What mass of potassium must react with water to produce 50.0 grams of \( \mathrm{H}_{2} \) ? \[ 2 \mathrm{~K}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(l) \rightarrow 2 \mathrm{KOH}(a q)+\mathrm{H}_{2}(g) \]

57. Rappresenta le equazioni delle seguenti reazioni specificando il nome dei prodotti. \( \begin{array}{ll}\text { a) ossidazione dell'esano } & \text { c) dibromurazione dell'esano } \\ \text { b) monoclorurazione del butano } & \text { d) ossidazione del propano }\end{array} \)

Which of these scholars laid the toundations tor modern chemistry?

The electronic configuration of one element is \(1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 3d^ { 10} 4s^ 1\). What is same group which is recently discovered?

Which is the correct Lewis structure for acetylene (\(C_ { 2} H_ { 2} \))?

3. จงอ่านชื่อของสารประกอบต่อไปนี้ 3.1 Bas