1.やさしい
An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?
- AA combustion reaction
- BA neutralisation reaction
- CEndothermic
- DExothermic
2.やさしい
What is the name of the polyatomic ion NH₄⁺?
- ANitride
- BAmmonium
- CAmmonia
- DNitrate
3.やさしい
発熱反応とは何か。
- A周囲から熱を吸収する反応
- B周囲に熱を放出する反応
- Cエネルギーがまったく変化しない反応
- D開始に光を必要とする反応
4.ふつう
How does a catalyst speed up a reaction?
- AIt raises the temperature of the reactants so they move faster
- BIt provides a different pathway with a lower activation energy
- CIt adds extra reactant to the mixture
- DIt makes the reaction more exothermic
5.ふつう
Which gas forms when hydrochloric acid reacts with calcium carbonate?
- AChlorine
- BOxygen
- CHydrogen
- DCarbon dioxide
6.ふつう
How can you get solid salt back from salt water?
- AFilter the solution
- BEvaporate the water
- CUse a magnet
- DFreeze the solution and lift out the salt
7.むずかしい
原子半径が大きくなる順に元素を並べているのはどれか。
- AC, N, O, F
- BO, F, N, C
- CNa, Mg, Al, Si
- DF, O, N, C
8.むずかしい
Steel can be protected from rusting by coating it with zinc (galvanising). Why does the steel stay protected even if the zinc coating is scratched?
- AZinc is more reactive than iron, so it corrodes instead of the iron
- BZinc absorbs all the water from the air
- CZinc is less reactive than iron, so it pushes oxygen and water away from the iron
- DZinc turns the iron into a noble metal
解答
- 1. C · Endothermic
- 2. B · Ammonium
- 3. B · 周囲に熱を放出する反応
- 4. B · It provides a different pathway with a lower activation energy
- 5. D · Carbon dioxide
- 6. B · Evaporate the water
- 7. D · F, O, N, C
- 8. A · Zinc is more reactive than iron, so it corrodes instead of the iron
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