Food manufacturers often add preservatives to food products to keep them fresh. The purpose of these preservatives is to kill microbes that could break down and otherwise spoil the food. Common additives like sugar, salt, ...
Molecular & Computational biology
Feb 3, 2024
1
818
"Eco-friendly" paper drinking straws contain long-lasting and potentially toxic chemicals, a new study has concluded.
Environment
Aug 24, 2023
6
4379
A South Dakota museum has closed after almost 40 years over concerns that the chemicals in its taxidermy collection could endanger visitors and staff, the affiliated zoo announced Thursday.
Paleontology & Fossils
Aug 19, 2023
3
448
A study zooms in on data that NASA's Cassini gathered at Saturn's icy moon and finds evidence of a key ingredient for life and a supercharged source of energy to fuel it.
Astrobiology
Dec 14, 2023
6
610
The plastic with which we surround ourselves contains a range of chemical additives that can leach out into water systems in the natural environment. This can happen both before and during the plastic degradation process. ...
Plants & Animals
Dec 21, 2023
3
820
When the Hunga Tonga-Hunga Ha'apai volcano erupted on January 15, 2022 in the South Pacific, it produced a shock wave felt around the world and triggered tsunamis in Tonga, Fiji, New Zealand, Japan, Chile, Peru and the United ...
Earth Sciences
Nov 20, 2023
4
1271
The chemical industry took a page out of the tobacco playbook when they discovered and suppressed their knowledge of health harms caused by exposure to PFAS (per- and polyfluoroalkyl substances), according to an analysis ...
Environment
Jun 1, 2023
2
830
A collaborative research team lead by the University of Massachusetts Amherst has recently revealed that rotifers, a kind of microscopic zooplankton common in both fresh and ocean water around the world, are able to chew ...
Environment
Nov 9, 2023
2
325
A research team headed by chemists at the University of California, Irvine has discovered a previously unknown way in which light interacts with matter, a finding that could lead to improved solar power systems, light-emitting ...
Optics & Photonics
May 7, 2024
1
227
Using the CARMENES spectrograph, astronomers have found evidence of water vapor in the atmosphere of a hot Saturn exoplanet designated HD 149026 b, dubbed Smertrios. The finding, reported in a research paper published on ...
cept
A chemical substance is a material with a specific chemical composition.
A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Some typical chemical substances are diamond, gold, salt (sodium chloride) and sugar (sucrose). Generally, chemical substances exist as a solid, liquid, or gas, and may change between these phases of matter with changes in temperature or pressure. Chemical reactions convert one chemical substance into another.
Forms of energy, such as light and heat, are not considered to be matter, and thus they are not "substances" in this regard.
This text uses material from Wikipedia, licensed under CC BY-SA
