Which of the following choices will have the lowest observed viscosity?  

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

d. Frost (ice) forms on the walls of a freezer unit of a refrigerator.

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

c. Heat is removed from 125 g of liquid water at 0 °C.

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

b. Snow on the ground turns to liquid water.

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

a. Dry ice in an ice-cream cart disappears.

Nitric acid, which is used in the production of fertilizers, plastics and dyes, has a melting point of – 42ºC and a boiling point of 83ºC. Determine its physical state at a temperature of 110ºC.

Indicate whether each of the following describes a gas, a liquid, or a solid:

c. Helium occupies the entire volume of a balloon.

Indicate whether each of the following describes a gas, a liquid, or a solid:

b. The particles in a tank of oxygen are very far apart.

Indicate whether each of the following describes a gas, a liquid, or a solid:

a. Lemonade has a definite volume but takes the shape of its container