Alloys And Their Properties
Muhtasari
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.
Malengo
- 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.
Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Alloys And Their Properties. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Alloys And Their Properties? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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