1.やさしい
Which of these is a chemical property?
- AColour
- BDensity
- CBoiling point
- DFlammability
2.やさしい
How is percent yield calculated?
- A(Mass of reactants ÷ mass of products) × 100
- B(Actual yield ÷ theoretical yield) × 100
- C(Theoretical yield ÷ actual yield) × 100
- DActual yield − theoretical yield
3.やさしい
How many millilitres are in 1 litre?
- A10
- B10,000
- C1000
- D100
4.ふつう
During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?
- ACombustion
- BCondensation
- CPolymerisation
- DHydrolysis
5.ふつう
A solution has a pH of 10. What is its pOH at 25 °C?
- A4
- B24
- C14
- D10
6.ふつう
What is the oxidation number of oxygen in most of its compounds?
- A−2
- B0
- C−1
- D+2
7.むずかしい
When water boils, what is overcome?
- AThe forces holding the oxygen nucleus together
- BThe covalent O–H bonds inside each molecule
- CHydrogen bonds between water molecules
- DThe ionic bonds between H⁺ and O²⁻
8.むずかしい
化学反応式 __C₃H₈ + __O₂ → __CO₂ + __H₂O を釣り合わせる。O₂ の係数はいくつか。
- A3
- B4
- C10
- D5
解答
- 1. D · Flammability
- 2. B · (Actual yield ÷ theoretical yield) × 100
- 3. C · 1000
- 4. D · Hydrolysis
- 5. A · 4
- 6. A · −2
- 7. C · Hydrogen bonds between water molecules
- 8. D · 5
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