Learning Difficulty of Individual Content Element in Integrated Science(1: Very Easy – 5: Very Difficult).
| Unit | Chapter | Content element | Difficulty level | Average difficulty level | Area |
|---|---|---|---|---|---|
| Ⅰ. Substance and regularity | 1. The regularity and binding of substances | Primordial Elements (Formation) in the Early Universe | 2.29 | 2.45 | Earth science |
| Element Formation in the Solar System | 2.40 | ||||
| Formation of Solid Materials on Earth | 2.49 | ||||
| 2. Constituent substances of nature | Regularity of Geological Features and Biological Components | 2.54 | |||
| Ⅱ. System and interaction | 2. Earth system | Cycling of energy and matter in the Earth system | 2.52 | ||
| Interaction between the Atmosphere and Hydrosphere | 2.45 | ||||
| Ⅰ. Substance and regularity | 1. The regularity and binding of substances | Metals and Nonmetals | 2.44 | 2.61 | Chemistry |
| Valence Electron | 2.64 | ||||
| Ionic Bonding | 2.67 | ||||
| Covalent Bonding | 2.68 | ||||
| 2. Constituent substances of nature | Application of New Materials | 2.68 | 2.97 | Physics | |
| Superconductor | 2.86 | ||||
| Ⅱ. System and interaction | 1. Mechanical system | Gravity | 2.82 | ||
| Free fall | 2.88 | ||||
| Momentum | 3.24 | ||||
| Impulse | 3.35 | ||||
| Ⅰ. Substance and regularity | 2. Constituent substances of nature | Primary Constituents of Living Organisms | 2.54 | 2.62 | Biology |
| Ⅱ. System and interaction | 3. Life system | Function of Cell Membrane | 2.58 | ||
| Cell Organelles | 2.62 | ||||
| Metabolism, Enzymes | 2.66 | ||||
| Genes and Proteins | 2.69 |