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Mar 20th, 2015
Steve1995
Category:
Chemistry
Price: $15 USD

Question description

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)



   

 

   

 

   

 

   

 

  




2 points  

QUESTION 45

  In an electrolysis reaction, oxidation occurs at which electrode?



   

 

    Cathode


   

 

  Anode


   

 

  Both electrodes


   

 

  Neither electrode


  




2 points  

QUESTION 46

  Which of the following is a free radical?



   

 

  Ozone, O3

   

 

  Fluorine, F2

   

 

  Chlorine, Cl2

   

 

  Nitrogen dioxide, NO2

  




2 points  

QUESTION 47

  How much heat is required to heat 25 g of liquid water from 20 °C to 100 °C



   

 

    25 cal


   

 

    1000 cal


   

 

    2000 cal


   

 

    1  00 cal


  




2 points  

QUESTION 48

  The phrase "acid rain" applies to rain water with a pH of



   

 

    7


   

 

    6-7


   

 

    < 5.6


 

 

   

 

    5.6


  




2 points  

QUESTION 49

  Identify the exothermic process among the following.



   

 

  Wood burning


   

 

  Boiling water


   

 

  Melting ice


   

 

  100 cal of energy are absorbed


  




2 points  

QUESTION 50

  Fertilizers such as nitrates and phosphates are examples of what type of pollutant?



   

 

  Minerals and chemicals


   

 

  Infectious agents


   

 

  Plant nutrients


   

 

  Oxygen-demanding wastes



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