When a substance melts at its normal melting point, the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.
A. +, –
B. -, +
C. +, +
D. -, –
Answer:C
When a substance melts at its normal melting point, the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.
A. +, – B. -, + C. +, + D. -, –