A.–1.1 t/yr
B.–2.6 t/yr
C.+1.1 t/yr
D.+2.6 t/yr
第1题
ge across thecapacitor to reach 6 V would have been closest to:
A.4.2 sec.
B.7.0 sec.
C.10.5 sec.
D.15.0 sec.
第2题
ans that white Sreflects:
A.2% of the 0.60 μm wavelength light that strikes its surface.
B.98% of the 0.60 μm wavelength light that strikes its surface.
C.2% of all the visible light that strikes its surface.
D.98% of all the visible light that strikes its surface.
第3题
ent1, but not inExperiments2 or 3?
A.Reaction temperature
B.Addition of NaCl
C.Addition of Fe
D.Surface area of Mg
第4题
uld have explodedin Earth’s atmosphere, a comet of similar size wouldmost likely have exploded at:
A.the same altitude.
B.a higher altitude.
C.a slightly lower altitude.
D.a much lower altitude.
第5题
rth’s sur-face. According to Figure 1, hornfels is most likely amember of which of the following facies?
A.Facies A
B.Facies C
C.Facies E
D.Facies G
第6题
ened by which of the following observations?
A.For a given organism, the amount of protein in the gametes is half that found in other types of cells.
B.For a given organism, the amount of protein in different types of cells is not the same.
C.Protein molecules are composed of many subunits.
D.Proteins are found only in the nucleus.
第7题
ared, the massof the solid will be greater.” Do the data in Table 1support his claim?
A.No; lead has a higher density than any of the liq-uids listed.
B.No; mercury has a higher density than any of the solids listed.
C.Yes; lead has a higher density than any of the liq-uids listed.
D.Yes; mercury has a higher density than any of the solids listed.
第8题
ry, a capaci-tor, and a constant resistance, as capacitance increases,the time required to reach a given voltage across thecapacitor increases. Do the experiments support thishypothesis?
A.Yes; in Experiment 1, as capacitance increased, the time required to reach a given voltage increased.
B.Yes; in Experiment 2, as capacitance increased, the time required to reach a given voltage increased.
C.No; in Experiment 1, as capacitance increased, the time required to reach a given voltage decreased.
D.No; in Experiment 2, as capacitance increased, the time required to reach a given voltage decreased.
第9题
e thesame acceleration factor?
A.At pH 5 only
B.At pH 6.7 only
C.At all pHs between 2 and 11
D.At none of the pHs shown in the figure
第10题
oducedforms an unreactive coating on the Mg surface. Whichof the following models for why NaCl speeds up thereaction is most consistent with this observation andthe results of the experiments?
A.NaCl absorbs heat produced in the reaction, causing the Mg(OH)2to melt off of the Mg surface.
B.NaCl binds with Fe to inhibit the reaction of Mg with H2O.
C.NaCl reacts with Mg(OH)2to form a stronger bar-rier against H2O.
D.NaCl reacts with Mg(OH)2, removing the coating from the Mg, allowing more contact with H2O.
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