Which of the following is a noncrystalline solid that has no defined melting point?
A) quartz
B) glass
C) cement
D) mica
Question 2
Consider the following reaction: 2 Fe + 3 Mg2+ 2 Fe3+ + 3 Mg The half-reaction for the reduction in this reaction is
A) Fe Fe3+ + 3 e-
B) Fe3+ + 3 e- Fe
C) Mg Mg2+ + 2 e-
D) Mg2+ + 2 e- Mg
Question 3
Which of the following problems is NOT created by the production of cement?
A) Particulate material can result from mining of the limestone.
B) Smoke and sulfur dioxide from the burning of fossil fuels increase air pollution.
C) Incineration at high temperature is needed to destroy toxic organic wastes.
D) It requires extensive mining of limestone, and large mountains and hills are being destroyed.
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