1.やさしい
What colour does blue litmus paper turn in an acid?
- ABlue (no change)
- BPurple
- CGreen
- DRed
What colour does blue litmus paper turn in an acid?
What is oxidation, in terms of electrons?
What is the formula of methane, the main gas in natural gas?
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。
0.5 mol of KCl is dissolved to make 250 mL of solution. What is its molarity?
Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?
How many millilitres of 0.2 M NaOH are needed to neutralise 25 mL of 0.1 M HCl?
Which compound contains both ionic and covalent bonds?
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