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:
____________ makes up the majority of oil use, with gasoline and diesel fuel being the most common fuels for this genre. __________ makes up the majority of natural gas usage. Electricity makes up the majority of coal burning.
Fill in the Blank!
Most abundant metal on the surface of the earth:(a) Iron(b) Aluminium(c) Calcium(d) Sodium
Platinum is an expensive and rare metal used in catalytic converters. Much research has been devoted to maximizing reactive properties of other less expensive metals by reducing their size to the nanoscale. Smaller particles are more reactive because they have a larger surface area to volume ratio. Which type of atom in a nanoparticle is more reactive?
An atom on the surface of a particle
An atom in the interior of a particle
The location of an atom in the nanoparticle does not influence its reactivity.
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