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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 [tex]$1000^{\circ} C$[/tex], which is the highest temperature her heater allows. The metal doesn't melt. Which type of metal does the chemist have?

\begin{tabular}{|l|l|l|}
\hline
Material & Melting Point [tex]$\left({ }^{\circ} C\right)$[/tex] & Electrical Conductivity Ranking \\
\hline
aluminum & 660 & 3 \\
\hline
copper & 1085 & 2 \\
\hline
zinc & 420 & 4 \\
\hline
silver & 962 & 1 \\
\hline
nickel & 1455 & 5 \\
\hline
\end{tabular}

A. aluminum
B. copper
C. zinc
D. silver
E. nickel

Sagot :

GinnyAnswer
To solve this problem, we need to consider two conditions about the metal:

1. The metal must not melt at temperatures up to [tex]\( 1000^\circ C \)[/tex].
2. The metal must have the best electrical conductivity among the provided options.

First, let's review the melting points of the metals from the table:
- Aluminum: [tex]\( 660^\circ C \)[/tex]
- Copper: [tex]\( 1085^\circ C \)[/tex]
- Zinc: [tex]\( 420^\circ C \)[/tex]
- Silver: [tex]\( 962^\circ C \)[/tex]
- Nickel: [tex]\( 1455^\circ C \)[/tex]

The metals that do not melt at [tex]\( 1000^\circ C \)[/tex] are:
- Copper (melting point [tex]\( 1085^\circ C \)[/tex])
- Nickel (melting point [tex]\( 1455^\circ C \)[/tex])

Next, we look at the electrical conductivity rankings to find which of these metals is the best conductor:
- Copper: Electrical Conductivity Rank 2
- Nickel: Electrical Conductivity Rank 5

Since the metal that doesn't melt at [tex]\( 1000^\circ C \)[/tex] and has the best electrical conductivity must have the lowest rank in the ranking system, we compare the ranks:
- Copper has a rank of 2.
- Nickel has a rank of 5.

Therefore, the metal the chemist has must be copper, as it doesn't melt at [tex]\( 1000^\circ C \)[/tex] and has the best electrical conductivity among the options.

So, the correct answer is:

B. copper
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