1.简单
What kind of carbon–carbon bonds do alkanes contain?
- AAt least one double bond
- BIonic bonds
- COnly single bonds
- DAt least one triple bond
2.简单
According to collision theory, what must happen for particles to react?
- AThey must collide with enough energy and the right orientation
- BThey must both be in the solid state at the same time
- CThey must have the same mass
- DThey must stay completely still next to each other
3.简单
How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?
- A1
- B0.5
- C2
- D3
4.中等
根据分子动理论,温度衡量的是什么?
- A粒子的总数
- B粒子的平均动能
- C容器的大小
- D每个粒子的质量
5.中等
Potassium forms K⁺ ions and sulfur forms S²⁻ ions. What is the name and formula of their compound?
- APotassium sulfite, KS
- BPotassium sulfide, K₂S
- CPotassium sulfide, KS₂
- DPotassium sulfate, K₂SO₄
6.中等
Which element has the most metallic character?
- AChlorine (Cl)
- BSodium (Na)
- CCaesium (Cs)
- DAluminium (Al)
7.困难
What is (8 × 10⁶) ÷ (2 × 10⁻²)?
- A16 × 10⁴
- B4 × 10⁴
- C4 × 10⁸
- D4 × 10⁻¹²
8.困难
将 2 mol H₂ 和 2 mol O₂ 混合,按 2H₂ + O₂ → 2H₂O 反应。哪种反应物是限量试剂?
- A氧气,因为氧气比氢气少
- B水,因为它是产物
- C氢气,因为 2 mol H₂ 只用掉 1 mol O₂
- D都不是,因为量相等
答案
- 1. C · Only single bonds
- 2. A · They must collide with enough energy and the right orientation
- 3. C · 2
- 4. B · 粒子的平均动能
- 5. B · Potassium sulfide, K₂S
- 6. C · Caesium (Cs)
- 7. C · 4 × 10⁸
- 8. C · 氢气,因为 2 mol H₂ 只用掉 1 mol O₂
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