1.やさしい
液体から気体への変化を何と呼ぶか。
- A凝固
- B融解
- C凝縮
- D蒸発(気化)
2.やさしい
How is percent yield calculated?
- A(Mass of reactants ÷ mass of products) × 100
- B(Theoretical yield ÷ actual yield) × 100
- C(Actual yield ÷ theoretical yield) × 100
- DActual yield − theoretical yield
3.やさしい
Which method separates sand from water?
- AFiltration
- BDistillation
- CChromatography
- DEvaporation of the sand
4.ふつう
Which substance is a non-electrolyte when dissolved in water?
- AHydrochloric acid
- BGlucose
- CPotassium chloride
- DSodium chloride
5.ふつう
What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?
- A−1
- BIt equals the group number
- C0
- D+1
6.ふつう
When a nucleus emits an alpha particle, how do its mass number and atomic number change?
- AMass number stays the same and atomic number rises by 1
- BMass number falls by 4 and atomic number falls by 2
- CMass number falls by 2 and atomic number falls by 4
- DNeither changes
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。
- AO, F, N, C
- BNa, Mg, Al, Si
- CF, O, N, C
- DC, N, O, F
8.むずかしい
A carboxylic acid reacts with an alcohol in the presence of an acid catalyst. What are the products?
- AAn amino acid and carbon dioxide
- BA salt and hydrogen
- CAn alkane and oxygen
- DAn ester and water
解答
- 1. D · 蒸発(気化)
- 2. C · (Actual yield ÷ theoretical yield) × 100
- 3. A · Filtration
- 4. B · Glucose
- 5. C · 0
- 6. B · Mass number falls by 4 and atomic number falls by 2
- 7. C · F, O, N, C
- 8. D · An ester and water
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