1.やさしい
固体から直接気体への変化を何と呼ぶか。
- A凝縮
- B昇華
- C凝華
- D融解
2.やさしい
周期表の縦の列を何と呼ぶか。
- A系列
- B殻
- C周期
- D族
3.やさしい
What are enzymes?
- ABiological catalysts, usually proteins
- BSugars that store energy in the liver
- CMinerals that build bone
- DFats that form most of the cell membrane
4.ふつう
How does ionisation energy (the energy needed to remove an outer electron) generally change from left to right across a period?
- AIt decreases
- BIt first falls, then rises sharply
- CIt increases
- DIt stays the same
5.ふつう
水分子が極性をもつのはなぜか。
- A水素のほうが酸素より電気陰性度が大きいから
- B水分子は直線で、2 つの水素が一直線上にあるから
- C酸素が共有電子対をより強く引きつけ、分子が折れ曲がっているから
- D水素と酸素の間がイオン結合だから
6.ふつう
What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?
- A0
- B+1
- CIt equals the group number
- D−1
7.むずかしい
Gently heating DNA separates its two strands, but each strand stays in one piece. Why?
- AThe strands are held together by weak hydrogen bonds, while each strand's backbone is covalent
- BEach strand is held together by hydrogen bonds, while the two strands are joined by covalent bonds
- CThe two strands are joined by ionic bonds that melt first
- DHeat converts DNA into a protein
8.むずかしい
How does a rise in temperature affect how much carbon dioxide gas can dissolve in a soft drink?
- ALess gas dissolves, so warm drinks go flat faster
- BThe gas turns into a solid at higher temperature
- CMore gas dissolves, so warm drinks stay fizzy for longer
- DTemperature has no effect on gas solubility
解答
- 1. B · 昇華
- 2. D · 族
- 3. A · Biological catalysts, usually proteins
- 4. C · It increases
- 5. C · 酸素が共有電子対をより強く引きつけ、分子が折れ曲がっているから
- 6. A · 0
- 7. A · The strands are held together by weak hydrogen bonds, while each strand's backbone is covalent
- 8. A · Less gas dissolves, so warm drinks go flat faster
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