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Quiz

C371 Unit 3

eli corniel 27 perguntas

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Perguntas do quiz (27)

  1. 1Analysis of which pair of substances could be used to illustrate the law of multiple proportions?
    1. ASO2 , H2SO4
    2. BCrF2, CrF3
    3. CH2O , O2
    4. DNaCl , KCl
  2. 2A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. This is a statement of __________.
    1. Athe law of multiple proportions
    2. Bthe law of constant composition
    3. Cthe law of conservation of mass
    4. Dthe law of conservation of energy
  3. 3Which one of the following is NOT one of the postulates of Dalton's atomic theory?
    1. AAtoms are composed of protons, neutrons, and electrons.
    2. BAll atoms of a given element are identical; the atoms of different elements are different and have different properties.
    3. CAtoms of an element are not changed into different types of atoms by chemical reactions: atoms are neither created nor destroyed in chemical reactions.
    4. DCompounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms.
  4. 4Which of the following is NOT true concerning cathode rays?
    1. AThey originate from the negative electrode called the cathode
    2. BThey would not be visible if there were no gas at all in the tube
    3. CThe characteristics of cathode rays depend on the material from which they are emitted.
    4. DThey travel in straight lines in the absence of electric or magnetic field
  5. 55. Isotopes are atoms that have the same number of ____ but different number of ______
    1. Aprotons, electrons
    2. Bneutrons, protons
    3. Cprotons, neutrons
    4. Delectrons, protons
  6. 6Which statement below correctly describes the responses of alpha, beta, and gamma radiation to an electric field?
    1. ABoth beta and gamma are deflected in the same direction, while alpha shows no response.
    2. BBoth alpha and gamma are deflected in the same direction, while beta shows no response.
    3. CBoth alpha and beta are deflected in the same direction, while gamma shows no response.
    4. DAlpha and beta are deflected in opposite directions, while gamma shows no response.
  7. 7Which of the following is a correct interpretation of the results of Rutherford’s experiments in which gold atoms were bombarded with alpha particles?
    1. AElectrons in atoms are negative.
    2. BAtoms consist mostly of empty space
    3. CThe positive charge of an atom is found in a small dense region.
    4. DElectrons are attracted to the heavy positively charged alpha particles.
  8. 8The charge on the electron, was determined in the ____
    1. Acathode ray tube, by J.J. Thomson.
    2. BRutherford gold foil experiment.
    3. CMillikan oil drop experiment.
    4. DDalton atomic theory.
  9. 9All isotopes of a particular element must have the same
    1. Amass
    2. Bnumber of protons
    3. Cnumber of neutrons
    4. Dnumber of protons and neutrons
  10. 1010. There are ______ electrons, _______ protons, and ______ neutrons in an atom of 134/54 Xe
    1. A54, 54, 78
    2. B54, 54, 77
    3. C54, 54, 132
    4. D78, 78, 54

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Quiz sobre C371 Unit 3 , criado por eli corniel em 04-10-2021.
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