Exam 18: A Macroscopic Description of Matter

A certain metal has a coefficient of linear expansion of 2.00 × 10^-5 K^-1.It has been kept in a laboratory oven at 325°C for a long time.It is now removed from the oven and placed in a freezer at -145°C.After it has reached freezer temperature,the percent change in its density during this process is closest to

When a solid melts,

3.00 moles of an ideal gas at a pressure of 250 kPa are held in a container of volume of 25.0 L.The ideal gas constant is R = 8.314 J/mol ∙ K = 0.0821 L ∙ atm/mol ∙ K,and 1 atm = 1.01 × 10⁵ Pa.The temperature of this gas is closest to

The exterior of a supersonic airplane is made of aluminum,which has a coefficient of linear expansion of 24 × 10^-6 K^-1.At 15°C,the plane measures 62.1 m in length.When the plane is in flight,friction with the air increases the temperature of the exterior skin to 200°C.What is the change in the length of the outer skin of the plane?

If the temperature of an iron sphere is increased,

An ideal gas is at a pressure 1.00 × 10⁵ N/m² and occupies a volume 2.00 m³.If the gas is compressed to a volume 1.00 m³ while the temperature remains constant,what will be the new pressure in the gas?