1. Heating of Copper (Cu) in the Presence of Oxygen: When copper is heated in the presence of oxygen, it forms copper(II) oxide. 2Cu + O₂ → 2CuO 2. Heating of Iron (Fe) in the Presence of Oxygen: When iron is heated in the presence of oxygen, it forms iron(III) oxide. 4Fe + 3O₂ → […]
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Mineral 🆚 Ore Feature Mineral Ore Definition A naturally occurring inorganic substance with a definite chemical composition and crystalline structure A type of mineral that contains a sufficient amount of a metal or valuable element that can be economically extracted Composition Can contain metals, non-metals, or a mixture of both Contains a high concentration of
Roasting: Roasting is a metallurgical process in which a sulfide ore is heated in the presence of excess oxygen (air) to convert it into an oxide. This process often releases sulfur dioxide (SO₂) gas as a byproduct. Calcination: Calcination is a thermal treatment process in which an ore or other solid material is heated in
An amalgam is a mixture of mercury with other metals. It’s often used in dental fillings. Elements in Solder Solder is a metal used to join other metals together. The main types are: Lead-free solder is now more common because it’s safer for health and the environment. Lead-free solder 🆚 Lead-based solder Feature Lead-Free Solder
What is an amalgam? Write the constituent elements of solder. Read More »
Aluminum (Al) is commonly used for making electric wires, not lead (Pb). Reasons: Lead is not used for electrical wires due to its low conductivity and potential health hazards. ⚛️ Atomic properties of Lead (Pb) and Aluminum (Al): Property Lead (Pb) Aluminum (Al) Atomic Number 82 13 Atomic Mass Approximately 207.2 amu Approximately 26.98 amu
Which metal can be used for making electric wires: Pb or Al? Read More »
Gold is used for jewelry because: Chemical Properties of Gold:
The most abundant metal in Earth’s crust is aluminum (Al). It makes up about 8.23% of the Earth’s crust by weight. Aluminum is commonly found in minerals like bauxite, which is the primary ore used to extract aluminum. Despite its abundance, aluminum is not found in its pure form in nature; it is always combined
Ionic compounds have high melting points because of the strong electrostatic forces of attraction between the oppositely charged ions in their structure. These forces, known as ionic bonds, hold the positive and negative ions together very tightly in a solid lattice structure. To melt an ionic compound, a significant amount of energy is required to
Two alloys with electrical conductivity lower than that of pure metals are: Both of these alloys have lower electrical conductivity compared to pure copper, which is one of their primary metal components. Electrical conductivity is how well a material can carry or conduct electricity. In short, the higher the electrical conductivity, the better the material
Name any two alloys whose electrical conductivity is less than that of pure metals. Read More »
Food cans are coated with tin instead of zinc because:
Why food cans are coated with tin and not with zinc? Read More »
The reaction between zinc oxide (ZnO) and sodium hydroxide (NaOH) can be represented by the following chemical equation: This reaction is a classic example of an amphoteric oxide. Zinc oxide can react with both acids and bases. In this case, it acts as an acid and reacts with the base, sodium hydroxide, to form sodium
Reaction between zinc oxide and sodium hydroxide by a chemical equation. Read More »
► Ores Ores are naturally occurring rocks or minerals from which valuable metals or other elements can be extracted profitably. For example, bauxite is an ore from which aluminum is extracted, and hematite is an ore from which iron is obtained. ► Gangue Gangue refers to the unwanted or worthless materials that are found alongside
Define the following terms: ores, gangue, rust, aqua regia, anodizing. Read More »
