Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction? Upper F subscript 2 (l) plus upper N a (s) right arrow upper N a upper F subscript 2 (s).
Upper F subscript 2 (g) plus upper C a (s) right arrow upper C a upper F subscript 2 (l).
Upper F subscript 2 (g) plus upper N a (s) right arrow with delta above upper N a upper F subscript 2 (l)
Upper F subscript 2 (g) plus upper C a (s) right arrow with delta above upper C a upper F subscript 2 (s).

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

i don,t know so just answer mine

wher is the rest of the question

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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