📚 Common Misconceptions and Corrections in Year 7 AQA Science | Year 7 AQA 科学常见误区与纠正方法
In Year 7 AQA Science, students begin to explore fundamental concepts in biology, chemistry and physics. However, many common misconceptions can hinder their understanding. This article identifies these misconceptions and provides clear corrections to help students build accurate scientific knowledge.
在 Year 7 AQA 科学课程中，学生们开始探索生物学、化学和物理学的基本概念。然而，许多常见的误区会阻碍他们的理解。本文指出这些误区并提供清晰的纠正，帮助学生建立准确的科学知识。
1. All Microorganisms Are Harmful | 所有微生物都有害
Many students think that microorganisms, such as bacteria and viruses, only cause illness. They are often taught about harmful germs in hygiene lessons, leading to the belief that all microorganisms are dangerous.
许多学生认为微生物，如细菌和病毒，只会导致疾病。他们常在卫生课上学到有害病菌，因而相信所有微生物都是危险的。
In reality, most microorganisms are harmless or even essential for life. Bacteria in our intestines help digest food, and decomposers like fungi recycle nutrients in the soil. Some bacteria are used to make yoghurt and cheese.
事实上，大多数微生物是无害的，甚至是生命所必需的。我们肠道中的细菌帮助消化食物，像真菌这样的分解者在土壤中循环养分。有些细菌还被用来制作酸奶和奶酪。
2. Plants Only Respire at Night | 植物只在夜间呼吸
A common error is thinking that plants only carry out respiration when there is no light. Students often confuse respiration with photosynthesis and assume that during the day, plants only photosynthesise and do not respire.
一个常见错误是认为植物只在没有光线时才进行呼吸。学生常常混淆呼吸作用与光合作用，并认为在白天植物只进行光合作用而不呼吸。
Plants respire all the time – both day and night. Respiration releases energy from glucose for growth and cell repair. During daylight, photosynthesis produces glucose and oxygen, but respiration still occurs to keep the plant alive.
植物全天都在呼吸——无论白天还是夜晚。呼吸作用从葡萄糖中释放能量，用于生长和细胞修复。在白天，光合作用产生葡萄糖和氧气，但呼吸作用仍在进行以维持植物生命。
3. Heavier Objects Fall Faster | 重的物体下落更快
Many learners believe that if you drop a heavy object and a light object from the same height, the heavy one will hit the ground first. This idea comes from everyday experiences where air resistance slows lighter objects like feathers.
许多学习者认为，从同一高度同时释放一个重物和一个轻物，重物会先落地。这个想法来自日常经验，空气阻力会减慢羽毛等轻物体的下落速度。
In the absence of air resistance, all objects fall at the same rate regardless of mass. This was demonstrated by Galileo and famously replicated on the Moon, where a hammer and a feather fell together. The acceleration due to gravity is constant, about 10 m/s² on Earth.
在没有空气阻力的情况下，所有物体无论质量大小都以相同的速率下落。伽利略证明了这一点，并在月球上著名地复现了锤子和羽毛一同落下的实验。重力加速度是恒定的，在地球上约为 10 m/s²。
4. Electric Current Is Used Up in a Circuit | 电流在电路中被消耗
Students often think that electric current gets 'used up' as it flows through components like bulbs or motors. They picture current like fuel that is consumed.
学生常常认为电流流经灯泡或电机等元件时会被 "用完"。他们把电流想象成被消耗的燃料。
In a series circuit, the electric current is the same at all points. It is not used up; instead, energy is transferred from the battery to the components, where it is converted into light, heat or motion. The charge carriers (electrons) simply move around the circuit.
在串联电路中，各点的电流都相等。电流并没有被消耗；相反，能量从电池传递给元件，在那里转化为光、热或运动。电荷载流子（电子）只是在电路中循环移动。
5. Mass and Weight Are the Same | 质量与重量是一样的
In everyday language, people use 'weight' to mean mass. This leads to confusion: students often state that their mass is 50 kilograms on Earth and would be the same on the Moon, but they also think their weight remains unchanged.
在日常用语中，人们用 "重量" 来表示质量。这导致混淆：学生常说他们的质量在地球上是50千克，在月球上也会一样，但他们也认为重量保持不变。
Mass is the amount of matter in an object and is measured in kilograms (kg). Weight is the force of gravity on that mass and is measured in newtons (N). Weight depends on the gravitational field strength. The relationship is:
质量是物体所含物质的量，以千克（kg）为单位。重量是作用在该质量上的重力，以牛顿（N）为单位。重量取决于重力场强度。关系式为：
Weight = mass × gravitational field strength (W = m × g)
eighs 500 N. On the Moon, g is about 1.6 N/kg, so the same person would weigh only 80 N, although their mass remains 50 kg.
在地球上，g ≈ 10 N/kg，因此一个50 kg的人重500 N。在月球上，g约为1.6 N/kg，所以同一个人只重80 N，但其质量仍是50 kg。
6. Energy Is a Force | 能量是一种力
Beginners often mix up energy and force, saying phrases like 'the energy pushed the ball'. They treat energy as if it were a tangible push or pull.
初学者经常混淆能量和力，说出 "能量推了球" 这类短语。他们把能量当作一种实际的推或拉。
Energy is the capacity to do work; it is not a force. Forces are pushes or pulls that can cause changes in motion or shape. Energy exists in many forms (kinetic, thermal, light, etc.) and is transferred or converted, while forces act between objects.
能量是做功的能力；它不是一种力。力是推或拉，可以引起运动或形状的改变。能量以多种形式存在（动能、热能、光能等），并被转移或转化，而力是物体之间的相互作用。
7. Particles in a Solid Do Not Move | 固体中的粒子不运动
When learning the particle model, students often picture solid particles as completely still, like bricks in a wall. They believe there is no motion at all.
在学习粒子模型时，学生常将固体粒子想象成完全静止的，像墙上的砖块。他们认为根本没有运动。
In solids, particles are held in fixed positions but vibrate constantly. This vibration is due to thermal energy. Even at room temperature, the particles oscillate around a point. As the solid is heated, the vibrations increase until melting occurs.
在固体中，粒子被固定在某个位置，但会不断地振动。这种振动是由于热能造成的。即使在室温下，粒子也在围绕一个点振荡。当固体受热时，振动加剧，直至熔化。
8. The Sun Orbits the Earth | 太阳绕地球转
From our perspective on Earth, the Sun appears to move across the sky, rising and setting. This daily observation leads some students to believe the Sun travels around the Earth.
从地球的视角看，太阳似乎在空中移动，东升西落。这一日常观察导致一些学生相信太阳绕地球运行。
We now know that the Earth and other planets orbit the Sun – the heliocentric model. The apparent movement of the Sun is caused by the Earth spinning on its axis, which gives us day and night. This was proven by astronomers like Copernicus and Galileo through careful observation.
我们现在知道，地球和其他行星围绕太阳运行——这就是日心说。太阳的视运动是由地球自转造成的，这给了我们昼夜。哥白尼和伽利略等天文学家通过仔细观察证明了这一点。
9. Chemical Changes Are Always Reversible | 化学变化总是可逆的
After learning about melting and freezing, some students think all changes can be reversed. They assume that chemical changes, like baking a cake or burning wood, can be undone by cooling or other simple means.
在学习熔化和凝固之后，一些学生认为所有变化都可以逆转。他们以为化学变化，如烘烤蛋糕或燃烧木材，可以通过冷却或其他简单方法恢复原状。
Physical changes, such as changes of state, are often reversible. However, chemical changes create new substances and are usually difficult or impossible to reverse. Examples include the rusting of iron, combustion, and cooking food. These involve breaking and forming chemical bonds.
物理变化，如状态变化，通常是可逆的。然而，化学变化产生新物质，通常很难或不可能逆转。例子包括铁生锈、燃烧和烹饪食物。这些过程涉及化学键的断裂和形成。
10. All Metals Are Magnetic | 所有金属都有磁性
Because fridge magnets stick to steel, many pupils think every metal is magnetic. They often test coins and are surprised when aluminium or copper is not attracted to a magnet.
由于冰箱贴能吸在钢上，许多学生认为所有金属都有磁性。他们常常测试硬币，当发现铝或铜不被磁铁吸引时感到惊讶。
Only a few metals are magnetic: iron, nickel, cobalt, and some alloys like steel. Most metals, including gold, silver, copper, and aluminium, are not. Magnetism is a property of certain materials, not of all metals.
只有少数金属具有磁性：铁、镍、钴，以及一些合金如钢。大多数金属，包括金、银、铜和铝，都没有磁性。磁性是某些材料的特性，而不是所有金属的。
Published by TutorHao | Science Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图