It is perceived that this design concept will open up a fresh insight of simple, rapid and reliable detection of other heavy metal ions in drinking water and environmental samples. The lower limit detection is 0.27 μM. This assay exhibits excellent selectivity for Cu 2+ over other environmental metal ions. Simultaneously, the solution color changes from dark yellow to colorless. When Cu 2+ is introduced into this silver nanoplate system, Cu 2+ can oxidize I − to iodine (I 2), which can further oxidize silver to form silver iodide (AgI). Further, silver nanoplates coupled with iodide ions are employed for the colorimetric determination of copper ions (Cu 2+) based on a new strategy of fusion/oxidation etching nanoplates. This system shows excellent selectivity in the presence of a variety of other metal ions. Cr 3+ can cause aggregation through high affinity between Cr 3+ and carboxylate groups of citrates, resulting in a color change from dark yellow to purple and at last colorless. Citrate-capped silver nanoplates are applied for the detection of chromium ions (Cr 3+) based on aggregation of silver nanoplates. True or False Answer: True The formula for potassium sulfide is _.The authors have studied the role of different ligands on the surfaces of silver nanoplates for regulating their analytical applications. True or False Answer: False 1) The least electronegative halogen is astatine. Īnswer: True 2) The possible oxidation numbers for iron are +1 and +2. True or False Answer: False 3) The formula for chromium (II) iodide is. (d).in the same group of the periodic table (d).in the same group of the periodic table 3) An atom of 131 I contains _ electrons.Į) 53 E) 53 2) An atom of 15 N contains _ neutrons.Į) 15 C) 8 1) An atom of 17 O contains _ protons.Į) 17 A) 8 5) The correct name for is sodium azide. (c).in the same period of the periodic table (d).definitely a non-meta (b).definitely a metal Elements _ exhibit similar physical and chemical properties. (d).hydrogen (c).sulfur An element that appears in the lower left corner of a periodic table is _. Which one of the following does not occur as diatomic molecules in elemental form? (d).the isotope of each element in a compound (a).how many of each atom are in a molecule. (c).which atoms are attached to which in a molecule (b).the simplest whole-number ratio of different atoms in a compound (a).how many of each atom are in a molecule (d).the geometry of a molecule (c).the simplest whole-number ratio of different atoms in a compound A molecular formula always indicates _. (c).the simplest whole-number ratio of different atoms in a compound (b).how many of each atom are in a molecule (a).which atoms are attached to which in a molecule (d).sulfur, fluorine (b).barium, bromine The molecular formula of a compound is always _ the empirical (d).protons, neutrons, and electron (a).electrons Which pair of elements is most apt to form an ionic compound with each other? ![]() Different isotopes of a particular element contain the same number of _. (d).electrons, protons (c).protons, neutrons. (d).Ca3(PO4)2 (d).Ca3(PO4)2 Isotopes are atoms of the same element that have the same number of _ The correct formula for molybdenum(IV) hypochlorite is _.ģ- form a salt with the formula _. (d) sodium (III) nitride (a).sodium nitride. (d).bromous acid (d).bromous acid The correct name of the compound Na3N is _. chloric acid The correct name for HBrO2 is _. (d).sulfurous acid (d).sulfurous acid The correct name for HC1O3 is _. (d).carbonic acid (d).carbonic acid The correct name for H2SO3 is _. (d).Mg3O2 (b).MgO The correct name for H2CO3 is _. (d).None of the above (d).None of the above Predict the empirical formula of the ionic compound that forms from magnesium and (d).None of the above (d).None of the above Predict the empirical formula of the ionic compound that forms from sodium and The charge on the manganese in the salt MnF3 is _.
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