Chemistry, 15.04.2020 00:19 leonardkaren41ovlx1q
The thermite reaction was once used to weld rails: 2Al (s) + Fe2O3 (s) Al2O3 (s) + 2Fe (s) a) Using heat of formation data (see your textbook), calculate ΔH for this reaction b) Take the specific heats of Al2O3 and Fe to be 0.77 and 0.45 J/g∙°C, respectively. Calculate the temperature to which the products of this reaction will be raised, starting at room temperature, by the heat given off in the reaction. c) What assumption(s) do you have to make in answering part b)? d) Will the reaction produce molten iron (melting point Fe = 1535°C, ΔHfus = 270 J/g) ?
Answers: 1
Chemistry, 22.06.2019 08:00, katelyn0579
Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely. analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?
Answers: 1
Chemistry, 22.06.2019 12:30, azzyla2003
Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17
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Chemistry, 22.06.2019 21:00, melissalopez12
Acandle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. the wick is usually surrounded by wax. which is the most important property of covalent compounds that makes them useful for making candle wax? a low boiling point a low melting point a high boiling point a high melting point
Answers: 1
The thermite reaction was once used to weld rails: 2Al (s) + Fe2O3 (s) Al2O3 (s) + 2Fe (s) a) Usin...
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