Mechanical Engineering Unit 7 Unit Review Questions Answer Keygo Back Index What Matteranything That Has Mass

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UNIT 7 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX

7-1) What is matter?

7-2) What is the difference between an atom and molecule?

7-3) List the three states of matter in order of their energy level from lowest to

highest.

7-4) Explain the difference between the weight of an object and the mass of an

object.

7-5) Calculate the density, specific volume, and specific gravity of a gas that

occupies 20 ft3and weighs 2 lb.

7-6) If the gas in question 5 was released in a room, would it be more likely to be

found near the ceiling or near the floor?

7-7) Calculate the density, specific volume, and specific gravity of a solid that

occupies 3 ft3and weighs 9 lb.

7-8) If the solid in question 7 was placed in water, would it sink orfloat?

7-9) Explain the relationship between specific volume and density.

They use the same information, but backwards from each other. Substances

7-10) What is the ARI definition of standard air?

7-11) Why are testing standards important when specifying density and specific

volume?

7-12) What is the difference between the melting and freezing points?

7-13) What effect does pressure have on the boiling temperature of a liquid?

7-14) What is the temperature of the water formed when ice melts?

7-15) Give a practical application in the HVACR industry for specific gravity.

The capacity of fuel gas lines is affected by the specific gravity of the gas.

7-17) What is a substance’s critical point?

7-18) What are the two general categories for properties of matter?

7-19) What physical change of state is the opposite of boiling?

7-20) What physical change of state is the opposite of sublimation?