For example, magnesium plus oxygen yields... (These are the reactants and the products have to be guessed). The reaction type is synthesis and the answer is Mg+O2 yields MgO.

Another example is chlorine plus lithium iodide yields... (reactants) and the answer is Cl2+LiI yields LiCl +I2(products).


Question- Aluminum plus lead(II) nitrate yields...

Hello fashion

Note that this is your homework. So you should start posting the proper formula and valency for all chemicals involved here.

1 - Mg+O2 yields MgO :
valency magnesium =
valency oxygen =

2 - Cl2+LiI yields LiCl
valency chlorine =
valency lithium =
valency iodide =

3 - Formula for Aluminum plus lead(II) nitrate =
valence aluminum =
formula for lead(II) nitrate =
valency lead =
valency nitrogen =
valency oxygen =

Note that to get water (H2O) you need to know the individual components of this molecule, and the valency of it's components.
Why H2O and not HO or H2O2 ?
Do you need H2 and O to get water, or 2H and O, and what is the difference ?

Note that valency is a measure of the combining power of a particular element, equal to the number of single chemical bonds one atom can form. That number relates to the number of electrons an atom gives up or accepts when forming a compound.