When a solution of ammonium chloride, NH4Cl, is added to a solution of lead(II) nitrate, Pb(NO3)2, a white precipitate of lead chloride, PbCl2, forms. Which of the following is the net ionic equation for this reaction?
A) 2 NH4Cl(aq) + Pb(NO3)2(aq) ? PbCl2(s) + 2 NH4NO3(aq)
B) 2 NH4+(aq) + 2 Cl-(aq) + Pb2+(aq) + 2 NO3-(aq) ?PbCl2(s) + 2 NH4+(aq) + 2 NO3-(aq)
C) Pb2+(aq) + 2 Cl-(aq) ? PbCl2(s)
D) Pb2+(aq) + Cl22-(aq) ? PbCl2(s)
C
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Provide one explanation of the formation of the cluster of small lakes about 1 mile (1.6 km) northeast of La Grange (near the southern margin of the map).
The question is based on Map T-11, the “Whitewater, Wisconsin” quadrangle (scale 1:62,500; contour interval 20 feet; dotted lines represent 10-foot contours), and Map T-27b, a shaded-relief map showing a portion of this area in greater detail. The irregular high ground of “Kettle Moraine State Forest,” running diagonally from the lower left to the right center of the map, is a terminal moraine left by a Pleistocene ice sheet 142°51'34"N, 88°35'59"W). The region northwest of the terminal moraine was once covered by the ice. The region in the southeast corner of the map is the edge of the glacial outwash plain. What will be an ideal response?
The function of the World Bank is to administer
A. Small local development grants B. Savings for major global corporations C. Small local aid D. Small international grants E. Major international development aid
Which of the following is not a method of caldera formation?
A) Collapse of magma chamber after large volumes of material are erupted B) Collapse of a composite cone summit following an explosive eruption C) Collapse of the flank of a cinder cone volcano after an effusive lava flow D) Collapse of summit of a shield volcano after draining of magma chamber
Recycling is less economically feasible in urban areas because of the high concentrations of recyclable materials.
Answer the following statement true (T) or false (F)