True or False: The specific heat capacities of metals are relatively low. True F

Question

True or False: The specific heat capacities of metals are relatively low. True False Consider the reaction H_2(g) + 1/2O_2 (g) rightarrow H_2O(I) delta H" = -286 kJ Which of the following is true? The reaction is exothermic The reaction is endothermic The enthalpy of the products is less than that of the reactants Heat is absorbed by the system. Both A and C are true. True or False When a system performs work on the surroundings, the work is reported with a negative sign True False True or False: A state function does not depend on the system's past or future. True False What volume is occupied by 21.0 g of methane (CH_4) at 27 degree C and 1.25 atm? (MM methane is 16.05 g'mol) (R = 0.08206 L atm/mol K) 25.8 L 4.14 times 10^2 L 2.32 L not enough data to calculate 37.2 L

Explanation / Answer

7. True.

The specific heat capacity of metals are relatively low when compared to water and non metals.

Specific heat capacity is a measure of the thermal energy needed to raise the temperature of 1 gram of a specific substance by 10 C. In metals the atoms are tightly bound. This enables them to transfer heat from one atom to another by conduction. Hence less energy is required to heat metals as energy transfer is most efficient. In water the atoms are likely packed as it is a liquid so more energy is required to heat.

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