- Rusting bicycle is a physical or chenical change?

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What is the Ka of a 0.0796 M solution of nitrous acid (HNO2) with a pH of 2.95?
Please help!? What is the mass, in kg, of silver contained in a 3.5-liter container if its density is 11 g/mL? Describe the difference between real and complex roots. What might be the reason for using a complex root to describe a situation? Air conditioning equipment, fan coils, minisplit, among others, generate sparks? for an explosion-proof installation? MATH HELP!! Given that f(x)=2x+1. find the value of f(x+h). Explanation please.?