1.やさしい
固体から直接気体への変化を何と呼ぶか。
- A凝華
- B融解
- C凝縮
- D昇華
2.やさしい
物理変化はどれか。
- A鉄がさびる
- Bパンがこんがり焼けて茶色くなる
- C牛乳が酸っぱくなる
- D水が沸騰して水蒸気になる
3.やさしい
What does the subscript 2 in H₂O tell you?
- AEach molecule contains two hydrogen atoms
- BWater has a charge of 2
- CEach molecule contains two oxygen atoms
- DThere are two water molecules
4.ふつう
Nitrogen is in group 15 of the periodic table. How many valence electrons does a nitrogen atom have?
- A15
- B5
- C3
- D7
5.ふつう
How does evaporation differ from boiling?
- AEvaporation happens only at the surface and at any temperature; boiling happens throughout the liquid at a set temperature
- BEvaporation needs a higher temperature than boiling
- CEvaporation happens throughout the liquid at a set temperature; boiling happens only at the surface
- DEvaporation produces a solid, while boiling produces a gas
6.ふつう
What feature makes a hydrocarbon an alkene?
- AAt least one carbon–carbon double bond
- BAn –OH group
- COnly carbon–carbon single bonds
- DA ring of six carbon atoms with no hydrogen
7.むずかしい
中和反応はどれか。
- ACH₄ + 2O₂ → CO₂ + 2H₂O
- B2H₂O → 2H₂ + O₂
- CH₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
- DZn + CuSO₄ → ZnSO₄ + Cu
8.むずかしい
グルコースC₆H₁₂O₆ の 1 分子には、原子がいくつあるか。
- A18
- B3
- C24
- D72
解答
- 1. D · 昇華
- 2. D · 水が沸騰して水蒸気になる
- 3. A · Each molecule contains two hydrogen atoms
- 4. B · 5
- 5. A · Evaporation happens only at the surface and at any temperature; boiling happens throughout the liquid at a set temperature
- 6. A · At least one carbon–carbon double bond
- 7. C · H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
- 8. C · 24
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