Exam I Review

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Exam I Review

• Chemistry 1211
• Dr. Clower

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• 1. All of the following are true except
• An element cannot be broken down into two or more
  pure substances
• A compound is a substance that contains two or
  more elements
• A pure compound always contains the same elements
  in the same mass percentages
• Another name of a heterogeneous mixture is a
  solution

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• 2. All of the following statements are true
  except
• Potassium is represented by the symbol K
• Zinc is represented by the symbol Zn
• Argon is represented by the symbol Ar
• Iron is represented by the symbol Fe
• Nitrogen is represented by the symbol Ni

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• 3. All of the following relationships are false
  except
• 1.5 cm3 1.5 mL
• 3.00 m3 lt 3.00 L
• 5.2 m3 5.2 x 102 cm3
• 0.0455 L gt 455 mL
• 22 L 22 m3

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• 4. If the outdoor temperature is 17.0ºC, what is
  the temperature in Fahrenheit?
• -1.40ºF
• 30.6ºF
• 41.4ºF
• 62.6ºF
• 74.6ºF

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• 5. How many significant figures are in the
  following mass 0.00047800 kg?
• 3
• 5
• 6
• 8
• 9

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• 6. What is the correct answer to the expression
  below?
• 8 cm
• 7.8 cm
• 7.83 cm
• 7.826 cm
• 7.8257 cm

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• 7. How many miles are covered in a 15 km race?
• 7.1 mile
• 9.3 mile
• 11 mile
• 15 mile
• 26 mile

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• 8. Which of the following describes a chemical
  change?
• Oxygen reacts with aluminum, forming a protective
  coating
• The density of mercury metal is 13.534 g/cm3
• Ethyl alcohol evaporates from a beaker
• The melting point of sodium chloride is 801ºC
• Both answers A and D are correct

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• 9. A solid with a mass of 19.3 g is added to a
  graduated cylinder filled with water to the 25.0
  mL mark. After the solid sinks to the bottom, the
  water level is at 35.8 mL. What is the density of
  the solid?
• 0.539 g/mL
• 0.560 g/mL
• 1.79 g/mL
• 2.19 g/mL
• 8.50 g/mL

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• 10. All of the following statements are true
  except
• A proton carries a 1 charge and an electron
  carries a -1 charge
• The nucleus of an atom has a negative charge
• A neutron is an uncharged particle with a mass
  slightly greater than a proton
• More than 99.9 of an atoms mass is concentrated
  in the nucleus

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• 11. All atoms of the same element have the same
  number of __________.
• Neutrons
• Protons
• Protons and neutrons
• Electrons and neutrons
• Protons, neutrons, and electrons

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• 12. A radioactive isotope of fluorine, 20F, has
• 9 protons, 10 neutrons, and 1 electron
• 9 protons, 10 neutrons, and 9 electron
• 9 protons, 11 neutrons, and 9 electron
• 10 protons, 9 neutrons, and 1 electron
• 10 protons, 10 neutrons, and 10 electron

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• 13. What is the identity of the following
  element?
• Zinc
• Silver
• Iridium
• Cesium
• Manganese

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• 14. How many metals are there in group 13?
• 0
• 1
• 2
• 3
• 4

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• 15. Which group of three elements contains an
  alkaline earth metal, a halogen, and an inner
  transition metal?
• Be, S, U
• Ba, As, Ce
• U, Cl, Rb
• Mg, Br, Pu
• K, Ga, Se

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• 16. A strontium ion has _______ electrons.
• 36
• 37
• 38
• 39
• 40

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• 17. What is the charge on a sulfide ion?
• -2
• -1
• 0
• 1
• 2

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• 18. Identify the ions and their charges in
  Na2SO4.
• Na, SO4-
• Na, SO42-
• Na, SO4-
• Na2, SO4-
• Na2, SO42-

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• 19. What is the correct name for K3PO4?
• Tripotassium phosphate
• Potassium (I) monophosphorus tetraoxide
• Potassium (I) phosphate
• Potassium phosphate
• Potassium pohsphide

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• 20. What is the correct name for N2O3?
• Nitrogen oxide
• Nitrogen (II) oxide
• Nitrogen (III) oxide
• Trioxygen dinitride
• Dinitrogen trioxide

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• 21. What is the formula for chlorous acid?
• HCl
• HClO
• HClO2
• HClO3
• HClO4

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• 22. An atomic mass unit (amu) is defined as
• 1.602 10-19 C
• The mass of 1 mole of hydrogen-1 atoms
• The mass of 1 hydrogen-1 atom
• The mass of 1 carbon-12 atom
• 1/12 the mass of 1 carbon-12 atom.

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• 23. An element has three naturally occurring
  isotopes with the following abundances and
  masses. Determine the atomic mass of the element.
• Abundance mass(amu)
• 78.99 23.985042
• 10.00 24.985837
• 11.01 25.982593
• 24.31 amu
• 24.98 amu
• 74.95 amu
• 2431 amu
• None of the above

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• 24. Which one of the following is the most
  effective method of determining isotopic ratios
  of elements?
• Distillation
• Filtration
• Chromatography
• Absorption spectroscopy
• Mass spectrometry

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• 25. Which of the following samples contains the
  largest number of atoms?
• 2.0 moles of H3PO4
• 3.0 moles of H2SO3
• 4.0 moles of HNO3
• 6.0 moles of HClO
• 8.0 moles of HBr

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• 26. What mass of oxygen is present in 10.0 grams
  of carbon dioxide?
• 0.227 g
• 4.64 g
• 4.40 g
• 7.27 g
• 8.80 g

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• 27. Which is a correct method for determining the
  mass in grams of 0.190 mol silver?
• None of the above

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• 28. Which is a correct method for determining the
  total number of atoms in 123 grams of sulfur
  trioxide?

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• 29. What is the percent composition of silicon
  nitride (Si3N4)?
• 30.21 Si and 69.79 N
• 42.92 Si and 57.08 N
• 54.03 Si and 45.97 N
• 60.06 Si and 39.94 N
• 69.40 Si and 30.60 N

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• 30. A mass of 8.15 g C2H4(g) reacts with excess
  oxygen. If 16.2 g CO2(g) is collected, what is
  the percent yield of the reaction?
• C2H4(g) 3O2(g) ? 2CO2(g) 2H2O(g)
• 25.6
• 31.7
• 41.0
• 57.1
• 63.3

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• 31. An oxide of nitrogen contains 63.1 oxygen
  and has a molar mass of 76.0 g/mol. What is the
  molecular formula for this compound?
• N2O
• NO
• NO2
• N2O3
• N2O5

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• 32. Hydrazine, a fuel used to power rocket
  engines, is a product of the reaction between
  ammonia and bleach. Balance the equation for the
  reaction.
• aNH3(aq) bOCl-(aq) ? cN2H4(l) dCl-(aq)
  eH2O(l)
• a 2, b 1, c 1, d 1, e 1
• a 2, b 2, c 1, d 2, e 2
• a 2, b 1, c 2, d 1, e 2
• a 4, b 3, c 1, d 3, e 1
• a 4, b 3, c 2, d 3, e 2

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• 33. Aluminum reacts with oxygen to form aluminum
  oxide. Which of the reactions below is correct
  and properly balanced?
• Al(s) O(g) ? AlO(s)
• 2Al(s) O2(g) ? 2AlO(s)
• 3Al(s) O2(g) ? Al3O2(s)
• 4Al(s) O2(g) ? 2Al2O(s)
• 4Al(s) 3O2(g) ? 2Al2O3(s)

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• 34. Which method is correct for determining the
  mass of carbon dioxide that can be made by the
  combustion of 3.219 grams of ethanol with excess
  oxygen?
• C2H5OH(l) 3O2(g) ? 2CO2(g) 3H2O(l)