1.やさしい
Which of these is a polyatomic ion?
- AOxide, O²⁻
- BSulfate, SO₄²⁻
- CChloride, Cl⁻
- DSodium, Na⁺
2.やさしい
What kind of carbon–carbon bonds do alkanes contain?
- AAt least one triple bond
- BOnly single bonds
- CIonic bonds
- DAt least one double bond
3.やさしい
What is the SI unit of energy?
- AKelvin
- BWatt
- CNewton
- DJoule
4.ふつう
How does a catalyst speed up a reaction?
- AIt provides a different pathway with a lower activation energy
- BIt adds extra reactant to the mixture
- CIt raises the temperature of the reactants so they move faster
- DIt makes the reaction more exothermic
5.ふつう
On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?
- AReversible only
- BEndothermic
- CNuclear
- DExothermic
6.ふつう
What is the molar mass of sodium chloride, NaCl (Na = 23, Cl = 35.5 g/mol)?
- A23 g/mol
- B12.5 g/mol
- C81.5 g/mol
- D58.5 g/mol
7.むずかしい
Which pair of substances could form a buffer solution?
- ASodium chloride (NaCl) and water
- BCarbonic acid (H₂CO₃) and bicarbonate (HCO₃⁻)
- CHydrochloric acid (HCl) and sodium hydroxide (NaOH)
- DHydrochloric acid (HCl) and chloride (Cl⁻)
8.むずかしい
可逆反応における触媒について、正しい記述はどれか。
- A正反応だけを速め、逆反応を止める
- B両方向を同じように速める
- C平衡時の生成物の量を増やす
- D反応が進むにつれて消費される
解答
- 1. B · Sulfate, SO₄²⁻
- 2. B · Only single bonds
- 3. D · Joule
- 4. A · It provides a different pathway with a lower activation energy
- 5. D · Exothermic
- 6. D · 58.5 g/mol
- 7. B · Carbonic acid (H₂CO₃) and bicarbonate (HCO₃⁻)
- 8. B · 両方向を同じように速める
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