Elements, Compounds And Mixtures
Gbogbo ọrọ náà
Look around any kitchen and you will find elements (the copper in wiring), compounds (the sodium chloride in your salt shaker) and mixtures (the air you breathe). Telling them apart, and separating mixtures into their components, is one of the oldest skills in chemistry.
In this lesson you will learn the definitions that distinguish elements, compounds and mixtures, explore how melting-point data reveals purity, and master five separation techniques that Edexcel tests regularly: distillation, fractional distillation, filtration, crystallisation and paper chromatography.
Ebumnobi
- understand how to classify a substance as an element, compound or mixture
- understand that a pure substance has a fixed melting and boiling point, but that a mixture may melt or boil over a range of temperatures
- describe these experimental techniques for the separation of mixtures: - simple distillation - fractional distillation - filtration - crystallisation - paper chromatography.
- understand how a chromatogram provides information about the composition of a mixture
- understand how to use the calculation of Rf values to identify the components of a mixture
- practical: investigate paper chromatography using inks/food colourings
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
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 Elements, Compounds And Mixtures. 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.
- Which of the following is a compound? A) Nitrogen gas (N2) B) Bronze C) Water (H2O) D) Air Answer: C
- A pure substance can be identified because it: A) Is colourless B) Has a sharp, fixed melting point C) Dissolves in water D) Cannot be filtered Answer: B
- Which separation technique would you use to obtain pure water from salt water? A) Filtration B) Crystallisation C) Simple distillation D) Paper chromatography Answer: C
- In paper chromatography, what is the mobile phase? A) The pencil line B) The paper C) The solvent D) The spots Answer: C
- An Rf value of 0.75 means the substance has travelled: A) 75% of the distance to the solvent front B) 75% of the total paper length C) 25% of the distance to the solvent front D) Three quarters of the way to the top of the paper Answer: A
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
Phases and Classification of Matter
Describe the basic properties of each physical state of matter: solid, liquid, and gas
"Chemistry: Phases and Classification of Matter" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/1-2-phases-and-classification-of-matter. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Akụkụ akwụkwọ
Colligative Properties
Express concentrations of solution components using mole fraction and molality
"Chemistry: Colligative Properties" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/11-4-colligative-properties. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Elements, Compounds And Mixtures? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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