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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?
