Make It Yours®
Guided Practice of the Skill of Analysis ‑ Barking Dog

 I. Goal:  Analyze the barking dog demonstration to determine the reason for the
              phenomena using the skill of analysis (Scientific Method).

 II. What are the elements of the demonstration?

              A. Materials/Equipment (Do experiment in a well ventilated
                  space above 65°F)     

                     1.  Graduated cylinder     

                     2.  Filter paper

                     3.  Solution of carbon disulfide and white phosphorous

              B. Changes/reactions that occur ‑ Experimental
                   observations
                     1.  The filter paper is placed on the top of the
                          graduated cylinder.

                     2.  The solution is poured into the center of the filter
                           paper.

                                                                   3. 

                                                                   4. 

                                                                   5. 

                                                                   6.  Simultaneously: a) a blue fireball goes down the cylinder.

                                                                                                b)

                                                                                                c) 

Above is a sampling of the Barking Dog demonstration worksheet. This demo is done the first day of chemistry

class using the worksheet as a guided practice for teaching the thinking skill called the "scientific method".

(The actual document is two pages in length and includes answers.)

This classic demonstration created by Dr. Alyea shows students chemistry is fun. The worksheet is used as a

model for students to follow when applying the skill of analysis, the Scientific Method. This  model can be used for

writing up all classroom demonstrations.

Student should be accountable for learning the material presented. Requiring students to complete a write-up or

testing them on the material taught in the demonstration conditions students that demonstrations are not only

for entertainment.

To enable students' long range memory: 1) Have students complete a write-up of the all experiments and

demonstrations using the formatted thinking skills model. 2) Collect their write-ups.   3) Evaluate the write-ups. 

4)  Return the evaluated write-ups in a timely manner.