Acopper-nickel alloy of composition 50 wt% ni-50 wt% cu is slowly heated from a temperature of 1200°c (2190 °f).
(a) at what temperature does the first liquid phase form?
(b) what is the composition of this liquid phase?
(c) at what temperature does complete melting of the alloy occur?
(d) what is the composition of the last solid remaining prior to complete melting?

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explanation:

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warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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