VIDEO: DILUTION LAB CALCULATIONS

Many students have still failed to submit the Dilution Lab assigned in Week 6, and tomorrow is the beginning of Week 8.   To assist students, Mr. Hatfield has made a VIDEO showing how to do the dilution calculations which are needed in order to use the simulation.   This calculation is similar to those taught in class and found in your textbook on pg. 296-297:

Following this, Mr. Hatfield demonstrates how to use this calculation in the simulation itself, to test your prediction of how many mL of a stock solution (14.6 M phosphoric acid) will be needed in order to manufacture 365 mL of 2.0 M dilute solution of the same substance:

This video reminds students they will need to convert given values in mL into Liters (L).  This is necessary, as this equation from pg. 296 uses molarity (M), which is defined as 'moles per liter':

WEEK AT A GLANCE: WEEK 7

 

VIDEO: BALANCING EQUATIONS

Students were provided two Assignments last week to review the skill of balancing equations.   

One was a short set (10 problems) of combination, decomposition and combustion reactions given in class on 2/16 or 2/17, called 'Balancing Equations Review'.

The other was a longer group of 15 problems that included single and double replacement reactions, and which asked students to identify the types of reactions as well as balance equations that were not already balanced, called 'Types of Reactions'.  This is due on Monday, 2/22.

To assist students in mastering these previously-taught skills, this VIDEO shows Mr. Hatfield solving examples of each type:

WEEK AT A GLANCE: WEEK 6

 

VIDEO: SOLUTION CHEMISTRY NOTES

In this VIDEO, Mr. Hatfield introduces largely-conceptual material for the completed unit on Solution Chemistry, covering material from sections 7.5, 7.6, 8.1, 8.2, 8.3 and 8.4 in the text, pages 236-298.

Topics covered included: aqueous systems, properties of water, properties of solution, concentration and molarity problems, percent composition, empirical and molecular formulas.

For information focusing on how to solve particular kinds of problems, see the earlier video placed on the class blog, 'Practice Test Problems'.

WEEK AT A GLANCE: WEEK 5

 

VIDEO: PRACTICE TEST PROBLEMS

In this VIDEO, Mr. Hatfield demonstrates the various kinds of calculation problems found on the Practice Test shared with students through their Microsoft Teams channel.

That includes the use of molar masses and conversion problems involving moles, grams, liters and number of particles, as previously taught last semester and reviewed HERE.  This material is covered in the text in sections 8.1 - 8.2 (pg. 262-279).

Calculations introduced this semester include percent composition, empirical and molecular formulas (Section 8.3, pg. 280-289) and molarity and dilution problems (Section 8.4, pg. 292-299).

A separate video will be made available to cover the conceptual material presented in this course since the beginning of the semester.