David Heldt

I have worked at Waianae for 10.5 years. It has been a challenging and enjoyable experience. I am a father of four kids, with one more on the way. Life is very rich and full!


Waianae High School

Recent Posts by David

Sat Feb 18, 2012 7:53 PM in Periodic Table Cards, amazing Inquiry results/resource
I have used a Periodic Table Activity in my class for years. I am not sure how it compares to the one mentioned in this post but I have the following properties listed on 2 x 3 cards for elements 1-54: electron configuration, oxidation number, atomic radius, ionization energy, physical state, and electronegativity. The students are given instructions on the trends in the periodic table observed in...

Sun Feb 05, 2012 3:55 AM in Nature's chemistry
I have often thought about this in terms of the chemical breakdown of everyday items from rubber bands to electronics. I live in Hawaii. My school is literally right next to the ocean. Very few rooms have air conditioning, so we live at the outside conditions. The heat, humidity, and salt in the air all contribute to an increase in the chemical breakdown of just about everything. It would be inter...