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When aluminum metal is heated with an element from group VIA of the periodic table, an ionic compound forms. When the experiment is performed with an unknown croup VIA element, the product is 18.56% Al by mass. What is the formula of the compound and what is its name?
Let's say you have l00 grams of this compound, so inside the compound would be l8.56 grams of Aluminum and the remaining. 81.44 grams of the second element. Elements in group 6A have 6 electrons in their outer shell and an oxidation # of -2 and the formula for the compound would be Al2X3. a 2mole Al to 3 mole X ratio. The compound would have the atom ratio of Al2X3 derived from the valences of +3 and -2. So the two aluminum atoms in the compound would be providing a total mass of l8.56 grams and the three atoms of X would be providing the remaining mass of 81.44 g so we have the ratio. l8.56 g Al/ 2 Al moles = 81.44 grams element X/ 3 moles X The mass ratio between these two elements is 8l.44 over l8.56 or 4.38 to l The atomic wt. total for 2 aluminum atoms is 54 so the atomic wtl total for three atoms of element X should be 4.38 times 54 which is 236.9 Now if we divide 236.9 by three atoms of X in the compound we get an atomic wt. of 78.9 which corresponds to Selenium So the compound is Al2Se3. This was a challenging problem, congratulations to your chem teacher.!!!
Tossing away an aluminum can wastes as much energy as pouring out half of that can’s volume of gasoline.what does that mean?
Aluminum cans are made of energy so there is as much energy in the can as in half a can of gasoline.
I am so confused right know. I want to cook something using an aluminium foil. Is the reflective side supposed to be inside or outside?
it doesn't matter - they are exactly the same the shinier side is a result of the rolling during the manufacturing process and makes no difference whatsoever
Yes, aluminum coils can be used in aerospace heat exchangers. Aluminum is widely used in aerospace applications due to its lightweight and excellent heat transfer properties. It offers good corrosion resistance, high thermal conductivity, and is cost-effective, making it a suitable material for heat exchangers used in aircraft and other aerospace systems.
for purchasing aluminium are the grades to be mentioned
If it is a product for work, yes engineers and purchasers specify the grades. If for hobby then it is up to you. Common extruded shapes (beams, tubes, angles) - 6061-T6 - 6063-T5 -T6 specifies tempering class. Actually both alloys come in various T4, T5, etc., the above are just two common combinations. 6061 is a little stronger, and T6 gets its strength up quite good. Beware that welded joints are weaker since heat removes the strength from tempering. Some common sheets - 6061 (strength) - 5052 (strength, welds better than 6xxx, good formability) - 5068 (some call it 'marine grade' for corrosion resistance) Sheets can come in many alloys.... you may get cheaper grades if you don't need one of these. (if you are casting - there's whole other system of grades.) The above are just common grades. For high strength requirement you may need a specific grade in the 7xxx family.
if the resistivity of aluminium is 2.7×10-8 Ωm
Let ρ be the resistivity of the aluminum cable, A the cross sectional area of the cable and l the cable's length. The resistance R of the aluminum cable is now given by: R = ρ·l / A = 2.7·10^-8·(10·10^3) / (π·r?) = 2.7·10^-8·(10·10^3) / (π·(1·10^-3)?) = 85.9 Ω I guess the tricky part is remembering: R = ρ·l / A but when you realize how intuitive this equation is you don't have to memorize it. The resistance R is proportional to the resistivity ρ, so we must have the following in our equation: R = ρ·k , where k is some value governed by the dimensions of the cable! It is logical that the resistance is also proportional to the wires length l. This is logical when you realize that the longer the wire the more obstacles the electrons will have to pass by! Now we have that: R = ρ·l·c , where c is another value governed now by the cross sectional area (only dimensional property left). If we think of the wire as a highway with cars instead of electrons we realize that there is less resistance (higher speed) when the highway has many lanes and is very broad. From this we realize that the greater the cross sectional area the smaller the resistance. R must therefore be inversely proportional to A. We now have: R = ρ·l / A I hope there are no mistakes here :P
Im doing an assignment for science and i need to know the nuclear charge of Aluminium?and also is there a difference between Aluminium and Aluminum or can it just be spelt differently?
Well aluminium can be spelt as aluminium or aluminum (American and European as Robert said). Aluminium ions can have many different levels of atomic charges but is mainly found as +1, +2 and +3. Having a +3 atomic charge is the most common form of aluminium ions. A single atom of the element aluminium (if not interfered with) has 13 protons and 13 electrons meaning it has an atomic charge of 0. Hope this helps.
Indeed, heat exchangers can make use of aluminum coils. Aluminum has gained popularity as a favored option for heat exchangers owing to its exceptional thermal conductivity, light weight, and resistance to corrosion. These coils usually find application in scenarios where heat transfer is necessary, such as HVAC systems, refrigeration units, and automotive radiators. Aluminum's high thermal conductivity enables efficient heat transfer, while its corrosion resistance guarantees durability and an extended lifespan for the heat exchanger. Moreover, aluminum coils can be effortlessly molded into different shapes and sizes, thereby showcasing their versatility for various heat exchanger designs.