1.やさしい
According to the Arrhenius definition, what does an acid produce in water?
- AOxide ions (O²⁻)
- BHydrogen ions (H⁺)
- CHydroxide ions (OH⁻)
- DSodium ions (Na⁺)
2.やさしい
What does the double arrow (⇌) in a chemical equation show?
- AThe reaction needs a catalyst
- BThe reaction is very fast
- CThe reaction is reversible
- DThe reaction releases heat
3.やさしい
Which technique is used to separate the different coloured dyes in an ink?
- AMagnetism
- BDistillation of the ink
- CFiltration
- DChromatography
4.ふつう
A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?
- AThe reaction is at equilibrium
- BThe reaction is endothermic
- CThe reaction needs a catalyst
- DThe reaction is exothermic
5.ふつう
Nitrogen is in group 15 of the periodic table. How many valence electrons does a nitrogen atom have?
- A7
- B5
- C15
- D3
6.ふつう
貴ガスがほとんど反応しないのはなぜか。
- Aすべて放射性だから
- B最外殻がすでに電子で満たされているから
- C原子が他の原子よりずっと大きいから
- D電子がまったくないから
7.むずかしい
6 M の原液から 2 M の溶液 300 mL をつくるには、原液が何 mL 必要か。
- A150 mL
- B100 mL
- C50 mL
- D900 mL
8.むずかしい
Why is it easier to remove the outer electron from a potassium atom than from a lithium atom?
- APotassium has fewer protons, so its nucleus pulls much more weakly on every electron
- BLithium has more electron shells than potassium
- CPotassium's outer electron is in a full shell
- DPotassium's outer electron is farther from the nucleus and more shielded by inner electrons
解答
- 1. B · Hydrogen ions (H⁺)
- 2. C · The reaction is reversible
- 3. D · Chromatography
- 4. D · The reaction is exothermic
- 5. B · 5
- 6. B · 最外殻がすでに電子で満たされているから
- 7. B · 100 mL
- 8. D · Potassium's outer electron is farther from the nucleus and more shielded by inner electrons
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