Week of May 25th ,2020

Ms. D. Beckingham - Archived 09/23

Posted: May 24, 2020

This is the last unit of Chemistry 112. It focuses on quantitative analysis and typically this unit is used to strengthen your scientific concepts and laboratory skills/techniques. It is unfortunate that you will not be able to explore the lab this year. To be succesful in this unit, you must take everything you learned in the previous units an apply be able to apply it in a laboratory setting. The questions you will be working on are application based. This week will focus on gravimetric stoichiometry.

Quantitative analysis is determining the quantity of substances involved in chemical reactions. This is useful in medicine, agriculture and industry.
Reagent: a chemical that is used in a chemical reaction.
Limiting reagent:  the reactant that is completely consumed in the chemical reaction.

 

Excess reagent:  the reactant that is left over after the chemical reaction has taken place.

Gravimetric Stoichiometry: determining mass relationships in chemical reactions.  It is a quantitative analysis.

 

-Mole ratio is used for stoichiometric calculations
-Clear steps to follow:
*Form balanced chemical reaction and identify what values goes with what chemical.
*Convert the given measurement into moles using the appropriate formula.
*Use mole ratio to determine the moles of the substance you are looking for in the question. (divide by what you have and multiply by what you are looking for).

           *Use molar mass to calculate mass of the substance asked in the question.

 

See Khan Academy assignment to read an article about stoichiometry and watch 3 videos of exmple questions. I have placed 10 questions in the document section for you to work on.