The melting points of some chemical elements are shown below. Nickel: 2,651 Mercury: -37.89 Helium: -458 Copper: 1,984.32 a) Which two elements have melting points that are closest in value? b) What is the average melting point of the substances? Round your answer to the nearest tenth. Explain how you got to the answer.

Mercury and helium

1034.8575

Step-by-step explanation:

Given that :

Melting point of substances :

Nickel: 2,651

Mercury: -37.89

Helium: -458

Copper: 1,984.32

Melting means change of solid to liquid

a) Which two elements have melting points that are closest in value?

The difference in Melting point between mercury and helium :

- 37.89 - (-458) = 420.11

Nickel and copper :

2651 - 1,984.32 = 666.68

Hence, element with melting point which are closest in value Are Mercury and helium

b) What is the average melting point of the substances?

Sum of the melting points / number of substances

(2,651 + (-37.89) + (-458) + 1,984.32) / 4

= 4139.43 / 4

= 1034.8575

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step-by-step explanation: