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 ...

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

The research could contribute to the development of more effective anti-aging treatments in the future. The body's aging ...

The speed of a chemical reaction is affected by temperature, concentration, particle size and the presence of a catalyst. It can be calculated by measuring changes in reactants/products.

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.

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 ...

In the middle of the eighteenth century the attempt was made to explain in a general way that most striking of all ordinary chemical changes, namely, fire or combustion. It was noticed that there ...

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 ...

A new law designed to increase public awareness of hazardous chemical spills will have little change on how authorities in McLeod County react to such emergencies.