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Interpret and explain the information on the herbicide label including the use of pictograms and supplemtary information provided by the manufacture or dealer as it relates to handling, storage and transportation of chemicals.
For estimating ozon in the air, a certain volume of air is passed through an acidified or neutral KI solution when oxygen is evovled and iodide is oxidized to give iodine
Name the chemical family of elements that is absent from Mendeleev's table. 2) Which 4 elements were missing from mendeleev's periodic table? atomic masses: 45, 68, 70, 180
(a) In the acetylene molecule (C2H2), which of the following are present? A) 2 VSEPR electron pairs around each carbon atom B) 3 ? and 1 ? bonds C) 2 ? bonds
A pstient is administered mercury-197 to help evaluate kidney fuction. Mercury-197 has a half - life of 65 hours. what fraction of an initial of an initial does of mercury-197 remains after 6-0 days?
Choose the answer which presents the chemical formulas for two substances in order of decreasing melting point (highest melting point first) and gives a valid reason for this order.
A portable photometer with a linear response to radiation registered 73.6 μA with a blank solution in the light path. Replacement of the blank with an absorbing solution yielded a response of 24.9 μA. Calculate
Hydrogen sulfide is found at a concentration of 3 parts per million in air. Using the temperature and pressure conditions that are considered "standard" for air quality work, this concentration means that there are [Blank] milligrams of hydrogen s..
Detailed calculations show that the value of Z eff for the outermost electrons in Na and K atoms is 2.51+ and 3.49+ , respectively. What value do you estimate for Zeff experienced by the outermost electron in both Na and K by assuming core electro..
Calculate the wavelength of a photon emitted when 1x10^-27 g particle in a box of a length 6.0 Angstrom goes from n=5
In terms of uncertainty, why is an endpoint volume of 9 mL less preferred than an endpoint volume of 35 mL? In terms of uncertainty, why is an endpoint volume of 55 mL less preferred than a volume of 35 mL?
How long will it take for all of the strontium 90 presently on the earth to be reduced to 1/32nd of its present amount?
what is the energy of the light emitted in joules when an electron falls from the n=4 to the n=2 orbit in the hydrogen atom ? (E2= -328 kJ/mol , E1= -82 kJ/mol)
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