From the information provided in question, the metal is copper.
The specific heat capacity of a substance is an intrinsic property. It can be used to identify a substance. Intrinsic properties are characteristic of substances. From the information provided, we can obtain the specific heat capacity of the metal.
Using;
H = mcdT
Where;
H = Heat absorbed
m = mass of the metal
c = specific heat capacity of the metal
dT = temperature change
20 J = 0.0052 Kg × c × ( 40.0°C - 30.0°C)
c = 20 J/0.0052 Kg × ( 40.0°C - 30.0°C)
c = 385 JKg-1°C-1
The metal is copper.
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