1.简单
Apart from mercury, which element is a liquid at room temperature?
- ABromine
- BSodium
- CChlorine
- DIodine
Apart from mercury, which element is a liquid at room temperature?
下列哪一项是化合物?
钠的化学符号是什么?
In a closed container, 10 g of substance A reacts completely with 5 g of substance B. What is the total mass of the products?
氧原子有多少个价电子(最外层电子)?
What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?
Methane burns as CH₄ + 2O₂ → CO₂ + 2H₂O. What mass of CO₂ (44 g/mol) forms from 16 g of CH₄ (16 g/mol)?
下列哪种溶液导电性最好?
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