1.やさしい
Which element has the symbol Fe?
- AFrancium
- BIron
- CFluorine
- DFermium
Which element has the symbol Fe?
What is the chemical formula of carbon dioxide?
反応 AB → A + B は、どの種類の反応か。
Al³⁺ とO²⁻ のイオンからなる酸化アルミニウムの化学式はどれか。
Why does water boil at a lower temperature at the top of a high mountain?
How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?
What is the formula of calcium phosphate, made from Ca²⁺ and PO₄³⁻ ions?
What is the oxidation number of manganese in potassium permanganate, KMnO₄?
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