Elements, Compounds And Mixtures
Akopọ
Everything around you - the air you breathe, the water you drink, the screen you are reading - is made from just over a hundred different elements. Sometimes those elements exist on their own, sometimes they are chemically bonded into compounds, and sometimes they are simply mixed together without reacting.
In this lesson you will learn to classify substances as elements, compounds, or mixtures, understand how purity is defined in chemistry, and master the separation techniques that chemists use to pull mixtures apart.
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 experimental techniques for the separation of mixtures: simple distillation, fractional distillation, filtration, crystallisation and 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
- Investigate paper chromatography using inks/food colourings
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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) Oxygen gas (O2) B) Iron filings C) Carbon dioxide (CO2) D) Air Answer: C
- A pure substance can be identified because it: A) Dissolves in water B) Has a fixed melting point C) Is always a solid D) Melts over a range of temperatures Answer: B
- Which technique separates an insoluble solid from a liquid? A) Distillation B) Chromatography C) Filtration D) Crystallisation Answer: C
- In chromatography, the Rf value is calculated by dividing: A) Distance moved by solvent by distance moved by substance B) Distance moved by substance by distance moved by solvent front C) Mass of substance by mass of solvent D) Time taken by substance by time taken by solvent Answer: B
- Fractional distillation is used to separate: A) An insoluble solid from a liquid B) A dissolved solid from a solution C) Miscible liquids with different boiling points D) Immiscible liquids Answer: C
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Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
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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Abala ìwé ẹ̀kọ́
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
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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.
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