A slice is a countable noun or uncountable noun. In my book it's not given that a slice of bread, pizza or cake. It's only written a slice is a countable or uncountable noun

Dear Student,
Slice is a countable noun. 
E.g. A slice of lemon => 1 slice 
Two-slices of lemon=> Two different slices of lemon.
Thus we are able to count how many slices of lemon. 
Regards 

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