1.やさしい
DNA belongs to which group of biological molecules?
- ACarbohydrates
- BProteins
- CNucleic acids
- DLipids
2.やさしい
How many millilitres are in 1 litre?
- A1000
- B10
- C10,000
- D100
3.やさしい
According to the Arrhenius definition, what does a base produce in water?
- ACarbonate ions (CO₃²⁻)
- BChloride ions (Cl⁻)
- CHydrogen ions (H⁺)
- DHydroxide ions (OH⁻)
4.ふつう
Water can act as an acid in some reactions and as a base in others. What is such a substance called?
- ASaturated
- BIsotonic
- CAmphoteric
- DNeutral
5.ふつう
Which coefficients balance __Na + __Cl₂ → __NaCl?
- A2, 1, 2
- B1, 1, 1
- C2, 2, 1
- D1, 2, 1
6.ふつう
電気陰性度が最も大きい元素はどれか。
- A鉄
- Bナトリウム
- Cヘリウム
- Dフッ素
7.むずかしい
In the Bohr model, what happens when an electron drops from a higher energy level to a lower one?
- AEnergy is absorbed from the surroundings
- BEnergy is released, often as light
- CThe atom gains a proton
- DThe electron leaves the atom
8.むずかしい
Each C=O bond in carbon dioxide is polar, yet the CO₂ molecule is nonpolar. Why?
- ACarbon and oxygen have the same electronegativity
- BThe molecule is linear, so the two bond dipoles cancel out
- CCarbon has lone pairs that cancel the dipoles
- DThe bonds are ionic, not covalent
解答
- 1. C · Nucleic acids
- 2. A · 1000
- 3. D · Hydroxide ions (OH⁻)
- 4. C · Amphoteric
- 5. A · 2, 1, 2
- 6. D · フッ素
- 7. B · Energy is released, often as light
- 8. B · The molecule is linear, so the two bond dipoles cancel out
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