Flashcards
Chemistry CH 3
Flashcards do conjunto (28)
- 1mass is neither created or destroyedlaw of conservation of mass
- 2discovered the atomDemocritus
- 3didn’t believe in the atom and believe that all matter was continuousAristotle
- 4every chemical compound has the same proportion of mass by compoundsLaw of Definite Proportion
- 52 chemical compounds combine to form more than one compound the weight of one element when combined with a set weight are written in a small whole number ratioLaw of Multiple Proportions
- 6the smallest particle of an element that maintains is chemical propertiesAtom
- 7What are the sub atomic particlesprotons, neutrons, and electrons
- 8Who came up with the atomic theoryDalton
- 9What scientist concluded that particles that compose cathode rays are negative?Joseph John Thomso
- 10Who discovered the charge of an electron?Millikan
- 11Who proposed the plum pudding model where the electrons and protons were evenly distributed and didn’t maintain much mass?Thomson
- 12Who did the gold foil experiment and who were his assistants?Main- Rutherford, Help-Geiger and Marsden
- 13What happened in the gold foil experiment?Some particle bounced straight back
- 14who discovered the neucleusRuthford
- 15What subatomic particle determines an element's identity?protons
- 16hold nuclear particles togetherNuclear Forces
- 17What is the relative charge and Mass Number of each of the subatomic particles?P- RC:1 MN:1
N- RC:0 MN:1
E- RC:-1 MN:0 - 18What is the region occupied by the electrons called?Electron Cloud
- 19Distance from the center to the outside of the electron cloudRadii of an atom
- 20Number of protonsAtomic Number
- 21atoms of same element that have different numbers of massesIsotopes
- 22total number of protons and neutronsMass Number
- 23indicates the mass number and is written like this; uranium-235Hyphen Notation
- 24indicates the mass number on top and the number of protons on the bottom and is written like this; 235/92 UNuclear Symbol
- 251 u is exactly 1/12 the mass of a barnon-12 atomUnified Atomic Mass Unit
- 26weighted average of all the isotopesAverage Atomic Mass
- 27amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12Mole
- 28the mass of one mole of a pure substancemolar mass
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- FlashCards sobre Chemistry CH 3, criado por Savannah Lamar em 04-10-2021.
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- Savannah Lamar
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