Alloys And Their Properties
Akopọ
Pure metals are often too soft or too easily corroded for the jobs we ask of them. So we mix them. An alloy, a metal blended with other elements, can be harder, stronger and more resistant to rusting than the pure metal it came from, which is why brass instruments, stainless-steel cutlery and aircraft bodies are all alloys.
In this lesson you will learn what an alloy is, meet brass and stainless steel and what they are made from, and see why alloys are more useful than pure metals. You will also explain, in terms of structure, exactly why mixing different-sized atoms makes a metal harder and stronger.
Awọn Afojusun
- Describe an alloy as a mixture of a metal with other elements, including: (a) brass as a mixture of copper and zinc (b) stainless steel as a mixture of iron and other elements such as chromium, nickel and carbon.
- State that alloys can be harder and stronger than the pure metals and are more useful.
- Describe the uses of alloys in terms of their physical properties, including stainless steel in cutlery because of its hardness and resistance to rusting.
- Identify representations of alloys from diagrams of structure.
- [Supplement] Explain in terms of structure how alloys can be harder and stronger than the pure metals because the different sized atoms in alloys mean the layers can no longer slide over each other.
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 Alloys And Their Properties. 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.
- What is an alloy? A. a pure metal B. a mixture of a metal with other elements C. a non-metal element D. a compound of two non-metals Answer: B
- Brass is an alloy of: A. iron and carbon B. copper and tin C. copper and zinc D. iron and chromium Answer: C
- Stainless steel resists rusting mainly because it contains: A. carbon B. zinc C. chromium D. tin Answer: C
- Alloys are generally: A. softer than pure metals B. harder and stronger than pure metals C. always liquids D. poor conductors Answer: B
- An alloy is harder than a pure metal because the different-sized atoms: A. make the metal lighter B. stop the layers sliding over each other C. react with each other D. lower the melting point Answer: B
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.
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Alloys And Their Properties? 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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