At the equilibrium melting temperature of a solid, if an atom of solid changes to liquid, the change in the Gibbs free energy is equal to:
(a) The heat of fusion.
(b) Zero.
(c) A negative value.
(d) A positive value.
(b) Zero.
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Which of the following polymer combinations is least likely to mix?
(a) Liquids of two different long-chain molecules with a positive enthalpy of mixing. (b) A liquid solvent and solid polymer with solubility parameters of 19 MPa0.5 and 20 MPa0.5, respectively. (c) Liquids of two different long-chain molecules with a negative enthalpy of mixing. (d) Liquids of two different short molecules with a positive enthalpy of mixing.
The cosmic microwave background radiation was released shortly after the formation of the first stars
a. True b. False Indicate whether the statement is true or false
Constant Angular Acceleration: A pulley has an initial angular speed of 12.5 rad/s and a constant angular acceleration of 3.41 rad/s2. Through what angle does the pulley turn in 5.26 s?
A. 113 rad B. 22.6 rad C. 42.6 rad D. 19.3 rad E. 160 rad
Electrical current is
A. the same as electrical charge. B. the charge per unit time. C. the product of charge and time. D. the product of charge and potential difference.