How would you compare a single replacement reaction to a double replacement reaction?in laymans terms?

2 answers

I don't know how to start. Where do you want to go with this?
a single replacement is a reaction between a compound with two species and a compound with one species such as:

2NaOH + H2 ==> 2Na + 2H-OH

a double replacement reaction is where two compounds, both with two species react such as

NaOH + HCl ==> NaCl + H-OH
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