DDT Affects Neurons The pesticide DDT (C14 H9 Cl5) kills insects such as malaria-carrying mosqui

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DDT Affects Neurons The pesticide DDT (C14 H9 Cl5) kills...

DDT Affects Neurons The pesticide DDT $\left(\mathrm{C}_{14} \mathrm{H}_{9} \mathrm{Cl}_{5}\right)$ kills insects such as malaria-carrying mosquitoes by opening sodium ion channels in neurons, causing them to fire spontaneously, which leads to spasms and eventual death. However, its toxicity in wildlife and humans led to the banning of its use in the United States in $1972 .$ Analysis of DDT concentrations in groundwater samples between 1969 and 1971 in Pennsylvania yielded the following results: TABLE CANT COPY Express these concentrations in ppm and in millimoles per liter.

DDT Affects Neurons The pesticide DDT $\left(\mathrm{C}_{14} \mathrm{H}_{9} \mathrm{Cl}_{5}\right)$ kills insects such as malaria-carrying mosquitoes by opening sodium ion channels in neurons, causing them to fire spontaneously, which leads to spasms and eventual death. However, its toxicity in wildlife and humans led to the banning of its use in the United States in $1972 .$ Analysis of DDT concentrations in groundwater samples between 1969 and 1971 in Pennsylvania yielded the following results:
TABLE CANT COPY
Express these concentrations in ppm and in millimoles per liter.

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Key Concepts

Molarity

Molarity is a measure of concentration expressed as the number of moles of solute per liter of solution. Converting a concentration to molarity requires dividing the mass concentration by the molecular weight of the solute, which allows chemists to work with the actual number of molecules present in a solution.

Unit Conversion

This concept involves using proportional relationships to change a quantity expressed in one set of units into an equivalent quantity in another set of units. In the context of chemical concentrations, this may involve converting between mass-based measurements and molar amounts by using conversion factors, such as the density of the medium or the molecular weight of the solute.

Parts per Million (ppm)

PPM is a unit of concentration often used for dilute solutions and environmental measurements. It denotes one part of solute per million parts of the solution. In aqueous solutions, it is generally equivalent to milligrams per liter (mg/L), assuming the density of water is approximately 1 g/mL.

Molecular Weight

The molecular weight of a compound is the mass of one mole of its molecules, expressed in grams per mole. It is a crucial factor in converting between mass and moles, enabling the calculation of molar concentrations from mass-based measures and vice versa.

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