1.やさしい
What is the change from a gas directly to a solid, skipping the liquid state, called?
- ADeposition
- BFreezing
- CSublimation
- DCondensation
2.やさしい
In a chemical reaction, what is the limiting reactant?
- AThe catalyst that controls the speed
- BThe reactant with the largest mass
- CThe reactant that runs out first and stops the reaction
- DThe reactant that is left over at the end
3.やさしい
According to the Arrhenius definition, what does an acid produce in water?
- ASodium ions (Na⁺)
- BHydrogen ions (H⁺)
- COxide ions (O²⁻)
- DHydroxide ions (OH⁻)
4.ふつう
In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?
- AZn
- BCu²⁺
- CCu
- DZn²⁺
5.ふつう
What colour is phenolphthalein indicator in a basic solution?
- AColourless
- BBlue
- CPink
- DYellow
6.ふつう
A solution has a pH of 2. What is its hydrogen ion concentration?
- A1 × 10² mol/L
- B1 × 10⁻² mol/L
- C2 mol/L
- D1 × 10⁻¹² mol/L
7.むずかしい
反応 CuO + H₂ → Cu + H₂O で、還元される物質はどれか。
- A水。生成するから
- B銅。電子を失うから
- C酸化銅。銅が電子を得るから
- D水素。酸素を得るから
8.むずかしい
Why does a burn from steam at 100 °C usually cause more damage than one from liquid water at 100 °C?
- ALiquid water cannot pass any of its heat to the skin
- BSteam carries dissolved acid that damages the skin
- CSteam releases a large amount of extra energy as it condenses on the skin
- DSteam particles are hotter than water particles at the same reading
解答
- 1. A · Deposition
- 2. C · The reactant that runs out first and stops the reaction
- 3. B · Hydrogen ions (H⁺)
- 4. A · Zn
- 5. C · Pink
- 6. B · 1 × 10⁻² mol/L
- 7. C · 酸化銅。銅が電子を得るから
- 8. C · Steam releases a large amount of extra energy as it condenses on the skin
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