Alloys And Their Properties
Bayani Gaba-gaba
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.
Manufura
- [Core] Describe alloys as mixtures 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
- [Core] State that alloys can be harder and stronger than the pure metals and are more useful
- [Core] Describe the use of alloys in terms of their physical properties, including stainless steel in cutlery because of its hardness and resistance to rusting
- [Core] 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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Barka da kammala darasi akan Alloys And Their Properties. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
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- 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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