This animation shows the effect of change the volume of a gas phase equilibrium mixture where the numbers of reactant and product molecules are different.

This is the document for the determination of the percent acetic acid in an unknown solution lab.

This activity presents a fun, collaborative and interdisciplinary way to get students excited about the study of human genetics. Students pair up to create a genetic portrait of their imaginary family based on several observable, heritable traits. By actively using their knowledge, students will appreciate the importance and meaning of the study of genetics in its real-life context.

This animation allows students to view the processes of photosynthesis and respiration. In particular, it tackles the common misconception among students that respiration in plants does not take place at the same time as photosynthesis. Teachers' notes are provided.

Part of NCSSM CORE collection: This animation demonstrates the ratio of the combining volumes of hydrogen and oxygen gas to form water.

Part of NCSSM CORE collection: This animation shows how the volume of a gas changes with the number of moles of gas at constant temperature and pressure.

Part of NCSSM CORE collection: This is the document for the conductivity titration of Ba(OH)2 with H2SO4.

In this activity, students use their knowledge of levers to compete against another student in a simple game. Students will add wooden blocks or similar objects to a tray balanced on a pivot. By competing to keep the tray level, students will learn about the physics of levers.

This illustration shows a close-up of a section of the band of stability and shows the types of decay a radioactive isotope might undergo to become stable.

In this lesson, students discuss and demonstrate the internal structure of the magnet through a kinesthetic activity.

In this lesson, students discover the impact that flooding has on people's lives, and how science and technology can mitigate its effects and help find potential solutions. Working in teams, students design and build a model of a flood-proof home for their family on the fictitious isalnd of Watu. They will consider how flooding affects the whole community and work out where the best place for a home would be.

In this lesson, students take on the role of a quality analyst from a small independent quality control firm that checks results to ensure that they meet the requirements of the UK Environment Agency. The test involves adding an acidic solution of iron(III) chloride to the water sample and measuring the concentration of thiocyanate photometrically by measuring the absorbance due to the iron(III) thiocyanate complex.

This diagram shows the relationship between the nuclear binding energy of an isotope and its atomic mass.

Although bioinformatics usually involves huge computers and sequencing machines, the methods of this new science can be presented by means of simple classroom activities to be carried out with pencil and paper. The author of this activity challenges us with the building of the family tree of humans and other primates on the basis of the genetic differences between short (fake) DNA sequences. The proposed activity can be profitably (and enjoyably) exploited in secondary schools to address some tricky biology topics such as the use of molecular clocks in the study of evolution.

Part of NCSSM CORE collection: This is the student document for the bleach analysis lab.

Part of NCSSM CORE collection: This animation shows the rotation around a single bond in a molecule.

Students "breed" baby dragons using paper chromosomes to determine the genotype and phenotype.