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5 Written questions

5 Matching questions

  1. Molar mass
  2. J J Thompson
  3. Nucleus
  4. Cathode-ray-tube
  5. Law of Definite Proportions
  1. a the tiny, dense central portion of an atom, composed of protons and neutrons
  2. b 1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
  3. c the mass in grams of 1 mol of a substance
  4. d the fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
  5. e evacuated glass tube in which a stream of electrons emitted by a cathode strikes a fluorescent material, causing it to glow(used to discover the electron)

5 Multiple choice questions

  1. the weighted average of the atomic masses of the naturally occurring isotopes of an element
  2. from his gold foil expirments, he knew some substances give off + charged particles called alpha particles, most of the mass of an atom is in the nucleus, he reasoned that electrons in the atom are whirled around outside the nucleus, most of the atom is empty space
  3. 1700s-1800s 1. elements are composed of tiny indivisible perticles called atoms 2. atoms of the same element are the same, and atoms of different elements are different 3. atoms can chemically combine in simple whole number ratiosto form compounds 4. chemical reactions occur when atoms are separated, joined or rearranged
  4. the smallest particle of an element that retains its identity in a chemical reaction
  5. number of representative particles in a mole, 6.02 X 10^23

5 True/False questions

  1. Law of Multiple Proportionsif two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers


  2. Plum Pudding Model of the atomcreated by Ernest Rutherford. Replaced the Plum Pudding Model. Atom is like a miniature solar system with the positive particles in the middle and the negative particles orbiting as the planets do around the center.


  3. Law of Conservation of Massthe law that states that mass cannot be created or destroyed in ordinary chemical and physical changes


  4. James Chadwickconfirmed the existence of the neutron


  5. Scanning Tunneling Microscopes(STM)a powerful force of attraction that binds protons and neutrons together in the nuleus