Acids and Bases

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  • Created by: alana
  • Created on: 10-11-12 02:52

1. What is Particle Theory

  • The theory that matter is made up of tiny particles which are constantly moving
  • The theory that in order for a chemical reaction to occur two or more particles must collide with sufficient energy and at the correct orientation
  • is the measure of how much there is of a given substance
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2. What is a nucleus

  • The centre of an atom composed of protons and neutrons, possessing 99.9% of the mass
  • the centre of a n atom composed of protons and neutrons, possessing 90% of the mass
  • The centre of an atom composed of protons and neutrons possessing 89.9% of the mass

3. What is the atomic number

  • The number of electrons in the nucleus of an atom. Places it on the periodic table
  • The number of protons in the nucleus of an atom. Places it on the periodic table
  • The number of neutrons in the nucleus of an atom. Places it on the Periodic table

4. What is a catalyst?

  • is the defining structure of an element. cannot be broken by any chemical means
  • a substance that speeds up a chemical reaction but is not used up in that reaction
  • least amount of energy required to start a chemical reaction

5. Element

  • A substance composed of two or more elements
  • A class of substances that cannot be seperated into simpler substances by chemical means
  • A group of atoms or an electrically charged atom formed by the loss or gain of one or more electrons
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