Classifying Chemical Reactions

[unkown2]

Hi,I need help on classifying chemical reactions.

I must classify between a single replacement, double replacement, synthesis,and decomposition. I also need to complete the following equations.

I basically know how to complete the equation if I knew what kind of reaction it is.

Can anyone give me tips on how to recognize what kind of chemical reaction it is?

 

HCL(aq) + Zn(s)->

H2O2 +MnO2-> I think that this is a double replacement.

CuCl2(aq)+ Mg(s)->

NH4NO3(aq)+NaOH(aq)->

Cu(NO3)2(aq)+Ni(s)->

AgNO3(aq)+NaCl(aq)-> I think that this is a single replacement.

Ni(NO3)2(aq)+Cu(s)->

HCL(aq)+CaCO3->

 

I need this on Monday so if anyone can help me till then it would be great.Thanks in advance.

[scientistsahai]

2HCl+Zn(s)---->ZnCl2+H2

H2O2+MnO2--->

CuCl2(aq)+ Mg(s)->MgCl2+Cu

NH4NO3(aq)+NaOH(aq)->NaNO3+NH3+H20

Cu(NO3)2(aq)+Ni(s)->

AgNO3(aq)+NaCl(aq)-> AgCl+NaNO3

Ni(NO3)2(aq)+Cu(s)->

HCL(aq)+CaCO3->CaCl2+H2O+CO2

I HOPE THESE ARE CORRECT ;REST DON'T KNOW

[YT2095]

h2o2+mno2= mno2+o+h2o

 

the mno2 is only a catalyst, it remains unaffected (therein lies a clue)

 

the other 2 you`ll have to work out the respective valency to see what metal will displace what (if at all)

[unkown2]

Thanks you guys.After some time of hard research I got some answers now.Care to check them?You can just tell me which are wrong and I'll try fixing them up.

2HCL(aq) + Zn(s)-> H2(g)+ZnCl2(aq)-single replacement

2H2O2 +MnO2-> 2O2+2H2O+Mn-Decomposition?

CuCl2(aq)+ Mg(s)->MgCl2(aq)+Cu(s)-single replacement

NH4NO3(aq)+NaOH(aq)->NaNO3+NH3+H2O-double replacement

Cu(NO3)2(aq)+Ni(s)->Cu(s)+Ni(NO3)2(aq)-single replacement

AgNO3(aq)+NaCl(aq)->NaNO3(aq)+AgCl(s)-double replacement

Ni(NO3)2(aq)+Cu(s)->Ni(s)+Cu(NO3)2(aq)-single replacement

2HCL(aq)+CaCO3(s)->CaCl2(aq)+H2O(l)+CO2(g)-double replacement

[YT2095]

"NH4NO3(aq)+NaOH(aq)->NaNO3+NH3+H2O-double replacement"

 

that one`s a bit tricky as the NH3 (gas) will instantly combine with the water to make NH4OH.

 

but the rest look just fine

[unkown2]

So its

NH4NO3(aq)+NaOH(aq)->NH4OH+NaNO3?

 

And one more question,

MnO2 + 2H2O2 = O2 +2H2O + MnO2

and

2H2O2 +MnO2-> 2O2+2H2O+Mn

 

which is correct?

[YT2095]

the top one as stated before, the MnO2 remains unchanged as it`s only a catalyst

[aommaster]

MnO2 + 2H2O2 = O2 +2H2O + MnO2

DEFINITELY!

 

The manganese oxide (MnO2) only acts as a catalyst. It remains unchanged but speeds up the decomposition of H2O2(hydrogen peroxide)

[wolfson]

MnO2 + 2H2O2 = O2 +2H2O + HEAT ENERGY as MnO2 is a catalyst, thus is non changed, and a collecting agent.

[unkown2]

Thank you very much,all of you for helping me!!!

[aommaster]

ur welcome Anytime!