. State whether each of the following samples of matter is a gas. If there is not enough information for you to decide, write "insufficient information."
(a) A material is in a steel tank at 100 atm pressure. When the tank is opened to the atmosphere, the material suddenly expands, increasing its volume by 10%.
(b) A 1.0-mL sample of material weighs 8.2 g.
(c) The material is transparent and pale green in color.
(d) One cubic meter of material contains as many molecules as 1.0 m3 of air at the same temperature and pressure.
To determine whether each sample of matter is a gas or not, we need to analyze the given information.
(a) In this case, a material is in a steel tank at 100 atm pressure. When the tank is opened to the atmosphere, the material suddenly expands, increasing its volume by 10%. The fact that the material expands when the tank is opened indicates that it is a gas. Therefore, the answer to (a) is: It is a gas.
(b) In this case, we are given that a 1.0-mL sample of material weighs 8.2 g. This information alone is insufficient to determine whether the material is a gas or not. The weight of a material does not provide direct information about its state. Therefore, the answer to (b) is: Insufficient information.
(c) In this case, we are told that the material is transparent and pale green in color. This information does not directly indicate the state of matter. Transparency and color can be characteristics of different states, such as gases, liquids, or solids. Therefore, the answer to (c) is: Insufficient information.
(d) In this case, it is stated that one cubic meter of the material contains as many molecules as 1.0 m3 of air at the same temperature and pressure. Since the comparison is made based on the number of molecules, we can conclude that both the material and air are in the gaseous state. Therefore, the answer to (d) is: It is a gas.
In summary:
(a) It is a gas.
(b) Insufficient information.
(c) Insufficient information.
(d) It is a gas.