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Chemistry

Chemistry Chap 4.1 - 4.2

QuestionAnswer
Dalton's Theory #1 All elements are composed of tiny INDIVISIBLE particles called atoms.
What are the three types of subatomic partics? protons, neutrons, electrons
Which subatomic particle has a negative charge? positive charge? neutral? protons= positive, electron= negative, neutrons= neutral
Which subatomic particles are found in the nucleus? protons and neutrons.
an atom the smallest particle of an element that retains its idenity in a chemical reaction.
electrons negatively charged subatomic particles.
Dalton's Theory #2 Atoms of the same element are IDENTICAL. Atoms of an element are DIFFERENT from atoms of any other element.
Dalton's Theory #3 Atom's of different elements can phyically mix and chemically combine in WHOLE-NUMBER RATIOS to form compounds.
scanning tunneling microscope instrument used to observe individual atoms
Democritus Greek philosopher who believed that matter was made of atoms, which were indivisible and indestructible.
J.J. Thomson Discovered the electron in experiments with cathode rays.
Who discovered that electrons were negatively charged? How did he learn this? J.J. Thomson. He found that negatively charged plates would repel a cathode ray.
cathode ray glowing beam of electrons
Robert A. Millikan Measured the quantity of charge of an electron and its mass.
mass of an electron 1/1840 of the mass of a hydrogen atom
Eugen Goldstein Discovered protons
James Chadwick Discovered neutrons
Ernest Rutherford Discovered the nucleus during gold-foil experiments.
Rutherford's model of the atom An atom is mostly empty space, with a dense nucleus with electrons moving around it.
Whose model of the atom is known as the plum-pudding model? Rutherford's
dalton's #4 chemical reactions occur when atoms are SEPARATED, JOINED, OR REARRANGED. Elements are never changed into another element in a chemical reaction.
Created by: phersont