Core Knowledge Review for Year 11 CAIE Science | Year 11 CAIE 科学核心知识点梳理

📚 Core Knowledge Review for Year 11 CAIE Science | Year 11 CAIE 科学核心知识点梳理

The Year 11 CAIE Science curriculum, whether you are following Combined Science or Co-ordinated Sciences, builds on the foundations laid in earlier years and deepens your understanding of Biology, Chemistry, and Physics. This article aims to consolidate the essential topics, highlight key definitions, and provide clear bilingual explanations to help you achieve success in your examinations.

Year 11 CAIE 科学课程，无论是综合科学还是联合科学，都是在以前学习的基础上加深对生物、化学和物理的理解。本文旨在梳理核心知识点，强调关键定义，并提供清晰的双语解释，帮助你顺利应对考试。

1. Cell Structure and Function | 细胞结构与功能

All living organisms are composed of cells, which are the basic structural and functional units of life. Cells can be classified as prokaryotic (without a true nucleus) or eukaryotic (with a membrane-bound nucleus).

所有生物都由细胞构成，细胞是生命的基本结构和功能单位。细胞可分为原核细胞（无核膜包被的细胞核）和真核细胞（有核膜包被的细胞核）。

Animal cells typically contain a nucleus, cytoplasm, cell membrane, mitochondria, and ribosomes. Plant cells have these organelles as well as a rigid cell wall, chloroplasts for photosynthesis, and a large permanent vacuole.

动物细胞通常含有细胞核、细胞质、细胞膜、线粒体和核糖体。植物细胞则还有坚硬的细胞壁、用于光合作用的叶绿体以及一个大的中央液泡。

The cell membrane is selectively permeable and controls the movement of substances in and out of the cell. Diffusion is the net movement of particles from an area of high concentration to an area of low concentration, down a concentration gradient, while osmosis is the diffusion of water molecules through a partially permeable membrane.

细胞膜具有选择透过性，控制物质进出细胞。扩散是指粒子从高浓度区域向低浓度区域沿浓度梯度的净运动，而渗透是水分子通过半透膜的扩散。

2. Enzymes and Nutrition | 酶与营养

Enzymes are biological catalysts made of protein that speed up chemical reactions in living organisms without being used up. Each enzyme has an active site with a specific shape that fits its substrate like a lock and key.

酶是由蛋白质构成的生物催化剂，能加速生物体内的化学反应而自身不被消耗。每种酶都有一个活性位点，其特定形状与底物相匹配，如同锁和钥匙。

Enzyme activity is affected by temperature and pH. As temperature increases, the rate of reaction increases until an optimum temperature is reached; beyond this, the enzyme denatures and loses its shape permanently. Similarly, each enzyme works best at a specific pH.

酶的活性受温度和pH影响。温度升高时，反应速率加快，直至达到最适温度；超过此温度，酶会变性并永久失去活性。同样，每种酶都有其最适pH。

The major digestive enzymes include amylase (breaks down starch into maltose), protease (breaks down proteins into amino acids), and lipase (breaks down lipids into fatty acids and glycerol). These enzymes are produced in glands and released into the alimentary canal.

主要的消化酶包括淀粉酶（将淀粉分解为麦芽糖）、蛋白酶（将蛋白质分解为氨基酸）和脂肪酶（将脂类分解为脂肪酸和甘油）。这些酶由腺体产生并释放到消化道中。

3. Atomic Structure and Chemical Bonding | 原子结构与化学键

Atoms consist of a central nucleus containing protons and neutrons, surrounded by electrons arranged in shells. The number of protons (atomic number) determines the element, while the mass number is the total number of protons and neutrons.

原子由一个包含质子和中子的原子核以及核外分层排布的电子组成。质子数（原子序数）决定了元素的种类，而质量数是质子数和中子数的总和。

Electrons occupy specific energy levels or shells: the first shell holds up to 2 electrons, and the second and third shells can hold up to 8 electrons each (for the purposes of IGCSE). Atoms are most stable when they have a full outer shell, which they achieve by forming chemical bonds.

电子占据特定的能级或电子层：第一层最多容纳2个电子，第二层和第三层最多可容纳8个电子（就IGCSE要求而言）。原子最外层电子排满时最稳定，它们通过形成化学键来实现这一稳定结构。

Ionic bonding occurs between metals and non-metals, where electrons are transferred from the metal to the non-metal, forming positive and negative ions that attract each other. Covalent bonding occurs between non-metal atoms, which share pairs of electrons to achieve full outer shells.

离子键形成于金属和非金属之间，金属将电子转移给非金属，形成正离子和负离子，两者相互吸引。共价键形成于非金属原子之间，它们通过共享电子对来达到满壳层结构。

4. Rate of Reaction and Reversible Reactions | 化学反应速率与可逆反应

The rate of a reaction can be measured by the amount of product formed or reactant used up per unit time. Factors affecting the rate include concentration, temperature, surface area, and the presence of a catalyst. According to collision theory, reactions occur when particles collide with sufficient energy (activation energy) and correct orientation.

反应速率可以通过单位时间内生成物的产量或反应物的消耗量来衡量。影响速率的因素包括浓度、温度、表面积和催化剂的存在。根据碰撞理论，反应只有在粒子以足够的能量（活化能）和正确的取向碰撞时才会发生。

Increasing the temperature increases the kinetic energy of particles, causing more frequent and more energetic collisions, and

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