1.やさしい
What is a molecule?
- AA single atom with a positive charge
- BTwo or more atoms held together by covalent bonds
- CA mixture of two different elements
- DThe nucleus of an atom
2.やさしい
Which is a sign that a chemical reaction may have taken place?
- ASugar dissolves completely when stirred into water
- BWater freezes into ice when put in a freezer
- CA gas is produced when two liquids are mixed
- DA block of wax melts when it is heated
3.やさしい
化合物はどれか。
- Aヘリウム(He)
- B酸素ガス(O₂)
- C二酸化炭素(CO₂)
- D鉄(Fe)
4.ふつう
What is the mass of 0.5 mol of NaCl (molar mass 58.5 g/mol)?
- A0.5 g
- B58.5 g
- C117 g
- D29.25 g
5.ふつう
Glucose has the molecular formula C₆H₁₂O₆. What is its empirical formula?
- ACHO
- BC₂H₄O₂
- CCH₂O
- DC₆H₁₂O₆
6.ふつう
水素結合とは何か。
- AH₂ における 2 つの水素原子間の共有結合
- B水素イオンと金属の間のイオン結合
- C水素の原子核内の結合
- Dある分子の水素と、別の分子のO、N、F原子との間の引力
7.むずかしい
Which compound contains both ionic and covalent bonds?
- ASodium sulfate, Na₂SO₄
- BWater, H₂O
- CSodium chloride, NaCl
- DMethane, CH₄
8.むずかしい
In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?
- ANa⁺
- BCl₂
- CNa
- DNaCl
解答
- 1. B · Two or more atoms held together by covalent bonds
- 2. C · A gas is produced when two liquids are mixed
- 3. C · 二酸化炭素(CO₂)
- 4. D · 29.25 g
- 5. C · CH₂O
- 6. D · ある分子の水素と、別の分子のO、N、F原子との間の引力
- 7. A · Sodium sulfate, Na₂SO₄
- 8. B · Cl₂
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