This is a hands-on lab activity about the chemical composition and conductivity of water. Working in groups, learners will: conduct an experiment involving the process of electrolysis, prepare an experiment to better understand the process of ion exchange, discuss and research the "softness" and "hardness" of water, and use the periodic table to identify elements and learn their characteristics. Background information, a glossary and more is included. Materials needed for each student group include a 9-volt battery, two electrodes (e.g. copper strips, or two #2 pencils sharpened at both ends), electrical wire and glass beakers or ceramic saucers. This activity is part of the Aquarius Hands-on Laboratory Activities.

This video provides a step-by-step guide to determining nitrate and nitrite concentrations in a water sample, using a nitrate testing kit. It describes what chemical reactions are taking place throughout the testing process. The resource includes a video and a written transcript, and is supported by the Nitrate Protocol in the GLOBE Teacher's Guide. This is one of seven videos on hydrology in the 24-part instructional video series describing scientific protocols used by GLOBE (Global Learning and Observation to Benefit the Environment) a worldwide, hands-on, K-12 school-based science education program.

The video is a procedural guide to sampling salinity measurements in water bodies in the field. It provides a step-by-step explanation of field procedures and features students conducting the investigation and asking questions about what changes in salinity could indicate in rivers, lakes, and estuaries. The resource includes a video, transcript, and is supported by the Salinity Protocol in the GLOBE Teacher's Guide. This is one of seven videos on hydrology in the 24-part instructional video series describing scientific protocols used by GLOBE (Global Learning and Observation to Benefit the Environment), a worldwide, hands-on, K-12 school-based science education program.

Intermolecular attractions are responsible for everything from the temperatures at which substances boil to the power of your immune system in recognizing pathogens and the climbing ability of geckos! Feel the strength of London dispersion and dipole-dipole attractions, explore how intermolecular attractions affect boiling point and solubility, and investigate the special role of hydrogen bonds in DNA. Finally, design your own antibody based on intermolecular attractions.

Learn to identify different molecular shapes, to understand the interactions that create these shapes, and how to predict a molecule's shape given certain information about it. Explore these concepts using three-dimensional computer models and answer a series of questions to reinforce your understanding.

OER Fundamentals Academy participants are invited to remix this sharing template to design and share their OER project plans, course information, any related resources and syllabus, and reflection.

All cells, organs and tissues of a living organism are built of molecules. Some of them are small, made from only a few atoms. There is, however, a special class of molecules that make up and play critical roles in living cells. These molecules can consist of many thousands to millions of atoms. They are referred to as macromolecules (or large biomolecules).