Circle the answer

| September 12, 2019
Circle the answer
  What is the density of a substance with a mass of 45.00 g and a volume of 26.4 mL?


      1.70 g/mL
      0.59 g/mL
      0.587 g/mL
      45.0 g/mL
  



2 points  
QUESTION 9
  Which of the following matters is a compound?


      Copper
      Water
    Saline solution
      Air
  



2 points  
QUESTION 10
  A dose of aspirin of 5.0 milligram per kilogram has been prescribed to reduce the fever of an infant weighing 8.5 pounds.  The number of milligram of aspirin that should be administered is


        53 mg
        19 mg
        1.6 mg
        5.0 mg
  



2 points  
QUESTION 11
  The number of valence shell electrons in all noble gases (except helium) is


        6
        7
        8
        9
  



2 points  
QUESTION 12
  The number of electrons in a neutral atom with 30 protons and 34 neutrons is


        30
        64
        34
        94
  



2 points  
QUESTION 13
  How many electrons is in the valence shell of a calcium atom?


        20
        8
        2
        1
  



2 points  
QUESTION 14
  How many protons, neutrons, and electrons are in the following isotope, respectively?


    3, 3, 3
    3, 6, 3
    6, 3, 6
    6, 3, 3
  



2 points  
QUESTION 15
  What is the ground state of a hydrogen atom?


      Three electrons in the n=1 level
      One electron in the n=2 level
      One electron in the n=1 level
      One electron in the n=1 level and one electron in the n=2 level
  



2 points  
QUESTION 16
  Which substance would be present in the greatest concentration during the morning rush hour on a smoggy day in Los Angeles?


        NO
        O3
        NO2
        SO3
  



2 points  
QUESTION 17
  When coal and fuel oil are burned, what two primary pollutants are formed?


      SO2 and CO2
      HNO3 and H2SO4
      CO and O3
      Hydrocarbons and NO2
  



2 points  
QUESTION 18
  Why are small particulates in the atmosphere dangerous to human beings?


      They can enter into and lodge in very small crevices of the lungs and cause concentrated abrasive injury.
      They grind the enamel off of teeth.
      They absorb and concentrate other pollutants.
      They dissolve in rivers and lakes and fill them up.
  



2 points  
QUESTION 19
  Convert 0.000053% to ppb


      53 ppb
      530 ppb
      5300 ppb
      5.3 ppb
  



2 points  
QUESTION 20
  Magnesium nitride is made up of magnesium ions and nitride ions. What is the expected formula of magnesium nitride?


      MgN
      Mg2N3
      MgN2
      Mg3N2
  



2 points  
QUESTION 21
  How many nonbonding electrons are in the water molecule?


        0
        2
        4
        6
  



2 points  
QUESTION 22
  How many nonbonding electrons are in the water molecule?


        0
        2
        4
        6
  



2 points  
QUESTION 23
  Which of the following substances has polar covalent bonds?


      CaF2
      KBr
      NH3
       CH4
  



2 points  
QUESTION 24
  What is the charge on an ion with 7 protons, 7 neutrons, and 10 electrons?


        0
        +3
        -3
        -7
  



2 points  
QUESTION 25
  How are carbon dioxide concentrations determined from thousands of years ago?


      Analysis of decayed plant material
      Analysis of ice samples
      Analysis of the atmosphere
      Analysis of the Earth’s core
  



2 points  
QUESTION 26
  The highest recorded temperature on earth was 136°F in El Azizia, Libya. What is this temperature in Celsius?


    104 °C
    277 °C
    58 °C
    76 °C
  



2 points  
QUESTION 27
  How much energy is in a gamma ray with a frequency of 2.5 x 1020 s-1 (E = hv where h = 1.58 x 10-34 cal • s)


    4.0 x 1020 cal
    4.0 x 1054 cal
    4.0 x 10-20 cal
    4.0 x 10-14 cal
  



2 points  
QUESTION 28
  What is the problem with increasing amounts of carbon dioxide in the atmosphere?


      Its lack of consumption in respiration
      A rise in pH of ocean water
      Too much UV radiation being absorbed
      Global warming
  



2 points  
QUESTION 29
  What chemical bond is broken by a photon of light in a typical CFC molecule?


        C-H
        Cl-Cl
        H-Cl
        C-Cl
  



2 points  
QUESTION 30
  Which type of chemical bond requires the least amount of energy to break?


      Single
        Double
      Triple
      Quadruple
  



2 points  
QUESTION 31
  Approximately how many ozone molecules can one chlorine atom derived from one CFC molecule react with?


      1 molecule O3
      100 molecules O3
      1000 molecules O3
      100000 molecules O3
  



2 points  
QUESTION 32
  Which of the following explains why CFCs are not removed from the atmosphere by rainout?


      CFCs are not water solublen water.
      CFCs are chemically inactive in the troposphere
      UV radiation removes them more quickly.
        This is due to both their chemical stability and solubility in water.
  



2 points  
QUESTION 33
  Which will have the largest molar mass?


      1 mole of Ar, argon
      1 mole of CO, carbon monoxide
      1 mole of N2, nitrogen
      1 mole of Sn, tin
  



2 points  
QUESTION 34
  What numbers are needed to balance the following equation, respectively?  ____CO2 + ____H2O —> ____C6H12O6 + ____O2


    1, 1, 1, 1
    6, 6, 6, 6
    6, 6, 1, 6
    6, 1, 1, 6
  



2 points  
QUESTION 35
  How many atoms are represented in the formula Ca3(PO4)2?


        9
        11
        13
        1
  



2 points  
QUESTION 36
  What is the number of atoms in 1.0 mol of nitrogen dioxide, NO2?


    1.8 x 1024 atoms
    1.8 x 1023 atoms
    2.0 x 1023 atoms
      3 atoms
  



2 points  
QUESTION 37
  The balanced equation for the decomposition of hydrogen peroxide, H2O2, is given below. What number of grams of O2 result from 3 . g of hydrogen peroxide?


    300. g O2
    3 . g O2
    320. g O2
    338. g O2
  



2 points  
QUESTION 38
  The strength of an acid is related to its


      Extent of ionization
      Reaction with a salt
      Concentration
      Commercial ranking in the economy
  



2 points  
QUESTION 39
  What volume (in liters) of 1 M NaOH contains g sodium hydroxide?


      100 L
      1 L
      10 L
      1000 L
  



2 points  
QUESTION 40
  What is the pH of a 0.0001 M HCl solution?


      10-4
      0.0001
      -4
        4
  



2 points  
QUESTION 41
  What is the salt formed when an HCl solution reacts with Mg(OH)2?


      MgCl2
      Mg2Cl
      MgCl
      Mg2Cl2
  



2 points  
QUESTION 42
  How many moles of sulfuric acid, H2SO4(aq) are in 2.0 liters of 18 M H2SO4?


        9.0 mol
        20. mol
        36 mol
        98 mol
  



2 points  
QUESTION 43
  In the equation 2 Na(s) + Cl2(g) —> 2 Na+ + 2 Cl, the oxidizing agent is


        Na (s)
        Cl2 (g)
        Na+
        Cl
  



2 points  
QUESTION 44
  Identify the reduced species in the following equation CH4(g) + 2O2(g) —> CO2(g) + 2H2O(g)


                  



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