Middle School Chemistry: Density: Sink and Float for Solids

Students determine whether a liquid will sink or float in water by comparing its density to the density of water.

See how different solids can have different densities depending on their molecular make-up.

See how different liquids can have different densities depending on their molecular make-up.

Students discover the concept that density is a characteristic property of water by measuring the volume and mass of water and calculating its density.

Students will use citric acid and sodium carbonate solutions to see that adding a base to an acidic solution makes the solution less acidic. Students will then use a base to help them identify which of two acidic solutions is more...

Explore heat, temperature, and the conduction of thermal energy through different materials.

Based on experimental observations, students describe, on the molecular level, why the liquid in a thermometer goes up when it is heated and down when it is cooled.

Six middle school chemistry lessons about the periodic table and bonding complete with handouts and animations.

Students see a demonstration of a color change using universal pH indicator and then change the concentrations of an acid and a base using a universal indicator to test the pH of the resulting solutions. Through an animation, they see...

Students observe, describe, and draw a model on the molecular level, showing how energy is transferred from one substance to another through conduction.