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 ...

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 ...

Instead, the atoms rearrange themselves to form new chemicals. This is known as a chemical change. The other kind of change in chemistry is a physical change, which is when a substance changes ...

The White House announced a new executive order signed by President Trump on Tuesday to "protect[] children from chemical and ...

Students will be able to make measurements showing that whether the process is a change of state, dissolving, or a chemical reaction, the total mass of the substances does not change. Note: In the ...

WASHINGTON — President Trump signed an Executive Order Tuesday evening banning federal money from going toward child ...

An effort is underway to convince Georgia’s Environmental Protection Division that changes to a chemical plant’s permit will ...

Thanks to research in his lab, Buchholz has learned that several hormones interact to make changes in tadpoles. They found this out by trying to halt one chemical, but nothing changed.

The order, titled "Protecting Children from Chemical and Surgical Mutilation," aims to end what Trump calls a dangerous trend ...