Alloys And Their Properties
Gbogbo ọrọ náà
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.
Ebumnobi
- 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.
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Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Alloys And Their Properties. 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.
- 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
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Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Alloys And Their Properties? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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