- Alloys are homogeneous mixtures of metals (or metals with non-metals) with different properties than pure metals—often harder, less conductive, and with lower melting points.
- 24-carat gold is soft, so 22-carat gold (an alloy with copper or silver) is used in jewellery to improve strength.
- Solder, an alloy with a low melting point, is used to join electrical wires.
- Corrosion prevention methods include painting, galvanising, anodising, electroplating, and alloying.
- Galvanising, tinning, anodisation, and electroplating all involve protective coatings to prevent corrosion, while alloying enhances durability and resistance.
Definitions [13]
Define: Elements
Element is a substance which cannot be broken further into simpler substances and has a definite set of properties. Elements are made up of only one kind of atoms.
Define: Formula
Formula: Formula is a short way of representing the molecule of an element or a compound
Define: Atom
Atom: An atom is the smallest indivisible unit of an element which exhibits all the properties of that element and may or may not have an independent existence. An atom is the smallest indivisible unit of an element which exhibits all the properties of that element and may or may not have an independent existence.
Define the term: Element
Element is a substance which cannot be split up into two or more simple substances by usual chemical methods of applying heat, light or electric energy; for example, hydrogen, oxygen and chlorine.
Define: Molecule
Molecule: A molecule can be defined as the smallest unit of an element or a compound which exhibits all the properties of that element or compound and has an independent existence. They are divisible into atoms.
Define: Compounds
Compounds are pure substances composed of two or more elements in definite proportion by mass and has properties, entirely different from those of its constituents elements.
Compound, are made up of different types of atoms combined chemically.
Define Elements.
Elements: An element is defined as a pure substance made up of only one kind of atoms that cannot be converted into anything simpler than itself by any physical or chemical process.
Define mixture.
“Mixtures can be defined as. a kind of matter which is formed by mixing two or more pure substances (elements and compounds) in any proportion, such that they do not undergo any chemical change and retain their individual properties. Therefore they are impure substances.
Define:
Atomicity
The number of atoms in a molecule of an element is called its atomicity.
Definition: Non-metals
Non-metals, except hydrogen, are the elements which form negative ions by the gain of electrons.
Definition: Metalloids or Semi-Metals
Certain elements which show properties of both metals and non metals are called metalloids or semi-metals.
Metal is a solid material which conduct heat & electricity ,hard, shiny, malleable, fusible, and ductile. Nonmetal is a substance that does not exhibit properties of metals such as hardness, luster, malleability ,ductility and the ability to conduct electricity.
Definition: Corrosion
Corrosion is the gradual damage of metals caused by their reaction with components of the atmosphere, such as oxygen and moisture.
Key Points
Key points: Prevention of Corrosion
