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Chemistry - The Atom

Number of questions: 44

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1) The alpha particle scattering experiment was carried out by:
  1. Goldstein
  2. J. Chadwick
  3. J.J. Thomson
  4. Rutherford
 2) Which sequence lists a nonmetal, metalloid and a transition metal, respectively?
  1. Al, As, Ag
  2. Co, Pb, P
  3. N, Si, Fe
  4. O, Ge, Cs
 3) Which statement below correctly describes the responses of alpha, beta, and gamma radiation in an eletric field?
  1. Beta and alpha rays are deflected in opposite directions while gamma rays show no response
  2. Both alpha and beta rays are deflected in opposite directions while gamma rays show no response
  3. Both alpha and gamma rays are deflected in the same direction while beta rays show no response
  4. both beta and gamma rays are deflected in the same direction while alpha rays show no response
 4) Dalton said that elements are different distinguished from each other by:
  1. The density of their solid forms
  2. the charge on their ions
  3. the shapes of their atoms
  4. the weights of their atoms
 5) The name of the ionic compound KBrO4 is
  1. Potassium Perbromite
  2. Potassium bromate
  3. Potassium hypobromate
  4. Potassium perbromate
 6) Which of the following is a metal?
  1. S
  2. Se
  3. Si
  4. Sr
 7) Which radiation type has no detectable charge?
  1. Alpha
  2. Beta
  3. Both alpha and gamma
  4. Gamma
 8) _____rays are a stream of fast-moving electrons.
  1. Alpha
  2. Beta
  3. Gamma
  4. None of these
 9) Which ion has the wrong charge?
  1. Ba2+
  2. Cs1+
  3. Te2-
  4. Xe1-
 10) Which one of the following incorrectly labeled?
  1. Ca; alkaline earth metal
  2. I; halogen
  3. Mg; alkali metal
  4. Rn; noble gas
 11) Water, no matter where it is found, consists of hydrogen and oxygen combined in a 1:18 ratio by mass. This is a statement of
  1. the law of conservation of energy
  2. the law of conservation of mass
  3. the law of constant composition
  4. the law of multiple proportions
 12) Which one of the following is improperly labeled?
  1. Ba; alkaline earth metal
  2. I; chalcogen
  3. Kr; noble gas
  4. Na; akali metal
 13) According to Rutherford, the atom consists of the following two parts:
  1. Electrons and Protons
  2. Neutrons and Electrons
  3. Protons and Neutrons
  4. nucleus and the extra-nuclear part
 14) An element in the lower left corner of the periodic table
  1. is definitely a metal
  2. is definitely a nonmetal
  3. is either a metal or metalloid
  4. is either a metalloid or a nonmetal
 15) A certain number of electrons has a total charge of~ 1.1x10 to the negative 18C. How many electrons are there?
  1. 1
  2. 2
  3. 4
  4. 7
 16) Which of the following should be the most similar in chemical property to strontium?
  1. At
  2. Ba
  3. Li
  4. Rb
 17) The ray of light within a neon sign bends when a magnet is held up to it because
  1. impurities within the neon plasma are attracted to the magnet
  2. magnetic fields are able to pass through glass
  3. neon, like iron, is attracted to magnets
  4. the light arises from the flow of electron within the tube
 18) How many protons and neutrons are ther in 98/43Tc?
  1. 43 protons and 55 neutrons
  2. 49 protons and 98 neutrons
  3. 55 protons and 43 neutrons
  4. 98 protons and 43 neutrons
 19) The element zinc consists of five isotopes with masses 63.929, 65.926, 66.927, 67.925 amu. The relative abundances of these five isotopes are 48.89, 27.81, 4.110, 18.57, and 0.62 percent, respctively. From these data calculate the average atomic mass of zinc.
  1. 65.387 amu
  2. 65.39 amu
  3. 66.927 amu
  4. 66.93 amu
 20) Groups in the periodic table are also known as:
  1. Chemical Families
  2. IUPACs
  3. Periods
  4. assemblages
 21) Which of the following compounds is not a possible ionic compound?
  1. Cs2O
  2. GaF3
  3. NaF2
  4. SrO
 22) If 60g of carbon combine with 10g of hydrogen to form a compound, this means that any sample of this compound will contain ____ part(s) and ____ part(s) hydrogen by mass.
  1. 0.17
  2. 6, 1
  3. 5, 1
  4. 5, 10
 23) An elemental ion has 22 protons, 20 electrons, and 26 neutrons. Which isotope is it?
  1. (47)26Fe
  2. (48)26Ti
  3. 48(22)Ti
  4. 48(22)Ti to the negative 2
 24) Which pair of symbols represents isotopes?
  1. 160, 16N
  2. 160, 170
  3. H, HE
  4. He, He+
 25) The STM, scanning tunneling microscope, shows:
  1. the outer boundary surface of the electrons in an atom
  2. number of excited electrons in an atom
  3. the charge of the nucleus
  4. the mass of the nucleus
 26) Hydrogen combines with nitrogen in a 3:14 weight ratio to form ammonia. If every molecule of ammonia contains three atoms of hydrogen and one atom of nitrogen, an atom of nitrogen must weigh:
  1. 14 times the mass of a hydrogen atom
  2. 14/3 times the mass of a hydrogen atom
  3. 3 times the mass of a hydrogen atom
  4. 3/14 times the mass of a hydrogen atom
 27) Hydrogen combines with florine ina 1:19 weight ration to form hydrogen fluoride. If every molecule of hydrogen flouride contains one atom of hydrogen and one atom of fluorine, an atom of fluorine must weigh:
  1. 38 times the mass o a hydrogen atom
  2. 1/38 times the mass of a hydrogen atom
  3. 19 times the mass of a hydrogen atom
  4. 1/19 times the mass of a hydrogen atom
 28) What was the significance of the early experiment that demonstrated that a brightly glowing ray passed through a tube that contained nothing-a vacuum?
  1. This experiment shoed that glass acts as a good conductor of electricity
  2. This experiment showed that the ray itself was composed of particles
  3. This experiment showed that the gases in the glass tube were required for the glowing ray
  4. This experiment shoed that a vacuum actually does contain gaseous particles
 29) How many carbon atoms are in CH3-O-Ch2-C2H5?
  1. 1
  2. 10
  3. 3
  4. 4
 30) Elements belonging to which group of the periodic table form ions with a 2+ charge?
  1. alkaline earth metals
  2. halogens
  3. chalcogens
  4. alkali metals
 31) What experiment established that the vast majority of the mass of an atom is contained in the nucleus?
  1. Rutherford's experiment where gold foil is bombarded by electrons that are deflected by the gold nuclei
  2. Rutherford's experiment where a gold foil is bombarded by positively charged helium
  3. Rutherford's experiment where gold foil is bombarded by positively charged helium nucli that are deflected by the negatively charged nucleu of the gold
  4. Rutherford's experiment where gold foil is bombarded by positively charged helium nuclei that are deflected by the gold electrons
 32) A chemist on another planet performed the Millikan oil-drop experiment and measured the following charges in his planet's unit for charge, the bot: 2.62 times 10 to the negative 13 bots; 3.93 times 10 to the negative 13 bots. What is the electron's charge in bots?
  1. 31 times 10 to the negative 13 bots
  2. 6.55 times 10 to the negative 14 bots
  3. 3.93 times 10 to the negative 13 bots
  4. 2.62 times 10 to the negative 13 bots
 33) WHich of the following is NOT a postulate of Dalton's atomic theory?
  1. atoms of a single element can have different masses
  2. atoms combine in simple whole number ratios to form compounds
  3. different elements have atoms of different masses
  4. chemical change is a rearrangement of atoms
 34) Which of the following is named correctly?
  1. BaCl26H20; barium chloride pentahydrate
  2. NaclO sodium chlorite
  3. NaC2H3O2; sodium acetate
  4. KNO2; potassium nitrate
 35) WHich one of the following elements does not exist as a diatomic molecule?
  1. H
  2. N
  3. S
  4. F
 36) Which name is incorret?
  1. CC14 carbon tetrachloride
  2. N204 dinitrogen tetroxide
  3. Al2O3 dialuminum trioxide
  4. SCl2, sulfur dichloride
 37) Which of these acids has a name that begins with hydro-?
  1. HCI
  2. HCIO
  3. HCIO2
  4. HCIO3
 38) Which of the following statements is true about the following list of compounds? CO2;KCl;KNO3;N2O
  1. KCl is the only ionic compound
  2. KNO3 is the only ionic compound
  3. CO2 is the only molecular compound
  4. CO2 and N2O are the only molecular compounds
 39) Typically, the mass of an atom of an element in grams is closests to:
  1. 10 to the 23
  2. 1
  3. 10 to the negative 32
  4. 10 to the negative 22
 40) What is the name for CuS?
  1. Copper(II) sulfide
  2. Copper(I) sulfide
  3. Copper(II) sulfur
  4. Copper(I) sulfur
 41) An (56)Fe 2+ particle contains:
  1. 26 protons, 30 neutrons, and 24 electrons
  2. 54 protons, 56 neutrons, and 52 electrons
  3. 58 protons, 58 neutrons, 56 electrons
  4. 28 Protons, 28 neutrons, 26 electrons
 42) How many nitrogen atoms are in CH2(NH2)2:
  1. 1
  2. 4
  3. 2
  4. 3
 43) Naturally occurring neon consists of two isotopes: 20Ne and 22Ne. How many neutrons are in each isotope?
  1. 20, 22
  2. 10,10
  3. 11, 13
  4. 10, 12
 44) How many hydrogen atoms are in Co(NH3)6HPO4?
  1. 19
  2. 6
  3. 3
  4. 18

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