1.やさしい
Which of these is a polyatomic ion?
- ASulfate, SO₄²⁻
- BSodium, Na⁺
- COxide, O²⁻
- DChloride, Cl⁻
2.やさしい
ナトリウムとカリウムが属する族はどれか。
- Aハロゲン(17 族)
- Bアルカリ金属(1 族)
- Cアルカリ土類金属(2 族)
- D貴ガス(18 族)
3.やさしい
塩基はどれか。
- Aレモン果汁(クエン酸)
- B塩酸(HCl)
- C酢(酢酸)
- D水酸化ナトリウム(NaOH)
4.ふつう
pH 3 の溶液は、pH 5 の溶液と比べてどうか。
- A水素イオンが 100 倍多い
- B水素イオンの数が同じ
- C水素イオンが 100 分の 1 しかない
- D水素イオンが 2 倍多い
5.ふつう
Which coefficients balance __KClO₃ → __KCl + __O₂?
- A1, 1, 1
- B2, 2, 3
- C1, 1, 3
- D2, 1, 3
6.ふつう
A plastic block has a density of 0.8 g/cm³. What happens when it is placed in water (density 1.0 g/cm³)?
- AIt floats
- BIt stays suspended halfway down
- CIt dissolves
- DIt sinks
7.むずかしい
Why is gamma radiation used to sterilise sealed medical supplies such as syringes?
- AIt is stopped by the packaging, so it only cleans the outside
- BIt adds a protective chemical coating to the items
- CIt heats the items to very high temperatures, so the microbes are burned away inside the pack
- DIt passes through the packaging and kills microbes without making the items radioactive
8.むずかしい
Zinc reacts as Zn + 2HCl → ZnCl₂ + H₂. What mass of zinc (65 g/mol) reacts completely with 50 mL of 2 M HCl?
- A6.5 g
- B3.25 g
- C65 g
- D1.63 g
解答
- 1. A · Sulfate, SO₄²⁻
- 2. B · アルカリ金属(1 族)
- 3. D · 水酸化ナトリウム(NaOH)
- 4. A · 水素イオンが 100 倍多い
- 5. B · 2, 2, 3
- 6. A · It floats
- 7. D · It passes through the packaging and kills microbes without making the items radioactive
- 8. B · 3.25 g
ステップごとの詳しい解答:このトピックは examproblems.com で練習できます。