1.やさしい
What is the change from a gas directly to a solid, skipping the liquid state, called?
- ASublimation
- BCondensation
- CFreezing
- DDeposition
2.やさしい
What is an alloy?
- AA compound formed when a metal reacts with oxygen
- BA pure metal in its natural state
- CA nonmetal that conducts electricity
- DA mixture of a metal with one or more other elements
3.やさしい
A cleaning solution has a pH of 12. How is it described?
- AStrongly acidic
- BStrongly basic
- CNeutral
- DWeakly acidic
4.ふつう
温度が高くなると、通常、固体が水に溶ける量はどうなるか。
- Aより多く溶ける
- B固体には影響しない
- Cより少なく溶ける
- D固体が気体になる
5.ふつう
In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ form from 4 mol of KClO₃?
- A6 mol
- B3 mol
- C8 mol
- D4 mol
6.ふつう
Why is a carbon dioxide extinguisher effective on many fires?
- ACO₂ reacts chemically with the fuel to make it non-flammable
- BCO₂ is denser than air and pushes oxygen away from the fire
- CCO₂ is a liquid that soaks into the fuel
- DCO₂ adds oxygen to cool the flames
7.むずかしい
Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵?
- AArgon
- BChlorine
- CFluorine
- DSulfur
8.むずかしい
A mixture contains sand, salt and water. Which sequence separates all three?
- AEvaporate all the water first, then filter the salt away from the dry sand
- BDistil first to remove the sand, then filter out the salt
- CFilter to remove the sand, then distil the filtrate to collect water and leave salt
- DUse a magnet to remove the salt, then filter the sand
解答
- 1. D · Deposition
- 2. D · A mixture of a metal with one or more other elements
- 3. B · Strongly basic
- 4. A · より多く溶ける
- 5. A · 6 mol
- 6. B · CO₂ is denser than air and pushes oxygen away from the fire
- 7. B · Chlorine
- 8. C · Filter to remove the sand, then distil the filtrate to collect water and leave salt
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