1. water doesn’t really have a shape, it depends on what’s around it, the container
2. when you sweat you loose the water from your muscles and begin to cramp, they don’t work as well
3. if you’re running you’re not loosing water, you’re loosing grease
4. the subatomic atoms, when water begins to freeze, the atoms start to change their shape, they keep the circle, but when they get hard, and then they change shape, it’s like a spear with triangles sticking out, and when it becomes a gas, it just becomes lighter, it doesn’t change shape
5. every thing growing needs water
If pour cold water into hot water, what will happen?
6. the cold water is heavier, or maybe it’s the opposite, one of the will go under, so there will be two different layers, the temperature makes one of them heavier, the cold water is heavier, something happens to the atoms
7. it depends on the temperature, the hot water will be less
why does ice float?
8. when things get frozen the molecules get bigger, it’s still the same weight, but because it gets bigger it’s more spread apart, so it’s lighter, only when water becomes ice, then the molecules gets large, that’s why when you take a water bottle and freeze it it might pop
9. atoms are mostly air, so I think it has something to do with, the middle of the atom, and sub-atomic particles going around the atom, the ones going around the middle of the atom, because of the temperature, they would probably not be able to go around the atoms, and so it would become hard like ice
10. (to clean water) you can freeze it, so the particles and living things die, then we can filter it, to take away all the dirt in it
11. I don’t think you sweat in water, even in hot water, your sweat would become hot too, if you’ve covered with water, you’re body wouldn’t do that, it’s impractical
12. since there are gases in water, they are also made up of molecules
13. if you don’t drink water, you’ll lose all of your blood, you need water to run the blood through your veins, blood is also made up of water
14. H is hydrogen, O is oxygen, and the 2 makes the water drinkable, because it would be dangerous because it’s explosive
15. the voice box needs water to produce sound
16. if you don’t have water on your body, you body will have a hard time functioning, you’ll be skinny, and you can die
17. the earth is made out of 75% water
18. when water becomes ice the particles freeze
19. when we’re running, your body gets tired, because there’s not a lot of water, we loose a lot of water, and when we drink and our body begins to work
20. if water never existed it would be hard to eat because much of the food nowadays is full of water, like carrots; water is used to make food; if we cook we have to use water
21. water goes in your veins, and moves blood smoothly, if not the blood will stay in one place, and if you don’t drink water for a day and a half you’ll die
22. water is made by thousands of microscopic organisms
23. water is made by forms of gases put together; the H is hydrogen, there’s oxide for the O, and there’s two, I’m not sure what that is, I think it’s either hydrogen twice, or oxide twice, but I’m not sure
24. when you drink water it’s sort of a way to make you feel more refreshed, and if you’re kind of just dry your organs or something can start going wrong
25. if he is used to the water (that he drinks) his body can easily protect him from sicknesses, but if I were to drink it the amount of organisms that are bad for me would be really bad, and my body wouldn’t be able to fight it, and I would get sick
26. here there is a lot of garbage around, so if it were to come from really far away mountains, because I don’t see any mountains that have snow, I don’t even know where it comes from here, but it would go through these tubes, but here I don’t think they clean it very often
27. I think that when the water comes to the tap, inside the tap there are germs everywhere, so when water comes to the tap it changes color
28. about 75% of the Earth is water, I think, so that makes water very essential, very important
29. when you go to a different country the water tastes different. Why?
30. I heard that there are two kinds of water: water that you can drink and water that you can’t drink. The water that you can’t drink is like the water from the sea
31. when you come to a new place the water is different and I think your blood cells are not used to it and after some time they find a way to stop this different thing in the water
32. when you taste different waters, it could be from the source, if you leave it in the bottle a lot, like plastic, sometimes it’s not good to drink, but you could be used to the taste of it, from a plastic bottle
33. the ice forms is when the molecules all get blocked together, they come together and freeze. (When we heat the ice) they come out, and they’re free then, because they have space, yeah, they come apart, because the heat makes them free, it melts and spreads out, and the molecules have more space
34. every time it changes state, from solid to liquid to gas, it wears out, some things get left behind
35. we can only drink one type of water, we can’t drink saltwater, or frozen water
36. I heard that it expanses, so when it changes to ice, it’s more than water
37. I’m not sure why it goes up (water vapor)
38. the hydrogen and oxide, when they come together, it’s pressure, there’s the pressure, when it hardens to ice it’s the pressure comes together and it expands, it doesn’t decrease, the pressure makes it expand, and it makes it hard, bigger not smaller
at what temperature does water boil?
39. 50 degrees C . . . 100 degrees C . . . 75 degrees C . . . 60 . . . 255 degrees Fahrenheit
what does boil mean?
40. to make it hot
41. it can be just 50 percent, like in the middle for normal
42. it makes zero for ice and 100 for boil
43. it’s kinda like . . . I’m not sure
44. it starts to steam a lot, and the water is less, the molecules feel light and evaporate
45. the heat makes the water to evaporate
46. the molecules as a gas get smaller, so they’re lighter
47. boil means when things get bubbly
48. the molecules get smaller, and just forms a bubble and pops
What is a molecule?
49. it’s like a little bubble
50. it’s when the water starts to shake, the fire’s so hot, the air can’t take it any more and it starts to shake, the air in the water’s hot, and it transforms into a bubble and pops
51. I think the water evaporates and is attracted to the cold surface (like the underside of a pot lid)
52. cold water will go down, it’s kinda heavier because it’s cold, the cold water it’s a bit together, it’s a bit squished, not a lot, then it goes down
53. when you boil water it splits into tiny pieces, into gas, and it gets smaller and smaller, and weighs less, it evaporates, then the water starts getting smaller and smaller at the top, then it goes down because it’s lighter, hot water will go down and cold water will come up
I followed up with clarifying questions, and probes aimed at determining the depth of their understanding (or the lack thereof). Most students had had little exposure to atomic theory (atoms & molecules) or heat transfer in their schooling.
Following this survey, I asked: what questions do you have about water that you'd like to answer over the course of this unit? Students wondered . . .
How do we separate water, the particles, hydrogen from oxygen?
How can we see the molecules in the water?
What really is water?
Why can’t we breathe under water like fish?
How do bubbles end up in the middle of an ice cube?
How do they make water, and what are the things they put in there?
At the beginning, where did water come from?
What is density? What makes something dense?
How do we clean water?
What do they put in the water, because in different countries the water tastes different?
Is our solar system formed like a molecule?
Why do we need water?