The U.S. Environmental Protection Agency (U.S. EPA) monitors air quality in the United States. Lead is among the pollutants regularly monitored and regulated. Lead is released into the atmosphere primarily by the processing of metals ores containing lead and by lead-based battery manufacturing. The effects of too much exposure to lead include neurological damage and cardiovascular disease. Because of the Clean Air Act and its amendments, the amounts of lead in air have been decreasing for many years. The chart below shows the lead concentration in air in the United States from 2000 to 2014. Examine the data and answer the questions below. Lead Concentration in Air in U.S. Year Determine the lead concentrations in 2000 and in 2014. Calculate the percent change in lead concentration that occurred from 2000 to 2014. Hint. Calculate the percent change with the following equation: (final concentration — initial concentration) percent change = . . : x 100 % initial concentration How many lead atoms were in one cubic centimeter of air in 2011? Examine the mass spectrum for lead shown below. How many Pb-206 atoms were in one cubic centimeter of air in 2011?
The U.S. Environmental Protection Agency (U.S. EPA) monitors air quality in the United States. Lead is among the pollutants regularly monitored and regulated. Lead is released into the atmosphere primarily by the processing of metals ores containing lead and by lead-based battery manufacturing. The effects of too much exposure to lead include neurological damage and cardiovascular disease. Because of the Clean Air Act and its amendments, the amounts of lead in air have been decreasing for many years. The chart below shows the lead concentration in air in the United States from 2000 to 2014. Examine the data and answer the questions below. Lead Concentration in Air in U.S. Year Determine the lead concentrations in 2000 and in 2014. Calculate the percent change in lead concentration that occurred from 2000 to 2014. Hint. Calculate the percent change with the following equation: (final concentration — initial concentration) percent change = . . : x 100 % initial concentration How many lead atoms were in one cubic centimeter of air in 2011? Examine the mass spectrum for lead shown below. How many Pb-206 atoms were in one cubic centimeter of air in 2011?
Solution Summary: The author explains that the concentration of lead in various years should be identified. Number of moles is the mass of an element given divided by its atomic number.
The U.S. Environmental Protection Agency (U.S. EPA) monitors air quality in the United States. Lead is among the pollutants regularly monitored and regulated. Lead is released into the atmosphere primarily by the processing of metals ores containing lead and by lead-based battery manufacturing. The effects of too much exposure to lead include neurological damage and cardiovascular disease. Because of the Clean Air Act and its amendments, the amounts of lead in air have been decreasing for many years. The chart below shows the lead concentration in air in the United States from 2000 to 2014. Examine the data and answer the questions below. Lead Concentration in Air in U.S.
Year
Determine the lead concentrations in 2000 and in 2014.
Calculate the percent change in lead concentration that occurred from 2000 to 2014. Hint. Calculate the percent change with the following equation:
2. NITROGEN MOLECULES
It is difficult to think that some good things come from the powerful bust of
electrical energy. During thunderstorms, the nitrogen and oxygen from the air react to
form oxides of nitrogen. These oxides dissolve in the rain and are absorbed by the soil,
fertilized with nitrogen. According to studies, more than 50% of usable nitrogen is
generated from the atmosphere in this process.
Explain the process that happens to nitrogen and oxygen during a thunderstorm
in terms of chemical bonding. What is the benefit of this bond? (P)
3.
ALLOYS
Metal alloys are created through metallic bonding. Two examples of alloys are
brass (zinc and copper) and steel (carbon and iron). Metallic bonding is utilized for its
conductive properties to help transfer electricity throughout a house via copper wiring.
Metallic bonds also exist between cast iron, which is made up of iron and carbon,
bronze (Cu &Sn), stainless steel (Fe, Cr, C, In), and so on. It is used mostly to improve
the…
The U.S. is one of several countries committed to reaching “net-zero” carbon emissions by 2050. This means that by 2050, all carbon dioxide emissions must be matched by the amount of carbon dioxide removed from the air. Why is it essential for all countries in the world to meet carbon reduction commitments like this
Which of the following calcium compounds is used to determine the presence of carbon dioxide and commonly used in
laboratories?
Calcium tungstate
Calcium hypochlorite
Calcium hydroxide
Calcium carbonate
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