H2O (g) Decomposition Reaction
S8(s) + 8O2(s) ---> 8SO2 (g) Combination Reaction
4Fe(s) +3O2(s) ---> 2Fe2O3(s) Combination Reaction
2 HgO(s) --> 2Hg(l) +O2(g) Decomposition Reaction
2.
A gas that ignites a glowing splint is oxygen True
A gas that produces a "pop" with a burning splint is carbon dioxide False
A gas that extinguishes a flame is hydrogen. False
Pb(NO3)2 is soluble in water True
AgBr is sotuble in water True
Na2CO3 is soluble in water True
Zn(NO3)2 is insoluble in water False
MgCl2 is soluble in water True
3.
when two aqueous solutions were mixed a student observed bubbles were being evolved. was a physical or chemical change observed? Explain
It is a chemical change. Assuming there is no phase change due to the addition of outside heat or changes in pressure, bubbles indicate the production of a gas (assumed to be the byproduct of a chemical reaction). This means that a chemical change has been observed.
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