Predict the diffusion coefficient of acetone (CH3COCH3) in water at 25°C and 50°C using the Wilke-Chang equation. The experimental value is 1.28x10-9 m2/s at 25°C. (Viscosity of water at 25°C is 0.8937x10-3 Pa. s and at 50°C, 0.5494x10-3 Pa. s. Molar volume of acetone is 0.074 m3/kgmol.)

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

When an object is heated it contracts. a. true b. false

The necleus of an atom is made up of what subatomic particles?