Describe the difference between a single replacement reaction and a double repla

Question

Describe the difference between a single replacement reaction and a double replacement reaction?   Give generic examples of both using letters. (i.e. AB + C ???)

Describe the difference between a combination and a decomposition reaction?   Give generic examples of both using letters. (i.e. AB + C ???)

What is a diatomic molecule and when will it appear? What are the 7 atoms that will exist as a diatomic molecule?

Explain how to determine the molar mass of a compound. Give an example of determining the molar mass of a compound that includes a polyatomic ion.

Explanation / Answer

Single displacement is when only one species gets displaced from its solution, for example

Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)

Double displacement when two species are getting displaced simultaneously, for example

AgNO3(aq) + HCl(aq) --> AgCl(s) + HNO3(aq)

Combination reaction when species combine to form products, for example,

N2(g) + 3H2(g) --> 2NH3(g)

Decomposition reaction, where one species forms two or more products, for example,

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

Diatomic molecule consisting of two atoms. Atoms that exist in diatomic molecule form are,

O2, N2, Cl2, F2, I2, Br2, H2

Determination of molar mass, by calculating moles of polyatomic ion containg compound in solution. Divide mass of compound by moles to get molar mass. Polyatomic ion can also be reacted with a reagent to find its exact concentration and thus moles of it.

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