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Leis e Teorias Científicas
In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It…
O Método Científico
Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions.…
Classificação da Matéria por Estado
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,…
Classificação da Matéria por Composição
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.  A pure substance…
Propriedades Físicas e Químicas da Matéria
The characteristics that enable us to distinguish one substance from another are called properties. A physical property is a characteristic of…
O que é 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…
Medição: Unidades Padrão
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the…
Medição: Unidades Derivadas
The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length,…
Incertezas na Medição: Exatidão e Precisão
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the…
Incertezas na Medição: Instrumentos de Leitura
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process.…
Incertezas na Medição: Valores Significativos
All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a…
Análise Dimensional
Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this…
Concepção e utilização de um sistema de amostragem total do fluxo (FFS) para a quantificação das emissões de metano
The use of natural gas continues to grow with increased discovery and production of unconventional shale resources. At the same time, the natural gas…
Separação de aldeídos e cetonas reativas de misturas usando um protocolo de extração de bissulfito
The purification of organic compounds is an essential component of routine synthetic operations. The ability to remove contaminants into an aqueous…

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