Materials
Respiration
Chromatography
Forces
Random
100
What is the smallest part of an element called?
元素最小的部分叫什么？
Atom
100
Which organ helps us breathe?
哪个器官帮助我们呼吸？
Lungs
100
What do we call a solid that disappears in water?
在水中“消失”的固体叫什么？
Dissolving
100
What force pulls objects to Earth?
什么力把物体拉向地球？
Gravity
100
Which planet do we live on?
我们生活在哪个星球上？
Earth
200
Name the three states of matter.
说出物质的三种状态。
Solid, liquid, gas
200
What gas do humans breathe in?
人类吸入什么气体？
Oxygen
200
What is the liquid in a solution called?
溶液中的液体叫什么？
Solvent
200
What type of force is gravity?
重力属于哪一种力？
An invisible pulling force
200
What is the boiling point of water?
水的沸点是多少？
100°C
300
What happens to particles when a solid melts?
当固体融化时，粒子会发生什么变化？
They move more and spread out
300
What gas do humans breathe out?
人类呼出什么气体？
Carbon dioxide
300
What is chromatography used for?
色谱法是用来做什么的？
To separate colours or substances
300
What force slows down a moving object?
什么力会减慢运动中的物体？
Friction
300
How do plants produce energy?
植物如何产生能量？
By photosynthesis using sunlight
400
Which material lets electricity pass through it?
哪种材料可以导电?
Metal
400
Why do we need respiration?
为什么我们需要呼吸作用？
To release energy from food
400
Why do different colours move different distances in chromatography?
为什么不同颜色在色谱中移动的距离不同？
They dissolve and move at different speeds
400
What happens if forces are balanced?
如果力是平衡的，会发生什么？
No change in movement
400
Name one renewable energy source.
说出一种可再生能源。
Solar / wind / hydro / wave / geothermal
500
Why is oxygen an element but water a compound?
为什么氧气是元素，而水是化合物？
500
What is the difference between breathing and respiration?
呼吸和呼吸作用有什么不同？
Breathing = moving air in and out
Respiration = releasing energy in cells
500
What is the difference between soluble and insoluble?
可溶和不溶有什么区别？
Soluble dissolves, insoluble does not
500
Why does a parachute slow a person down?
为什么降落伞会让人慢下来？
Air resistance
500
Why does ice float on water?
为什么冰会浮在水面上？
Ice is less dense than water