Achemist is trying to identify a sample of metal that is listed in this table. she passes an electrical current through the sample and finds that, of the metals listed in the table, it’s one of the best conductors. then she heats the metal to 1000°c, which is the highest temperature her heater allows. the metal doesn’t melt. which type of metal does the chemist have?
material melting point (°c) electrical conductivity ranking
aluminum 660 3
copper 1085 2
zinc 420 4
silver 962 1
nickel 1455 5
The correct option is E.
From the information given in the question, we are told that the metal is one of the best conductors and it has melting point that is greater than 1000 degree Celsius. This implies that, options A, C and D can be eliminated, because they have melting points that are less than 1000 degree Celsius. We now have copper and nickel left, but the electrical conductivity of nickel, which is 5 is greater than that of copper, which is 2, although the two of them have melting points that are greater than 1000. Thus, the metal that the chemist was working with is NICKEL.
Copper and Nickel both have melting points above 1000°C so the correct answer is between these two. And because the chemist is dealing with one of the best conductors of electricity and copper is second in the list, that means that copper is the correct answer.
A chemist is trying to identify a sample of metal that is listed in this table. She passes an electrical current through the sample and finds that, of the metals listed in the table, it’s one of the best conductors. Then she heats the metal to 1000°C, which is the highest temperature her heater allows. The metal doesn’t melt. Which type of metal does the chemist have?
MetalMelting Point CelsiusMelting Point Fahrenheit
Brass (85 Cu 15 Zn)900-9401652-1724
Bronze (90 Cu 10 Sn)850-10001562-832
Red Brass990 – 10251810 – 1880
Yellow Brass905 – 9321660 – 1710
the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .