Class 7 Materials: Metals and Non-Metals

Noble metals, like gold and platinum, are less reactive and can be found in their native state.

An ore is a rock from which a metal can be profitably extracted due to its high metal content.

Metals are good conductors of heat and electricity, and they are malleable.

<p>A metal's native state refers to its occurrence in nature in a pure, uncombined form.</p> Signup and view all the answers

<p>Metals are vital for various industries, including construction, electronics, and manufacturing.</p> Signup and view all the answers

<p>Non-metals are generally poor conductors of heat and electricity and are brittle when solid.</p> Signup and view all the answers

<p>Noble metals are not very reactive and often do not corrode easily.</p> Signup and view all the answers

<p>Gold is a noble metal commonly used in jewelry and electronics.</p> Signup and view all the answers

<p>They are generally found as chlorides and carbonates.</p> Signup and view all the answers

<p>Metallurgy is the series of processes carried out to extract pure metals from their ores.</p> Signup and view all the answers

<p>Metals play an important role in both domestic and industrial uses, contributing to development.</p> Signup and view all the answers

<p>It indicates the order of metals based on their readiness to combine with other elements.</p> Signup and view all the answers

<p>Potassium (K), Sodium (Na), Calcium (Ca).</p> Signup and view all the answers

<p>Platinum (Pt).</p> Signup and view all the answers

<p>Aluminium (Al) and its oxide is bauxite (Al2O3).</p> Signup and view all the answers

<p>Metals are increasingly used in modern machines and conveniences.</p> Signup and view all the answers