1.简单
现代元素周期表中,元素是如何排列的?
- A按原子序数递增
- B按中子数递增
- C按发现的日期
- D按元素符号的字母顺序
2.简单
What is a horizontal row of the periodic table called?
- AA family
- BA period
- CA block
- DA group
3.简单
How is percent yield calculated?
- A(Actual yield ÷ theoretical yield) × 100
- BActual yield − theoretical yield
- C(Mass of reactants ÷ mass of products) × 100
- D(Theoretical yield ÷ actual yield) × 100
4.中等
Which coefficients balance __KClO₃ → __KCl + __O₂?
- A2, 1, 3
- B2, 2, 3
- C1, 1, 3
- D1, 1, 1
5.中等
哪种元素的电负性最大?
- A氦
- B氟
- C钠
- D铁
6.中等
Which nuclear process powers the Sun?
- AAlpha decay of helium
- BCombustion of hydrogen gas with oxygen in its core
- CFission of uranium into smaller nuclei
- DFusion of hydrogen nuclei to form helium
7.困难
What is the formula of iron(III) chloride?
- AFeCl₃
- BFe₂Cl₃
- CFe₃Cl
- DFeCl₂
8.困难
一段铜线中是哪种成键方式?
- A只在两个原子之间共用电子对的共价键
- B铜原子之间的氢键
- C铜与氯离子之间的离子键
- D金属键:离子沉浸在电子海中
答案
- 1. A · 按原子序数递增
- 2. B · A period
- 3. A · (Actual yield ÷ theoretical yield) × 100
- 4. B · 2, 2, 3
- 5. B · 氟
- 6. D · Fusion of hydrogen nuclei to form helium
- 7. A · FeCl₃
- 8. D · 金属键:离子沉浸在电子海中
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