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The type of reaction represented by Zn plus 2NaCl yields 2Na plus ZnCl2 is an impossible one. It would be the other way around. 2Na + ZnCl2 --------> 2NaCl + Zn
Simply, the reactants are the original substances that are present at the beginning of a reaction. For example, in this reaction: 2Na + Cl2--> 2NaCl, the reactants are the Na and Cl.
NaCl itself is not a change. If you mean the formation of it from sodium ad chlorine, however, it is a chemical change.
Balanced equation for Sodium and Chlorine is: 2Na + Cl2 --> 2NaCl
The formation of water form hydrogen and oxygen: 2H2 + O2 --> 2H2O The formation of sodium chloride from sodium and chlorine: 2Na + Cl2 --> 2NaCl
Na2S2O3(aq) + 2HCL(aq) => 2NaCl(aq) + S(s) + SO2(g) + H2O(l)
2NaCl + H2SO4 = Na2SO4 + 2HCl
The synthesis reaction is: 2Na + Cl2 --> 2NaCl. The decomposition reaction is: 2NaCl --> 2Na + Cl2.
The reaction between H2SO4 and HCl gives you Sulphurous Acid (H2SO3). A quick test for H2SO3 is to blot filter paper with starch solution, then add iodine to give a blue/black stain. In the presence of H2SO3 this stain will be bleached.
Combination Reaction
The type of reaction represented by Zn plus 2NaCl yields 2Na plus ZnCl2 is an impossible one. It would be the other way around. 2Na + ZnCl2 --------> 2NaCl + Zn
Reaction 2HCl + Na2S2O3 --> 2NaCl + SO2 + S + H2O In words: 2 molecules hydrochloric acid plus 1 molecule sodium thiosulfate react to give --> 2 molecules sodium chloride, 1 molecule sulfur dioxide (gas) and 1 atom sulfur (solid) plus 1 water molecule
It is a double replacement reaction, also called a double displacement reaction.
Double-Replacement-Apex
No, Na2S(aq) + 2HCl(aq) ®2NaCl(aq) + H2S(g) is a double displacement reaction.
Single replacement A+
2NaCl+(NH4)2CO3