These are measures of how much product and reactant exist in a chemical system at any given time.
Imagine you're baking cookies. The ingredients you start with (flour, sugar, eggs) are your reactants while finished cookies are your products. The amount you have of each at any point during baking represents their concentrations.
Molarity: This is a measure of concentration in terms of moles per liter, like measuring ingredients for cookies in cups per batch.
Limiting Reactant: This is the ingredient that runs out first during a chemical reaction - just as if you run out of flour while making cookies, it limits how many batches you can make.
Excess Reactant: An ingredient that remains after all other reactants have been used up - like having leftover chocolate chips after all your cookie dough has been baked into cookies.
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