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superconductor is a substance that is able to conduct electricity without resistance, a property that is very desirable in the construction of large electromagnets. Metals have this property if cooled to temperatures a few degrees above absolute zero, but this requires the use of expensive liquid helium (boiling point 4 K). Scientists have discovered materials that become superconductors at higher temperatures, but they are ceramics. Their brittle nature has so far prevented them from being made into long wires. A recently discovered compound of magnesium and boron, which consists of 52.9% Mg and 47.1% B, shows special promise as a high-temperature superconductor because it is inexpensive to make and can be fabricated into wire relatively easily. What is the formula of the compound?
The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray
Alexandra (who happens to weigh 130 pounds) has decided to start a training program bicycling for 45 minutes, 3 times/week as well as rock climbing for 1.5 hours every Saturday. How many extra calories will Alexandra burn in 8 weeks of training. W..
A 7.81g sample of HCN contains 0.289g of H as well as 4.05g of N. Determine the mass of carbon in a sample of HCN with a mass of 3.68g.
Explain why the first ionization energy trend tends to increase as one proceeds left to right across a period. Why is the first ionization of aluminum lower than that of magnesium and the first ionization of sulfer lower than that of phosphorus
A student has spilled some acid onto their arm. One lab partner suggests pouring some base on it to neutralize the acid but the TA quickly interjects that would be a bad idea and has the student begin washing their arm
What does the volume correction constant (b) in the van der Waals equation represent? Why is b for helium small (b = 0.0238 L /?mol) compared to b for decane (C10H22, b = 0.3043).
Question- Why does it take 10 water molecules to break down an oligosaccharide that contains 10 glucose units
4HCl(aq) + O2(g)--->2H2O(l) + 2Cl2(g) how many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of particles?
In 1773 Ben Franklin poured a teaspoon of oil onto a pond. He observed that it spread out to form a film that covered an area of about 22,000 ft2. If a teaspoon has a volume of about 5 cm3 and if the film was roughly one molecule thick, then what ..
In the interest of conserving fuel and funds, you keep the thermostat of your home/apartment at 15°C (59°F) throughout the winter months. You are able to tolerate this condition if the outside (ambient) air temperature exceeds -10°C (14°F) but fee..
How much work is required to lift a 3.00-kg object from the bottom of a well 10.0 m deep?
At 25 degrees celcius and 765 Torr, carbon dioxide has a solubility of 0.0342 M in water. What is the solubility at 25 degrees celcius and 2030 Torr. M
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