Loading...
  • Questions
  • Nitrogen and sulfur quiz has multiple choice questions (MCQ), environmental problems caused by nitrogen compounds and nitrate fertilizers quiz questions and answers as which option is incorrect a bloom of algae, answer key with choices as provides food for aquatic life, blocks sunlight for aquatic life, utilize oxygen in water leaving lesser oxygen for rest of water life and forms a layer over water surface for competitive exam prep. (mcqslearn.com)
  • Free study guide is to learn environmental problems caused by nitrogen compounds and nitrate fertilizers quiz online with MCQs to practice test questions with answers. (mcqslearn.com)
  • covalent
  • Helium has a complete shell of electrons, and in this form the atom does not readily accept any extra electrons or join with anything to make covalent compounds. (wikipedia.org)
  • In fact, the 5f subshells of the actinides have a larger spatial extent than the 4f orbitals of the lanthanides and thus actinide compounds have greater covalent character than the corresponding lanthanide compounds, leading to a more extensive coordination chemistry for the actinides than the lanthanides. (wikipedia.org)
  • known
  • This provides unique coverage of information on compounds isolated from some 3,000 plants, including many from central Asia and Russia, that are not well known elsewhere. (springer.com)
  • A mixture of PCBs such as Aroclor may contain PCB compounds which are known estrogen agonists , but on the other hand are not classified as dioxin-like in terms of toxicity. (wikipedia.org)
  • Joint compound (also known as drywall compound or Mastic) is a white powder of primarily gypsum dust mixed with water to form a mud the consistency of cake frosting, which is used with paper or fiber joint tape to seal joints between sheets of drywall to create a seamless base for paint on interior walls. (wikipedia.org)
  • Numerous quaternary compounds (with four elements) of nickel have been studied for super conductivity properties, as nickel is adjacent to copper and iron in the periodic table can can form compounds with the same structure as the high-temperature superconductors that are known. (wikipedia.org)
  • Buprenorphine and etorphine are perhaps the best known of the family, which was the first series of extremely potent μ-opioid agonists, with some compounds in the series having over many thousands of times the analgesic potency of morphine. (wikipedia.org)
  • Many compounds of thorium are known: this is because thorium and uranium are the most stable and accessible actinides and are the only actinides that can be studied safely and legally in bulk in a normal laboratory. (wikipedia.org)
  • Californium is the second-heaviest element for which an organometallic compound is known. (wikipedia.org)
  • The number of organic compounds is immense and the known number of defined compounds is close to 10 million. (wikipedia.org)
  • polycyclic
  • TCDD binding to the AH receptor induces the cytochrome P450 1A class of enzymes which function to break down toxic compounds, e.g., carcinogenic polycyclic hydrocarbons such as benzo (a) pyrene (but making many of them more toxic in the process). (wikipedia.org)
  • helium
  • Helium is the most unreactive element, so it was commonly believed that helium compounds do not exist at all. (wikipedia.org)
  • Helium has been shown to form a crystalline compound with sodium under pressure. (wikipedia.org)
  • Na2He is a compound of helium and sodium that is stable at high pressures above 113 gigapascals (1,130,000 bar). (wikipedia.org)
  • antimony
  • Non-stoichiometric compounds of nickel with phosphorus, arsenic and antimony exist, and some are found in nature. (wikipedia.org)
  • The compounds are almost insoluble in water, weak acids, and (NH4)2S/(NH4)2S2 solution is the key for separation of lead from analythical groups I to III elements, tin, arsenic, and antimony. (wikipedia.org)
  • heterocyclic
  • Chemistry of Heterocyclic Compounds publishes articles, letters to the Editor, reviews, and minireviews on the synthesis, structure, reactivity, and biological activity of heterocyclic compounds including natural products. (springer.com)
  • occurrence
  • Organosulfur compounds can be classified according to the sulfur-containing functional groups , which are listed (approximately) in decreasing order of their occurrence. (wikipedia.org)
  • Each volume systematically covers occurrence of the compounds in plants, illustrations of chemical structures plus physical-chemical, spectral, and pharmacological data. (springer.com)
  • The entries are preceded by tabulated information on the occurrence of the compounds in plants etc. (springer.com)
  • hexagonal
  • He(N2)11 is a van der Waals compound with hexagonal crystals. (wikipedia.org)
  • They convert to a monoclinic form upon heating to about 1400 °C and melt at 1750 °C. Californium(III) chloride (CfCl3) is an emerald green compound with a hexagonal structure that can be prepared by reacting Cf2O3 with hydrochloric acid at 500 °C. CfCl3 is then used as a feeder stock to form the yellow-orange triiodide CfI3, which in turn can be reduced to the lavender-violet diiodide CfI2. (wikipedia.org)
  • Examples
  • Examples of triphenyltins include: Triphenyltin hydride, Ph3SnH Triphenyltin hydroxide, Ph3SnOH Triphenyltin chloride, Ph3SnCl Triphenyltin acetate, Ph3SnOAc Triphenyltin compounds have been used extensively as algicides and molluscicides in antifouling products since the 1960s, together with tributyltin compounds, and both these classes of compounds are of local (but not global) environmental concern because they are persistent organic pollutants. (wikipedia.org)
  • CS1 maint: Uses authors parameter (link) Examples of inorganic bridged compounds. (wikipedia.org)
  • structures
  • Zinc compounds are noteworthy for their nondescript behavior, they are generally colorless, do not readily engage in redox reactions, and generally adopt symmetrical structures. (wikipedia.org)
  • Zinc sulfide, ZnS, crystallizes in two closely related structures, the zincblende crystal structure and the Wurtzite crystal structure, which are common structures of compounds with the formula MA. (wikipedia.org)
  • form
  • The fact that they can be joined to form water, a substance used for putting out most kinds of fires, illustrates the types of changes elements undergo when they join to form compounds. (encyclopedia.com)
  • Ready-mix lightweight joint compound is a pre-made form of joint compound designed for fast application and easy maintenance. (wikipedia.org)
  • Setting type joint compounds come in powder form and are mixed with water immediately before use. (wikipedia.org)
  • biological
  • The pluripotency of biological compounds describes the ability of certain substances to produce several distinct biological responses. (wikipedia.org)
  • yearly
  • The number of proteins mapped to compounds on a yearly basis shows less decline, indicating the cumulative published target capacity of global research is being sustained in the region of 300 proteins for large companies. (drugpatentwatch.com)
  • The yearly compounded rate is higher than the disclosed rate. (wikipedia.org)
  • mixture
  • The delicate mixture of compounds gives it a creamy texture that spreads easily onto drywall surfaces and then hardens as the moisture evaporates. (wikipedia.org)
  • Chemistry
  • The highly experienced team of compilers from the renowned Institute of the Chemistry of Plant Substances in Tashkent have expertly assessed the international literature and include data only when confident of its validity, e.g. excluding data where measurement processes cause degradation of the original compound. (springer.com)
  • alkynyl
  • Reactions of alkenyl- and alkynylaluminium compounds involve the transfer of a nucleophilic alkenyl or alkynyl group attached to aluminium to an electrophilic atom. (wikipedia.org)
  • behavior
  • Many cytokines are pluripotent, in that each of these compounds can activate specific behavior in some cell types and inhibit other behavior in other cell types. (wikipedia.org)
  • effectively
  • In the present study, using a combination of druggability simulations, pharmacophore modeling, virtual screening, and in vitro fluorescence measurements to probe peroxidase activity, we identified three repurposable drugs and seven compounds that are validated to effectively inhibit the peroxidase activity of cyt c . (aspetjournals.org)
  • When used for new walls, joint compound effectively eliminates all blemishes from the surface of the drywall, such as fasteners, damage, or drywall tape. (wikipedia.org)
  • make
  • Elements make up compounds, and although there are only about 90 elements that occur in nature, there are literally many millions of compounds. (encyclopedia.com)
  • None of these is sweet, yet when they are brought together in just the right way, they make the compound that sweetens everything from breakfast cereals to colas. (encyclopedia.com)
  • A collection of visually stimulating and informative infographics about everyday compounds, which would make a valuable addition to any science classroom. (rsc.org)
  • The flexibility and plastic qualities of joint compound make it a very versatile material both as sealer or finishing coat for wall surfaces, and also in decorative applications that range from machine sprayed texturing to hand-trowelled or even hand-crafted and sculptural finishes. (wikipedia.org)
  • class
  • The latter three compounds represent a special class of sulfur-containing heterocycles that are aromatic . (wikipedia.org)
  • Because dioxins refer to such a broad class of compounds that vary widely in toxicity, the concept of toxic equivalency factor (TEF) has been developed to facilitate risk assessment and regulatory control. (wikipedia.org)
  • The Bentley compounds are a class of semi-synthetic opioids that were first synthesized by K. W. Bentley by Diels-Alder reaction of thebaine with various dienophiles. (wikipedia.org)
  • neon
  • This neon comes back out when heated to 900 °C. Neon can be trapped inside some metal-organic framework compounds. (wikipedia.org)
  • bonds
  • These compounds are characterized by C−S−C bonds Relative to C−C bonds, C−S bond are both longer, because S is larger than carbon, and about 10% weaker. (wikipedia.org)
  • various
  • A similar compound is used in various ways as a sprayed-on textural finishing for gypsum panel walls and ceilings that have been pre-sealed and coated with joint compound. (wikipedia.org)