The table shows the recipe and the available ingredients for making the maximum possible number of sandwiches.
making sandwiches recipe for one sandwich: 1 cheese slice, 2 lettuce leaves, 2 bread slices
total ingredients available: 8 cheese slices, 6 lettuce leaves, 6 bread slices
if the ingredients represent reactants of a chemical reaction, which of the following represents the leftover reactant?
two cheese slices
two lettuce leaves
five lettuce leaves
five cheese slices

five cheese slices

Explanation:

you need 1 cheese slices, 2 leaves, 2 bread slice per sandwich. you start out with 8 cheese slices , 6 leaves, 6 bread

so you make 3 sandwiches.

Five cheese slices

Explanation:

Limiting reagent is the chemical reactant which limits the formation of product. Excess reagent  is the chemical reactant which is left unreacted or unused.

Given:

1 cheese slice + 2 lettuce leaves + 2 bread slices = 1 sandwich

That is 2 bread slices, 2 lettuce leaves and 1 cheese slice is used for making one sandwich.

Available ingredients: 8 cheese slices + 6 lettuce leaves + 6 bread slices

Thus 6 bread slices, 6 lettuce leaves and 3 cheese slices are used for making 3 sandwiches.

Thus (8-3) = 5 cheese slices are the leftover or excess reactant.

Thus five cheese slices represent the leftover reactant.