Elements, Compounds And Mixtures
Akopọ
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.
Awọn Afojusun
- 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
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Elements, Compounds And Mixtures. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Elements, Compounds And Mixtures? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
Ṣe igbasilẹ ohun elo naa lori Google Playstore
Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
