Chemistry Syllabus 2024-25 Examination - Free PDF Download
FAQs on ICSE Syllabus for Class 7 Chemistry
1. What are physical properties and physical changes?
A substance's physical properties are those characteristics that describe its physical nature. Physical qualities such as color, density, shape, size, and volume are examples. A change in the physical qualities of a substance is referred to as a physical change.
The physical change does not create a new substance, but it can change the shape and size of one that already exists. The concepts of physical properties and physical changes are quite important to learn. They should be learnt if you want ICSE Class 7 Chemistry.
2. What are some common physical changes?
Melting is the transformation of a substance from a solid to a liquid state. To transform a solid into a liquid, heat or pressure must be applied to it. For instance, ice melts to become water.
Freezing is the transformation of a liquid into a solid state. It necessitates the liquid substance being cooled below its freezing point. The formation of ice from water is one example.
Condensation is the process through which a gaseous state transforms into a liquid state as a result of cooling. For instance, while cooking food, water droplets accumulate on the vessel's lid.
3. What is the use of metalloids?
Boron is a mineral that is used to make borosilicate glass. It works as an insecticide and acts as a retardant.
Silicon: A semiconductor that is used in a variety of electrical devices. Also used in high-temperature waxes and greases, as well as explosives and fireworks.
Germanium is used in wide-angle lenses, fiber optics, and cell phones.
Arsenic: Used to protect wood from infection and to treat cancer, as well as in copper-lead alloys.
Antimony is utilized in antiseptic medications, bullet alloys, and cable sheathing. Automobile seat covers are used in planes.
4. How is rusting prevented?
In order to prevent rusting, the interaction between oxygen and moisture should be blocked off
By frequently applying a red coat of red lead oxide or grease.
Galvanization is the process of depositing a zinc coating on iron.
Chrome plating keeps iron goods like spoons and taps from rusting.
Tin plating, which involves applying a thin layer of tin to iron sheets. Galvanization is preferable over tin plating.
Enameling prevents corrosion on cooking appliances and refrigerators by coating them with a mixture of iron or steel and silicates.
5. What are the uses of common metals?
The uses of common metals are:
Aluminum is used to produce utensils, paints, packaging, and electrical cables because it conducts electricity.
Zinc is utilized in the galvanization process and as a negative electrode in dry cells.
Iron: Iron is used in drain pipes, tanks, cars, and bridges.
Lead is used in bullets and flexible pipes.
Gold is used in jewelry production because it shines and does not corrode.
Magnesium is a chemical element that is utilized in fireworks and photography.
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