儿童
初二科学练习题
初中二年级（8年级） · 中国
- 13–14 岁
- 初中
为中国初二准备的免费科学学习单，适合 13 至 14 岁的孩子。 这一年孩子通常会练习化学元素与符号（第2级）、物理计算：速度、力和能量（第2级）、国际单位与符号（第2级）和人体与细胞（第2级）。
把每份学习单和真实的事物联系起来：洗澡时说出身体部位的名称，看看天空，聊聊天气。 初中阶段，坚持练好基础，才能为更难的内容做好准备。
下面的每份学习单都由我们的生成器全新制作：可以连同答案一起打印，可以在屏幕上玩并即时批改，也可以一键做出新版本。
孩子在初二科学中要练习什么
课程标准关联
- Common Core HSN-Q.A.1: Use units to understand problems and to guide multi-step solutions; choose and interpret units in formulas.
- England NC KS3.SC.BI.1: Cells as the basic unit of life: functions of the cell wall, membrane, cytoplasm, nucleus, vacuole, mitochondria and chloroplasts.
- England NC KS3.SC.BI.3: Photosynthesis: its reactants and products, a word summary, and why almost all life depends on it.
- England NC KS3.SC.CH.1: The Periodic Table: elements and their symbols, metals and non-metals, and how the table is arranged.
- England NC KS3.SC.PH.1: Speed and the relationship between average speed, distance and time (speed = distance ÷ time).
- England NC KS3.SC.PH.2: Forces: weight as mass × gravitational field strength, and forces changing motion.
- England NC KS3.SC.PH.3: Electricity: current, potential difference and resistance in circuits, measured in amps, volts and ohms.
- England NC KS3.SC.PH.4: Energy: power ratings of appliances, energy in kilowatt-hours and the cost of energy use.
- England NC KS3.SC.WS.1: Understand and use SI units and IUPAC chemical names.
- BNCC EF06CI05: Explain the basic organisation of cells as the structural and functional unit of living things.
- BNCC EF09CI03: Identify models of the structure of matter (atoms and simple molecules) and how they developed.
- NGSS MS-PS1-1: Develop models of the atomic make-up of simple molecules and extended structures.
- NGSS MS-PS2-2: Investigate how a change in an object's motion depends on the total force on it and its mass.
- NGSS MS-LS1-1: Gather evidence that living things are made of cells, either one cell or many.
- NGSS MS-LS1-2: Model the function of a cell as a whole and how its parts contribute to it.
- NGSS MS-LS1-6: Explain the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.
- NGSS MS-ESS1-2: Model the role of gravity in the motions within galaxies and the solar system.
- NGSS HS-PS2-1: Analyse data supporting Newton's second law: net force, mass and acceleration (F = ma).
- Programmes FR C4.PC.MA.1: Describe matter as atoms and elements, and use their chemical symbols and the periodic table.
- Programmes FR C4.PC.MO.1: Describe a motion and calculate a speed (v = d / t).
- Programmes FR C4.PC.MO.2: Tell weight and mass apart and use P = m × g.
- Programmes FR C4.PC.EN.1: Use the laws of electricity (Ohm's law), power and energy (E = P × t).
- Programmes FR C4.SV.VI.1: Relate the cell to the organisation of living things, from cells to organs.
- Programmes FR C4.SV.VI.2: Explain how plants make their own food (photosynthesis) and how organisms get energy (respiration).
初二现成的科学学习单
初二的其他学科
家长和老师常问的问题
这些学习单是免费的吗？
是的。这个页面上的每项活动都可以免费打印和在屏幕上玩，无需注册。资源库中少数标有“高级版”的内容属于付费方案。
我可以打印吗？
可以。每份学习单都能在 A4 或美国 Letter 纸上清晰打印。点击“打印”，然后使用浏览器的打印窗口，或将其另存为 PDF。
包含答案吗？
数学、阅读和谜题学习单都有：可以连同学习单一起打印答案，也可以在屏幕上玩，立即批改。
初二的学习单遵循哪种课程？
它们遵循中国初二通常教授的技能。每项活动都与该学年的典型年龄相匹配，因此适合大多数学校的教学安排。
初二是多大年龄？
在中国，初二通常适合 13 至 14 岁的孩子。如果孩子需要更多练习或更大的挑战，可以使用前后年级的页面。
我可以自己做一个版本吗？
可以。在任何活动上点击“做一份新的”，就能在学习单制作器中打开它。你可以更改难度、题目数量或主题，想打印多少个不同的版本都可以。