LIMITING REACTANT AND THE AMOUNT OF PRODUCTS FORMED.pptx

Physical Science

1. LIMITING REACTANT AND THE AMOUNT OF PRODUCTS FORMED

2. What is a Limiting Reactant? - Also called as the limiting reagent. This are reactant that limits the ability/ amount of other reactants to combine, thus it limits the amount of product that can form in a chemical reaction. This are reagent that is completely used up or reacted.

3. What is a Excess Reactant? - This are the reagent/ reactants that are not fully used up when the reaction is finished.

4. Lets Make an Analogy: If there are 400 people wanting to fly to other country and there are 350 seats on the plane, how many people can go on a flight? Which is the limiting reactant in the example? Which one is the excess reactant?

5. Another Example :

6. How to find the limiting reactant? Use the given amount of a reactant to determine the needed amount of the other reactant. Compare the calculated( needed) amount to the actual given amount. If you have more than you needed then the substance is in excess.

7. Difference between a Chemical Reaction and Chemical Equation: Chemical reaction- deals with the process that involves rearrangement of the molecular or ionic structure of a substance. Chemical equation- shows the starting compounds-the reactant-on the left and final compound – the products-right.

8. Example:

9. What is Stoichiometry? Is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine the desired quantitative data.

10. Example: Balanced equation 2 EG + 1 EP  1 ToTa Legends EG= Egg EP= Eggplant ToTa = Tortang Talong +  ToTa

11. Steps on How to balance a chemical equation: Count the numbers of atoms of each element in the reactants and the products, and list each element and indicate the number of atoms in the reactants and products. Example: HCl + Na2S  H2S+NaCl

12. Steps on How to balance a chemical equation: 2. Find the limiting reagent and check if the reaction is balanced. 2Al + 3Cl2  2AlCl3 2.80g 4.25g

13. Step 1- Convert amounts (grams) to moles

14. Step 2 : Fin d th e l imi t ing r e a gent u s ing t h e s t oic h i o metr i c ra t i o.