Chemistry, 30.10.2020 04:30 shiiIjustneedananswe
An atom of Element X contains 20 protons and 27 neutrons. Identify the element, and write the symbol for the isotope in the standard form.
Answers: 1
Chemistry, 22.06.2019 16:50, TrueKing184
Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.
Answers: 1
Chemistry, 22.06.2019 19:00, ecolifesfsu1263
What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-
Answers: 1
Chemistry, 22.06.2019 21:40, k3rbycalilung
Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.
Answers: 2
Chemistry, 22.06.2019 22:30, jaylenmiller437
The diagram shows the relationship between scientific disciplines. the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a. physics b. biology c. chemistry d. metallurgy
Answers: 2
An atom of Element X contains 20 protons and 27 neutrons. Identify the element, and write the symbol...
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