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


QUESTION 1Which is considered a fossil fuel?CoalSolarWindHydrothermal2 points  QUESTION 2Which is considered a physical science?PhysicsBiologyZoologyBotany2 points  QUESTION 3Refrigeration has been used since the late 1800s and early refrigerants wereSafeFlammable and toxicInertFluorine compounds, CFCs2 points  QUESTION 4The smallest concentration listed below isParts per millionParts per trillionParts per billionParts per thousand2 points  QUESTION 5Which activity comes first in the scientific method?ConclusionHypothesisExperimentationObservation2 points  QUESTION 6A patient’s body weight is 158 pounds which is equivalent to82.1 kg34.8 kg348 kg71.7 kg2 points  QUESTION 7The measurement 0.0000043 m, expressed correctly using scientific notation is4.3 x 10-74.3 x 10-64.3 x 1060.43 x 10-5

Hi,I have a lab Report about an experiment called ionic compound & Precipitation. Below are the file you may need;Lab stepDataLab report guid