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Einführung: Materie und Messung

Naturwissenschaftliche Gesetze und Theorien
In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It…
Die naturwissenschaftliche Methode
Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions.…
Klassifizierung von Materie nach Zustand
Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air,…
Klassifizierung von Materie nach Zusammensetzung
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.  A pure substance…
Physikalische und chemische Eigenschaften von Materie
The characteristics that enable us to distinguish one substance from another are called properties. A physical property is a characteristic of…
Was ist Energie?
The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate…
Messung: Standardeinheiten
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the…
Messung: Abgeleitete Einheiten
The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length,…
Messunsicherheit: Genauigkeit und Präzision
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the…
Messunsicherheit: Ablesen von Instrumenten
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process.…
Messunsicherheit: Signifikante Zahlen
All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a…
Dimensionsanalyse
Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this…
Design und die Verwendung eines Vollstrom-Probenahmesystem (FFS) für die Quantifizierung von Methanemissionen
Der Einsatz von Erdgas weiterhin mit erhöhter Entdeckung und Produktion von unkonventionellen Schieferressourcen zu wachsen. Zur gleichen Zeit…
Trennung von Aldehyden und reaktive Ketone von Mischungen mit einem Bisulfit-Extraktion-Protokoll
Die Reinigung von organischen Verbindungen ist ein wesentlicher Bestandteil der synthetischen Routineoperationen. Die Fähigkeit, Schadstoffe in eine…

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