The Mole Concept
Gbogbo ọrọ náà
A balance in a school laboratory can tell you that a strip of magnesium weighs 0.1 g. What it cannot tell you, and what a chemist actually wants to know, is that the strip holds roughly two and a half thousand billion billion atoms. Chemical equations are written in particles: two of these react with one of those. Balances are built to read grams. Somewhere between those two facts there has to be a translator, and the mole is it.
This lesson introduces the one unit that lets a laboratory balance behave as a counting machine. You will meet the number that every mole contains, find out why that particular number and no other was chosen, and learn to move in both directions between a mass in grams and an amount in moles. By the end you will be able to look at 9.0 g of water and 22 g of carbon dioxide and say, without hesitation, that the two samples contain exactly the same number of molecules, and you will know why a real examination question asks a student to weigh out 0.050 mol of a metal rather than 3 g of it.
Ebumnobi
- The relative formula mass of a substance, in grams, is known as one mole of that substance. Students should be able to use the relative formula mass of a substance to calculate the number of moles in a given mass of that substance and vice versa.
- One mole contains 6.02 × 1023 atoms or molecules. This number is known as Avogadro’s constant.
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E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na The Mole Concept. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- One mole of any substance contains the same number of particles. What is this number? A. 6.02 x 10^22 B. 6.02 x 10^23 C. 6.02 x 10^24 D. 1.00 x 10^23 Answer: B
- The relative formula mass of calcium carbonate, CaCO3, is 100. What is the mass of 0.20 moles of calcium carbonate? A. 5 g B. 20 g C. 50 g D. 500 g Answer: B
- A sample of sodium has a mass of 4.6 g. The relative atomic mass of sodium is 23. How many moles of sodium atoms are in the sample? A. 0.20 mol B. 0.50 mol C. 2.0 mol D. 5.0 mol Answer: A
- 0.25 moles of a compound has a mass of 10 g. What is the relative formula mass of the compound? A. 2.5 B. 10 C. 40 D. 250 Answer: C
- A student needs 0.050 mol of zinc. The relative atomic mass of zinc is 65. What mass of zinc should be weighed out? A. 1.3 g B. 3.25 g C. 13 g D. 1300 g Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara The Mole Concept? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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