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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?
Question- Explain (using chemical equations) what happens when iron pyrite in mine tailings is exposed to air. What are some of the environmental consequences of this
A 486 mL sample of water was cooled from 50.0°C to 10.0°C. Assuming a specific heat of 4.184 J/K g and a density of 1.00 g/mL, find the amount of heat transferred from the water to the surroundings.
Protein Quantification why is it more useful to plot absorbance vs. weight units(mg/ml) instead of absorbance vs. molar concentration?
sample of this compound is combusted in excess oxygen and the products are 2.492 g of CO2 and 0.6495 g of H20. Determine the empirical formula of the active ingredient.
Determine the pH of a solution with .12M of sodium acetate at 25 degrees C. Ka=1.8x10^-5
What is the mole percent of ethanol C2H5OH which consists of 71.0g of ethanol for every 18.3grams of water present
structures of all cycloalkenes that yield n-propyl cyclopentane when subjected to catalytic hydrogenation
Phosphate buffer is a commonly used buffer for biological experiments. The buffer is made by combining H2PO4- (pKa = 7.21) and HPO42-.
A molecule with a chiral center must be optically active whereas a molecule with two chiral centers may or may not be optically active. Explain and provide examples.
You dissolve 12.6352 g of potassium iodide in water and bring the volume of solution to 250.0 ml. What is the molar concentration of KI and what volume of 0.0436 molar hydrochloric acid is required to react with 30.0 ml of 0.0278 molar LiOH?
Explain if the standard enthalpy of formation of ammonia vapor at 298K is -46.11kJ/mol. Determine its standard enthalpy of formation at 360K, specified that the molar heat capacities of the reactants as well as products are given by: Cpm = a + bT ..
State the mechanism of the polymerization between 1,12-dodecane diacid chloride as well as dodecamethylenediamine (DMDA)
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