Sunday, August 12, 2012

chemistry




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At 1 atmosphere of pressure, 25.0 grams of a compound at its boiling point is converted to a gas by the addition of 8,180 calories. What is the heat of vaporization for this compound, in calories per gram?

A. 25.0 cal/g
B. 327 cal/g
C. 540 cal/g
D. 8,140 cal/g

Which substance can be decomposed chemically?

A. CaO and Ca
B. MgO and Mg
C. CO and Co
D. CaO and MgO

The particles of a substance are arranged in a definite shape geometric pattern and are constantly vibrating. This substance can be in 

A. The solid phase, only
B. The liquid phase, only
C. Either the liquid or the solid phase
D. Neither the liquid or the solid phase

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