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Which of the following is a metalloid?


A) Carbon, C, Z = 6
B) Sulfur, S, Z = 16
C) Germanium, Ge, Z = 32
D) Iridium, Ir, Z = 77
E) Bromine, Br, Z = 35

F) A) and D)
G) C) and E)

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Which of these pairs of elements would be most likely to form an ionic compound?


A) P and Br
B) Cu and K
C) C and O
D) O and Zn
E) Al and Rb

F) A) and B)
G) A) and C)

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The fact that the complete reaction of 48.6 g of magnesium with 32.0 g of oxygen forms exactly 80.6 g of magnesium oxide illustrates


A) the law of definite proportions.
B) the law of conservation of mass.
C) the law of multiple proportions.
D) Dalton's description of the atom.

E) A) and B)
F) A) and C)

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Iron(III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes. What is its formula?


A) Fe(Cl路6H2O) 3
B) Fe3Cl路6H2O
C) FeCl3(H2O) 6
D) Fe3Cl(H2O) 6
E) FeCl3路6H2O

F) A) and B)
G) All of the above

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