Answer:
Get 3 glass vessels that are sealed except for the opening. If they are test tubes, get 2 rubber stoppers to fit two of the three. If they are clean, dry jelly jars with screw-on lids, then have two lids available for two of the three and use some stretchable plastic wrap to put over the mouth of the jars before affixing the caps (later). Get a piece of painted sheetmetal (iron) , or similar iron like nails that are not coated with zinc galvanization, nor plated with brass or nickel. Whatever they are, make sure they fit within the glass containers you choose, and are all the same size., and from the same sheet or batch of nails. Using some rough, 80-grit sandpaper, abrade the surface until the steel is bared of any paint or coating. throw one piece into the open trst tube ( or jar). In the second container put moisture-absorbing desiccant, place the stretchable wrap over the jar’s mouth then screw on the cap, or put metal, desiccant, then plug into the test tube. This will be the test for moisture significance. In the third test tube, place the metal in, insert a flaming wood splint or kitchen match until the fire goes out then withdraw the splint (match) and tightly plug it shut. If using the jar, place a small birthday-cake candle in it by lighting the candle, dripping the wax, and sticking the base of the candle to the hot wax at the inside jar’s bottom, until it sets upright. Then light it, place the metal in the jar in a place where the soot won’t contaminate the metal (off to one side) then with the candle burning, place a stretchable seal over the top and screw the lid on. The candle will consume a lot of the oxygen so this will be the test for lack of oxygen. The open container is the ‘control’ It is exposed to the daily oxygen and moisture content naturally occurring in your area. Keep the jars separated by a foot or so from each other so no one can say that it was magnetic effects or electric charge that was responsible for the rusting. Start your observation by logging each day, the progress of rusting. Try and quantify it by color, and percentage of area covered by rust, then perhaps apparent depth of rust penetration. You might be able to get desiccant at a pharmacy, or in a hardware store where people use it to remove excess humidity from closets
Explanation:
Step 1 : Convert mass of Iron to moles using n = m/MM.
n(Fe) = 37.5 ÷ 55.845 = 0.671501... mol
Step 2 : Using stoichiometric ratios, find how many moles of Fe2O3 are produced.
Fe : Fe2O3 is 4:2, or simply 2:1. For every 2 moles of Fe there is Fe2O3.
Therefore, moles of Fe2O3 is half the amount of Fe!
n(Fe2O3) = 0.5 x 0.671501... = 0.33575... mol
Step 3: Convert the moles of Fe2CO3 to mass using m = n x MM.
m(Fe2O3) = 0.33575... x [2(55.845)+3(15.999)] = 53.61502... grams
Final step: round your answer to the lowest signficant figures. Since you gave me the mass of iron to 3s.f, m(Fe2O3) = <u><em>53.6 grams</em></u> (3s.f) !
Let me know if you're confused in any way!
From my understanding the correct answer would be phyical
Answer:
C. I, III , IV
Explanation:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.