The liquids did not mix — so what do density columns have to do with it? The seventh part in a series of nine provides the theoretical explanation of why density columns do not mix. The lesson covers the topics related to...

Students determine the correct homonym to use in a sentence. In this homonym lesson, students take an online quiz. They read a sentence and choose the correct homonym from a list. Students can click to see the correct answer.

Assess your ability to distinguish between exothermic and endothermic chemical reactions with this interactive multiple choice quiz. Receive immediate feedback to your answers.

Practice determining the hybridization for atoms in covalent compounds. Use the interactive scratch pad to work out the problems.

Find out your or your students' basic knowledge of concepts like matter, molecules and open and closed systems. Afterwards you can see how others answered the questions.

Assess your knowledge of mixtures and compounds and your ability to identify real-world examples with this interactive multiple choice quiz. Immediate feedback is provided.

Take an interactive quiz over the groups on the periodic table of elements. After completing the quiz, check your score, and then revisit any incorrect question for further review.

This interactive assessment features 6 matching, 6 multiple-choice, and 5 true/false question over 17 terms related to energy and their definitions. These include the following: Kinetic, Sound, Potential, Elastic potential, Chemical,...