#M prompt chemistry free#

“We’re still concerned about the ecological impact of whatever did make it into the river and need a better understanding of what impacts that may have to the watershed,” said Gearhart. While so far no samples from Ann Arbor have contained hexavalent chromium, Gearhart said it could take several weeks to a month for the contamination to reach the city. Still, some may have settled in the river’s sediment and could later spread, said Jeff Gearhart, research director of the Ecology Center. Testing indicates that chromium levels in the river are below levels of concern for effects on human health. The day of the spill, Tribar discharged its waste into the local sewer system, where it traveled to the wastewater treatment plant and out to the river. An interactive map by the non-profit Environmental Working Group found chromium-6 in tap water serving 251 million people throughout the US, at levels scientists deem unsafe. The battle to keep hexavalent chromium out of drinking water is an effort that spans the nation.

#M prompt chemistry free#

State water regulators issued violations and continue to press the company for answers, including why the employee was present at the plant when it wasn’t in production.Ī spokesperson for the FBI did not specify the scope of its inquiry, but told the Detroit Free Press that the agency can become involved in an incident involving a chemical leak when there is potential criminal activity. Tribar said in a statement that the worker responsible for overriding its alarm system resigned from the company the day the spill was reported. The 2000 film Erin Brockovich brought chromium-6 to national attention, featuring the true-life tale of a legal assistant who discovered elevated rates of cancer and death among residents of Hinkley, California, were linked to the contaminant in their drinking water.

Plagioclase 53.44 0.02 (labradoritel 29.58 0.13 0.14 0.To support our nonprofit environmental journalism, please consider disabling your ad-blocker to allow ads on Grist. Rock/minerals major element compositions are typically reported as weight percentages (wt%) of the oxides of the major cations (see below). Mineral and lava chemistries given are directly comparable Table 1: Common chemical compositions for basalt, plagioclase and olivine. Note: All analyses are given using the same units weight percentages for each element in its oxide form. Use the mineral and basalt chemistry provided to predict how crystallization of equal amounts of plagioclase and olivine will affect the chemistry of the basalt liquid provided For each of the major element oxides listed predict whether their concentrations will increase or decrease Justify your answer. In the case of mafic phases it is the Mg-rich composition in the solid solution and in the case of plagioclase it is the Ca-Al rich (Anorthitic) variety.

What's the difference? Prompt 2: The minerals that commonly crystallize from a basaltic magma are some combinations of olivine, plagioclase feldspar and pyroxene. Hint: Compare the minerals formula of olivine and orthopyroxene. figs 8.6 and 8.8) and how crystallization of minerals affects the chemistry of a magma (the liquid). Transcribed image text: Prompt 1: Why would crystallization of olivine from a basalt eventually cause olivine to no longer be a stable phase in the liquid and react to form orthopyroxene as predicted by Bowen? Will this always occur? Why/why not? In addressing this question consider the information provided below (including lava and mineral chemistry in table 1) along with what you know about phase diagrams (c.f.