Questions and Answers
What distinguishes noble metals from other metals?
Noble metals, like gold and platinum, are less reactive and can be found in their native state.
What is the definition of an ore?
An ore is a rock from which a metal can be profitably extracted due to its high metal content.
List two properties of metals.
Metals are good conductors of heat and electricity, and they are malleable.
What is meant by a metal's 'native state'?
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Why are metals important resources on Earth?
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How do non-metals differ from metals in terms of properties?
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What can be said about the reactivity of noble metals?
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Give an example of a noble metal and its common use.
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What are the common forms in which highly reactive metals like calcium and sodium are found?
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Define metallurgy in simple terms.
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Why are metals considered vital for the development of a country?
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What does the reactivity series of metals indicate?
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List the top three metals in the reactivity series.
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Which metal is at the bottom of the reactivity series?
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Name an example of a metal and its oxide mentioned in the content.
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How has the use of metals evolved with advancements in science and technology?
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Study Notes
Learning Objectives
- Understand properties of metals and non-metals.
- Explore uses of metals and non-metals.
- Learn about the corrosion of metals.
Metals
- Comprise over 75% of the known 118 elements.
- Most metals occur as compounds or mixtures, not in a free state.
- Noble metals like gold, silver, and platinum exist in their native state and are resistant to reactivity.
- Minerals are natural chemical substances found in the earth's crust, which may contain pure metals along with impurities.
- Ores are rock deposits containing sufficient amounts of metal that are economically viable for extraction.
Classification of Metals
- Highly reactive metals (e.g., calcium, sodium) primarily found as chlorides and carbonates.
- Metals like aluminum, iron, copper, and zinc are commonly found as oxides and sulfides.
- Metallurgy refers to the processes used to extract pure metals from their ores.
Uses of Metals
- Used extensively in various domestic and industrial applications.
- Integral to economic development and technological advancements in modern society.
Reactivity of Metals
- Metals vary in their chemical reactivity; some are more reactive than others.
- Reactivity series ranks metals based on their readiness to react, with the most reactive at the top.
Reactivity Series of Metals
- Potassium (K) – Most reactive
- Sodium (Na)
- Calcium (Ca)
- Magnesium (Mg)
- Barium (Ba)
- Aluminum (Al)
- Zinc (Zn)
- Iron (Fe)
- Nickel (Ni)
- Tin (Sn)
- Lead (Pb)
- Hydrogen (H)
- Mercury (Hg)
- Copper (Cu)
- Silver (Ag)
- Gold (Au) – Least reactive
- Platinum (Pt) – Least reactive
Corrosion of Metals
- Corrosion is a significant issue affecting metals, leading to degradation over time.
- Understanding metal properties and reactivity can help mitigate corrosion effects.
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Description
This quiz explores the properties and uses of metals and non-metals, as learned in Class Seven. Delve into the characteristics that distinguish these two categories of elements, along with the impact of corrosion on metals. Test your knowledge on the various elements and their significance.
