In chemical reactions, atoms are combined, separated, or rearranged. Daltons atomic theory explains that the Law of Conservation of Mass is due to chemical reactions involving just the combination, separation, or rearrangement of atoms while during the process they are not created nor destroyed. ... "Lavoisier heated mercury in the retort (pictured below) for several days until its whole surface was covered with red particles. ... In 1897 English physicist Joseph John Thomson carried out a series of experiments using a cathode-ray tube (pictured below). ... When the scientists checked for the...

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• Grade Level: High School

This includes five basic principles; 1) all matter is made of indivisible and indestructible atoms, 2) atoms of a given element are identical in their physical and chemical properties, 3) atoms of different elements have different physical and chemical properties, 4) atoms of different elements combine in simple whole-number ratios to form chemical compounds, 5) atoms cannot be subdivided, created or destroyed when they are combined, separated, or rearranged in chemical reactions. ... In the result of this action a plot of equations provides a three dimensional picture of the electron cloud. ...

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Important Facts the smallest unit of life is the cell instructions for development are contained in DNA collectively, all of the chemical processes in a cell are called metabolism producers often obtain energy from the sun homeostasis refers to the ability to maintain a constant internal environment cells in domains archaea and eubacteria lack nucleii plants are multicellular producers an educated guess might be called a hypothesis science is based on evidence philosophy is not a step in the scientific method an atom is the smallest unit of substance that retains the properties of the subst...

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The Nobel Prize in Chemistry, 2000: Conductive polymers Contents Prize motivation 1 Conductive polymers - a surprising discovery 1 What is electrical conductivity? 2 What makes a material conductive? 3 Conductive polymers - the story 4 Applications of conductive polymers 5 Synthesis and p...

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In 1936, he made another major advance in atomic physics: he gave the first correct description of a nuclear reaction. ... Rutherford's model of the atom pictured negatively charged electrons moving in circular orbits around a positively charged nucleus. ...

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