Stoichiometry

Question 1

What is stoichiometry

Answer 1

The study of quantitative relationships among the the product and reactants amounts in a reaction, based on molar ration

Question 2

Chemical equation are…

Answer 2

The basic tool of stoichiometry

Question 3

Limiting reactant

Answer 3

The reactant that runs out during a reaction

Question 4

Excess reactant

Answer 4

The reactant(s) that are left over after a reaction

Question 5

theoretical yield

Answer 5

Theoretical yield it the amount of product product that is a reaction is predicted to produce

Question 6

Actual yield

Answer 6

The amount of product that is actually recovered from a reaction

Question 7

Factors affecting yield

Answer 7

Competing reactions - a reaction that
Occurs with the main reaction lowering the yeild

Small surface area of reactants- reactions with a Small surface area slow the reaction and lower yield

Temperature of reactants - slows down particles causing less collisions, slowing the reaction and lowering the yield
Pressure of reactants - if reactants are gases lower pressure means less collisions, a slower reaction and lowers the yield.

Odd shaped/dirty reactants - other substances mixing with product and product trapped where it can’t be collected

Purity of reactants- calculations are made on the assumption that the reactants are pure which is rare

Lab techniques - product lost due to lab techniques

Question 8

How to calculate percent yield

Answer 8

Divide the actual yield
By the theoretical yield and multiply by 100

Question 9

finding limiting reactant

Answer 9

Calculate the amount of a product produced based of each reactant and the reactant that produces the lowest product is the limiting reactant