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30 Cards in this Set
- Front
- Back
Who was Antoine Lavoisier?
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French Chemist, no change in mass during common chemical reactions, such as: burning and rusting.
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Electron
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Negatively charged particles that are the lightest of the three main particles found in an atom.
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Compound
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A form of matter that is made when two or more elements combine.
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What is an example of a compound?
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H2O - Water which is Oxygen and Hydrogen combined.
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How is a compound represented?
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By a chemical formula.
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Mixture
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Two or more substances put together that DO NOT combined to form a compound.
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What is an example of a mixture?
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Air - which contains oxygen, nitrogen and other gases.
Another example: rocks |
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What is Mass?
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Amount of matter in an object.
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Can Mass change?
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NO, Mass cannot change.
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What is a Proton?
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A positively charge particle located in the nucleus of an atom.
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ATOM
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An extremely small partical that is the basic unit of matter and is composed mainly of protons, neutrons and electrons.
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Democritus
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Greek philosopher who found out what an atom is and called it "stuff"
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Synthetic Element
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NOT an element found in nature. A synthetic element is man-made by a particle accelerator.
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How many synthetic elements are there?
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21
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Natural Element
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An element found in nature. Example: copper, hydrogen, sodium, iodine
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How many natural elements?
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91
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John Dalton
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English chemist that introduced a model to describe matter and atoms.
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Element
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Matter made up of only one type of atom. Example: gold
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How many elements are there?
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112
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Model
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A smaller or larger version of something.
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Neutron
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A particle with NO charge.
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Nucleus
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The center of an atom which is made up of protons and neutrons.
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Particle Accelerator
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Machines that make synthetic elements.
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Chemical Formula
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Is made up of symbols and numbers that tell what elements are in a compound and what their ratios are.
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Joseph Proust
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French chemist, he stated that the basic building blocks of any substance are always the same.
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Matter
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used to describe anything that has mass and takes up space. Examples: Air, trees, buildings, people
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Is heat and light a form of matter?
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Heat and light are not a form of matter.
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Periodic Table
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A chart that organizes elements by the number of PROTONS in each elements nucleus. This also indicates if a element is a solid, liquid or gas.
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Dimitri Mendeleev
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Russian chemist who made the periodic table.
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Why do some elements have a three letter abbreviation?
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Until scientists around the world agree on the element it has a 3 letter abbreviation and then when agreed upon gets a 2 letter abbreviation.
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