Multiple Choice
Which of the following is true about the general trend of first ionization energies in transition metals?
24. Transition Metals and Coordination Compounds
Atomic Radius & Density of Transition Metals
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Consider the phase diagram for the Cr–V alloy. At 1800℃, starting with pure chromium, what phase changes will occur as the percentage of vanadium is gradually increased until you reach pure vanadium?
A
solid – liquid
B
liquid – solid
C
Solid – liquid – solid
D
liquid – solid – liquid
E
always solid
F
always liquid
Verified step by step guidance1
Examine the phase diagram provided for the Cr-V alloy. The x-axis represents the mole percent of vanadium, and the y-axis represents the temperature in degrees Celsius.
Identify the temperature of interest, which is 1800°C, and draw a horizontal line across the phase diagram at this temperature.
Observe where this horizontal line intersects the phase boundaries. Initially, at 0% vanadium (pure chromium), the line is in the 'Solid alloy' region.
As the percentage of vanadium increases, the line crosses into the 'Liquid' region, indicating a phase change from solid to liquid.
Continuing to increase the vanadium percentage, the line eventually crosses back into the 'Solid alloy' region, indicating another phase change from liquid to solid. Thus, the phase changes are solid to liquid to solid as vanadium is increased from 0% to 100% at 1800°C.
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