A change is called irreversible if it cannot be changed back again. Many chemical reactions are irreversible. In a chemical reaction, new materials are always formed. Sometimes these new materials ...

Can be used to recap on tritation or could lead into a classroom discussion on chemical changes and structures.

Students explore the concept that chemical reactions involve the breaking of bonds between atoms in the reactants, and the rearrangement and rebonding of these atoms to make the products. Students ...

Both chemical changes generating electric currents and chemical reactions triggered by the passage of electricity can be considered electrochemical reactions. Mixed conductors streamline ion and ...

The lesson can also be used to lay a foundation for learning about changes in state and chemical changes which can be further developed in later grades. If water is cooled enough it can change to ice.

The way the body ages could be more resilient than previously thought, a new study suggests.