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Capitolo 1
Leggi e teorie scientifiche
In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It…
Il metodo scientifico
Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions.…
Classificazione della materia per stato
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,…
Classificazione della materia per composizione
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.  A pure substance…
Proprietà fisiche e chimiche della materia
The characteristics that enable us to distinguish one substance from another are called properties. A physical property is a characteristic of…
Cos'è l'energia?
The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate…
Misure: unità standard
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the…
Misure: unità derivate
The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length,…
Incertezza nella misurazione: accuratezza e precisione
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the…
Incertezza nella misurazione: strumenti di lettura
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process.…
Incertezza nella misurazione: cifre significative
All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a…
Analisi dimensionale
Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this…

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