Chemistry - June 2011

6 Which element has the highest melting point?

(1) tantalum   (3) osmium
(2) rhenium    (4) hafnium

7 In a chemical reaction, there is conservation of

(1) energy, volume, and mass
(2) energy, volume, and charge
(3) mass, charge, and energy
(4) mass, charge, and volume

8 At STP, both diamond and graphite are solids composed of carbon atoms. These solids have

(1) the same crystal structure and the same properties
(2) the same crystal structure and different properties
(3) different crystal structures and the same properties
(4) different crystal structures and different properties

9 The gram-formula mass of a compound is 48 grams. The mass of 1.0 mole of this compound is

(1) 1.0 g    (3) 48 g
(2) 4.8 g    (4) 480 g

10 Given the balanced equation representing a reaction:

What occurs during this reaction?

(1) A bond is broken as energy is absorbed.
(2) A bond is broken as energy is released.
(3) A bond is formed as energy is absorbed.
(4) A bond is formed as energy is released.

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