List a couple environmental / human health and safety issues with the gold metal.

Zinc metal + aqueous lead(II) nitrate State your observation and include atleast one of the statments below. • A metallic deposit appears • Bubbles appear • A temperature change occurs • A color change occurs • A precipitate (cloudy, tiny particles) appears  video: https://www.youtube.com/watch?v=wlB8O5zbJug&t=2s

Why is titanium metal called as strategic metal? Mention two of its properties which makes it so special

Chromite ore analyzed 30.4% Cr2O3. Determine the theoretical amount of lead chromate (PbCrO4) that can be obtained from 1000 lg of the ore.

To measure the nickel content in steel, the alloy is dissolved in 12 M HCl and neutralized in the presence of citrate ion, which maintains iron in solution. The slightly basic solution is warmed, and dimethylglyoxime (DMG) is added to precipitate the red DMG-nickel complex quantitatively. The product is filtered, washed with cold water, and dried at 110°C. a) If 1.1634 g of steel gives 0.1795 g of precipitate, what percentage of Ni is in the steel?

List 5 of the most important metals in (i) batteries including electric vehicles and (ii) electronics (including cell phones laptop computers, etc.). Address the following issues for each metal in both categories. I suggest a tabulated format as it might be helpful: A. Major countries where these metals are produced and brief description of extraction processes B. Prices and trends (in the past five years) c. Most important companies in the world in mining, and list if any of them has activities in KSA or the Arab world

1) List an oxidizing agent that will: a) oxidize Cu to Cu*2, without oxidizing Cu to Cu*1. b) oxidize Mn to Mn*2, without oxidizing Mg to Mg*2. c) oxidize Br1 to Br2, without oxidizing H20 to O2 with H*1 d) oxidize Cr(OH)3 with OH1 to CrO42, without oxidizing NO21 with OH1 to NO31. e) oxidize La to La*3, without oxidizing Al to Al*3.

An ore containing magnetite, Fe3O4, was analyzed by dissolving a 1.5419-g sample in concentrated HCl, giving a mixture of Fe2+ and Fe³+. After adding HNO3 to oxidize any Fe²+ to Fe³+, the resulting solution was diluted with water and the Fe³+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, giving 0.8525 g of pure Fe₂O3. Calculate the %w/w Fe3O4 in the sample.

. A solution of Cr(NO3)3 is used to electrochemically deposit Cr(s) using a 2.25 amp power supply. If this deposition runs for 9 hours, 24 minutes, and 15 seconds what mass, in grams, of chromium will be deposited from this solution? The atomic mass of Cr is 52.00 g/mole.