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Organic Compounds03:02

Organic Compounds

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
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Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
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Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 
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Dependence of drivers affects risks associated with compound events.

Jakob Zscheischler1, Sonia I Seneviratne1

  • 1Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland.

Science Advances
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Compound climate extremes like hot and dry summers are more frequent than expected. A multivariate approach is crucial for accurate risk assessment and adaptation planning.

Keywords:
CMIP5Climate ChangeClimate extremescompound eventsrisk

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Area of Science:

  • Climate Science
  • Environmental Science
  • Risk Assessment

Background:

  • Compound climate extremes are increasingly recognized for their significant impacts.
  • Current risk assessments often rely on univariate statistics, potentially overlooking compound events.

Purpose of the Study:

  • To analyze the co-occurrence of hot and dry summers.
  • To highlight the underestimation of risks when using univariate statistics for compound extremes.

Main Methods:

  • Statistical analysis of the dependence structure between hot and dry summer occurrences.
  • Comparison of observed frequencies with those predicted by independent univariate statistics.

Main Results:

  • Hot and dry summers are significantly correlated, leading to a higher frequency of concurrent events than predicted by independent statistics.
  • Univariate assessments can substantially underestimate the actual risks of compound climate extremes.

Conclusions:

  • A multivariate perspective is essential for accurately assessing climate extreme risks and impacts.
  • Understanding variable dependence is key to designing effective adaptation strategies for compound climate events.