Category Archives: Chemistry

AQA Unit 2 Chemistry. Acids, bases and salts Lesson 3: Acid + Insoluble base Free GCSE and A Level video lessons. By: Freesciencelessons … Continue reading →

AQA Unit 2 Chemistry. Acids, bases and salts Lesson 4: Acid + Alkali Free GCSE and A Level video lessons. By: Freesciencelessons … Continue reading →

AQA Unit 2 Chemistry. Acids, bases and salts Lesson 5: Making insoluble salts Free GCSE and A Level video lessons. By: Freesciencelessons … Continue reading →

AQA Unit 2 Chemistry. Electrolysis Lesson 1: Introducing electrolysis Free GCSE and A Level video lessons. By: Freesciencelessons … Continue reading →

AQA Unit 2 Chemistry. Electrolysis Lesson 2: Electrolysis of aluminium oxide Free GCSE and A Level video lessons. By: Freesciencelessons … Continue reading →

AQA Unit 2 Chemistry. Electrolysis Lesson 3: Electrolysis of sodium chloride solution Free GCSE and A Level video lessons. By: Freesciencelessons … Continue reading →

A geostatistical approach for studying environmental conditions in stream networks and landscapes has been successfully applied at a valley-wide scale to assess headwater stream chemistry at high resolution, revealing unexpected patterns in natural chemical components. "Headwater streams make up the majority of stream and river length in watersheds, affecting regional water quality," said Assistant Professor Kevin J. McGuire, associate director of the Virginia Water Resources Research Center in Virginia Tech's College of Natural Resources and Environment. "However, the actual patterns and causes of variation of water quality in headwater streams are often unknown." "Understanding the chemistry of these streams at a finer scale could help to identify factors impairing water quality and help us protect aquatic ecosystems," said Gene E. Likens, president emeritus and distinguished senior scientist emeritus with the Cary Institute of Ecosystem Studies and the University of Connecticut. Results of the study that used a new statistical tool to describe spatial patterns of water chemistry in stream networks are published in the April 21 issue of the Proceedings of the National Academies of Science by a team of ecosystem scientists, including McGuire and Likens. The data used in the new analysis consist of 664 water samples collected every … Continue reading →

PUBLIC RELEASE DATE: 22-Apr-2014 Contact: Winsor Lowe winsor.lowe@umontana.edu 406-243-4375 The University of Montana MISSOULA Winsor Lowe, interim director of the University of Montana's Wildlife Biology Program, co-wrote a research paper published April 21 in the Proceedings of the National Academy of Sciences on how streamwater chemistry varies across a headwater stream network. Lowe and co-authors from Virginia Tech, the U.S. Geological Survey, the University of Washington, the Cary Institute of Ecosystem Studies, the University of Connecticut and the U.S. Forest Service Northern Research Station examined 664 water samples collected every 10 meters along 32 tributaries of a stream network in the Hubbard Brook Valley of New Hampshire. Lowe says this would be like looking at any of the Bitterroot Valley creeks by starting at its headwaters high in the mountains and sampling all the small streams that feed into the system as the stream makes its way down to the Bitterroot River. Headwater streams perform critical functions for downstream ecosystems, but the complexity of their streamwater chemistry is not well understood. Lowe and his co-authors' findings suggest that in headwater stream networks many factors influence the streamwater chemistry in different locations along the stream's course, and in complex relationships with … Continue reading →

Born in a disc of gas and rubble, planets eventually come together as larger and larger pieces of dust and rock stick together. They may be hundreds of light-years away from us, but astronomers can nevertheless watch these planets as they form. One major point of interest is the chemistry of the rubble that forms around a star before a planetary system is formed, known as the protoplanetary disc. The gas molecules that float in the disc could eventually become part of the atmosphere of the planets. If these molecules contain oxygen or nitrogen, the odds increase of a life-friendly planet forming. "It's very interesting to think about the molecular composition (of these discs)," said Catherine Walsh, an astronomer at Leiden Observatory in the Netherlands. "The molecules that are in those discs will make up the molecules in planetary atmospheres, and planetesimals such as comets." Walsh led a new study, "Complex organic molecules in protoplanetary disks," which was published in February 2014 in the journal Astronomy and Astrophysics. In the study, the astronomers modeled how complex molecules form in protoplanetary systems with the hopes of better understanding their observations. Seeking high definition observations Molecules in protoplanetary discs emit their light … Continue reading →

KClO3 + Glycerine + H2SO4. Chemistry Reaction TDV BTL Abbas Gursel, Suleymanov Serkhan, Nadirov Nadir. By: Tdvbtl Science … Continue reading →