Grade 7 Science: Elements, Compounds and Mixtures

As a culminating lesson, I held an interactive lecturette with my students, where we summarized what we have learned the first two chapters of the Learner’s Material for Grade 7 Science.

We first recalled the big ideas behind the previous laboratory activities from properties of solutions, concentration, and properties pure substances. The latest of which involves the electrolysis of water. Below are two videos showing how it was done:

This video shows a very similar process of electrolysis we did in the lab, except that we used NaOH instead of NaCl and we obtained Oxygen and Hydrogen, instead of Hydrogen and Chlorine.

This is another video showing a very simple way of performing electrolysis using a 9-V dry cell.

Here is a presentation that was used as guide for discussion:

Here is a simulation where you can build molecules by dragging atoms of various elements. When you click the image below, you will be asked to download a java simulation. If you have na updated Java Runtime Enviroment, you will have no problem opening the jnlp file that you will download. If not, you will have to download an updated JRE from

The simulation above is fun way to solidify the learnings of students about elements and compounds. There are more simulations at the PhET Website for you to explore.

Ariel Lalisan

Ariel Lalisan

Ariel Lalisan is a physics teacher at Alabel National Science High School. He is an advocate of constructivism approach in education. He employs active learning and independent learning in his lessons, and, of course, a lot of technology integration. His goal is to produce students who can solve problems on their own using the concepts they learn in the classroom. Ariel Lalisan is a Google Certified Innovator (Google Teachers Academy Southeast Asia 2014) and a community leader at Google Educator Group Sarangani. He is a co-founder of SoCCSKSarGen and he won the Globe Media Excellence Blogger of the Year Award in 2015.

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