- Describe how lines in an emission spectrum of hydrogen are given off?

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What is the lethal dose of mercury? 217 mL of HCl is exactly neutralized with 383 mL 0.320 M calcium hydroxide solution. What is the concentration of the acid solution? What are the coordinates of the endpoints of the midsegment for △JKL that is parallel to KL¯¯¯¯¯? Will give best answer ty? Derive an expression for curvature correction and combined curvature and refraction correction? Https://www.afingerlings.com/ - is this a valid website?