Key question #5 - Lesson 5 Key Questions 21 a 1 All...

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Lesson 5 Key Questions 21) a) 1) All substances are made up of tiny, indivisible particles. 2) Each chemical element is composed of its own kind of particles, called atoms. 3) The atoms of a given element are alike and have the same mass. The atoms of different elements differ in mass and properties. 4) Atoms cannot be created or destroyed during physical or chemical changes. 5) Atoms unite in simple whole-number ratios to form compounds. b) There are a few problems with his theory such as: atoms can be created or destroyed by the process of fission and fusion and at that time nobody knew the size of an atom or the number of atoms in a particular substance. Also most element don’t all have the same masses. These elements may have a different amounts of neutron within that element. The more or less neutrons within a certain element will affect the mass of that atom. c) Dalton’s theory was an excellent starting point for today’s modern atomic theory. Dalton stated that the atoms of a given element are alike and have the
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