We categorise reactions by the direction of this energy change. If energy is released by a reaction, the reaction is exothermic. If energy is absorbed by a reaction, the reaction is endothermic. When ...

A presenter-led science video investigating exothermic and endothermic reactions, with Dr Maggie Aderin-Pocock and Dr Alex Lathbridge.

Amongst the many global efforts to enhance energy efficiency, cooling systems are seen by many as one of the best places to focus efforts. Cooling systems like your refrigerator and air conditioning ...

Substitution reactions are fundamental in organic chemistry, demonstrating how molecules can be transformed into different structures. In a substitution reaction, one functional group in a compound is ...

New ceramic catalyst uses sodium and boron to drive sustainable industrial reactions Researchers create a sodium-doped form of amorphous silicon-boron-nitride catalyst that may enable more ...

Allergies are an immune system reaction to substances called allergens. The cause a range of symptoms from a stuffy nose to itchy eyes to difficulty breathing. How long allergies last varies based on ...

Quick reactions and selfie stickers have been added to make responding and creating stickers easier. The first update comes to the camera effects feature, which is now expanding the tools ...

A biochemical reaction is the transformation of one molecule to a different molecule inside a cell. Biochemical reactions are mediated by enzymes, which are biological catalysts that can alter the ...

Reactions to a recent immunization (vaccine) Most are reactions at the shot site (such as pain, swelling, redness) General reactions (such as a fever or being fussy) may also occur ...

After a federal ban took effect preventing Americans from using TikTok, thousands posted on X and other platforms to share their (often hilarious) reactions Brenton Blanchet is a writer-reporter ...