An ideal gas with an initial volume of 4.07 L is cooled at constant pressure to 25.0°C where its final volume is 3.41 L. What
was the temperature initially (in degrees Celsius)?

pure substance: iron,copper

impure substance: water,charcoal

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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.

hope i !