其中之一property : there are empty spaces between particles.

若如此, 又如何解釋 smaller particles pass through bigger particles

例如 : 當水和酒精混合, water particles 走進了 alcohol particles , 從而令到volume 沒改變.

謝謝.

the spaces between particles is not fixed.

Try thinking “sand and water”

Can this help

The Five points of Particle Theory are:

1)All Matter is made up of tiny particles, invisible to the naked eye

2)All particles in a pure substance are the same. Different substances are made up of different particles

3)Particles have spaces between them, regardless of size.

4)Particles move faster and spread more when heated

5)The particles in a substance are attracted to eachother. The strength of the attractive force depends on the particle.

5)The particles in a substance are attracted to each other. The strength of the attractive force depends on the particle.
If a particle is negative, it will attract a positive particle and they will stay close together, rather than apart, unlike a positive vs positive, and negative vs negative. This concept is like one of a magnet, positive attracts negative, negative attracts positive.

Particles have space between them, regardless of size. E.i: In a solid, all of the particles still have space between them, but they are much smaller than gasses' particle's spaces. In a liquid, the spaces between the particles are bigger than a solid's, but much smaller than a gasse's. Particles are always vibrating against each other. Even though you cannot see or feel any of this, it still does happen. (ask me questions, I'll explain)

The Particle Theory
Particles move faster (vibrate faster) and spread out more because the heat transmits more energy into them, causing the particles to vibrate more rapidly. For example, it's just like when you step on a very hot pavement in your bare feet. That makes you move a lot faster.

A pure substance is a substance in which all of the particles in it are of the same making it homogeneous, while A heterogeneous mixture is a mixture of pure substances and other heterogeneous mixtures that come to mix many different particles around, not allowing it to be a pure substance. All particles in a pure substance are the same. Different substance different particles. A way to explain this would be: You have a mixed fruit cup, and a glass of distilled water, which one do you think is more 'Pure'?

Same particles   Mixed particles

3)Particles have space between them, regardless of size.
4) particles move faster and spread out more when heated.

我就係睇唔明 particle theory 既講 empty spaces between particles,

但又講 : particles moves all directions randomly , 及實驗証明smaller particle go through bigger particles.

若 no spaces between particles, particles 不是不能 move 嗎 ?

水流過沙, 不是因為沙particles 之間有space 嗎?

#5, 你的Point 3 說有 spaces

教科書上寫: there are empty spaces between particles.

我應理解錯這句英文. empty spaces 不等同 no spaces.

但是, 教科書說: smaller particles pass through bigger particles, 原因應不是二者的size大小不同吧.

應是smaller particles 能 pass through the spaces between bigger particles , 是嗎?

咁 bigger particles 係咪都可以 pass through the space between smaller particles 呢? 因既然所有particles are moving , 及 space between partices 非固定.

另問, space 到底應否加 s ? 我見教科書上有, 但網上有些講particle theory 又沒加 s


最後修改時間: 2021-05-16 09:38:04

#1

First of all, 有兩樣fundamental mistakes:

1) particle在particle theory context 下通常指 fundamental particles 中學會話係呢D: proton, electron....
Water molecules係指H2O, 兩粒hydrogen atoms+ 1粒 oxygen atom. 中學會話particle binding.

2) 酒精加水會有volume contraction,要計數先搵到final volume,或者用alcoholmeter 去度 final concentration.



最後修改時間: 2021-05-16 10:26:16

香港書累死人！表達不清不楚！可能是強國英文！

外國大學用的清楚丶細節好多！

Feel sorry for you and most HK parents!

朋友多年前在 St. Paul’s coed, 考 數學題丶 教師look for one single answer(普通學生只可能有一答案）, 但用大學角度 或資優丶think out of the box丶有多個可能丶因個問題未有 well define!!!

#9

我唔滿意香港教育其中一樣就係"model answer"或只有一個答案.我估咁樣影響到香港好多forums嘅人問問題時會不斷問,問到"一個答案"出來.
做了幾十年人都知道一個難題可能有多種答案或解決方法

This particular book, “too simply and.......”......江主席名句

題外話丶三歳多孫在澳洲家看海及沙灘丶突然一問＂為什麼海水的水連在一起＂而沙是粒粒！！
他當時不像香港小朋友丶什麼字也不識丶腦不用死記丶才＂生＂才＂活＂

最後修改時間: 2021-05-16 10:49:20

#9 如果無model answer啲老師改卷咪要改好耐又會隨時畀學生challenge 所得分數，香港制度一分out of 100分都要打崩頭，所以model and wry係完全配合香港社會思維：最緊要快靚正。
阿仔讀IB國際學校，上小學時學校好強調數係唔會操嘅，目的係要教出mathematicians ，小學教數主要係教從唔同嘅角度去思考，思考process重要過答案，心算一定唔叻，依家初中都係一樣，功課做完自己對答案，唔啱就要自己搵點解，佢地嘅進度一定無本地學校快同深，但啲學生一樣入到頂尖大學

＃12 x n

其實在 #9 所講的朋友是我弟弟丶現已是博士了丶奇人一個丶MD 加 computer Sc, 再 PhD

小弟cousin 在 St. Paul’s 被＂請出校＂丶他當時太悶丶學校太慢丶搞事丶原來是超級資憂丶去到外國丶四學位丶幾十年前 PhD artificial intelligence、入 citi 投資分析......

我當年教兒子及現時的孫丶是教 numerical system, properties of + - x /........, , 兒子外國master 後入了最大投行,現 外國某大bank head office chief investment officer

兒子當時中學數 差過香港同級好多

最後修改時間: 2021-05-16 11:24:02

Co-ed 成間學校啲人望落去都好似戇戇居居咁

我以前中學響佢隔離，從來冇聽過有任何同學會 "目及" 佢哋啲女，淨係聽到啲同學話覺得佢地啲女個個都好似阿嬋。

傳統名校大部份都係死讀書，咁多間我只係覺得女拔嘅教學同埋考試方式會比較「活」同埋真係會啟發思考。

＃14， 你在 St joe?

係

#13 香港教制度係只會recognize 高分數嘅資優學生，唔會明白all kids are different ，只會用一個模套在所有學生，out of ordinary 嘅就唔會包容理解。香港學生最緊要係識點樣應付考試攞高分，親身經歷就係中學自己數學物理都算「叻」，响加拿大讀咗一年high school，比加拿大中學生高起碼一班，但係入到大學先發覺真係叻喎啲都係鬼仔鬼妹，因為佢地諗野方法唔似香港學生，好多時我哋完全無idea佢哋都solve到，「我哋」係一班數比較叻嘅香港學生，物理就更加唔使講。

最後修改時間: 2021-05-16 11:35:34

＞＞＞若 no spaces between particles, particles 不是不能 move 嗎 ?

簡單答丶Yes, but under infinite pressure

最後修改時間: 2021-05-16 11:45:20

＞＞＞但是, 教科書說: smaller particles pass through bigger particles, 原因應不是二者的size大小不同吧.

應是smaller particles 能 pass through the spaces between bigger particles , 是嗎?

...................

小朋友角度丶將沙放入水丶沙經水落到底

反之先放沙丶水又會經沙落

留意不同壓力下丶反應不同

如水

What happens to water under high pressures without the possibility of escape? You can see that at high-pressure water assumes a solid form (ice): you will have ice X at 100 GPa, and what is labelled as hexagonal ice XI in the diagram but is actually superionic water or ice XVIII at 1 TPa (temperature range 0 to 650 K).

這就很難過！

最後修改時間: 2021-05-16 12:12:44

＞＞＞若 no spaces between particles, particles 不是不能 move 嗎 ?

不同溫度丶movement 不同丶或停止