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What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

Explain which atom l or m is more stable and why

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat