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Rusting is a chemical process in which iron reacts with oxygen and moisture (water) from the air to form a reddish-brown substance called rust (iron oxide). It is a type of chemical change and leads to the weakening a...
Physical Change:· A change in which no new substance is formed.· The change is usually reversible.· Examples: Melting of ice, boiling of water, tearing of paper.Chemical Change:· A c...
Natural indicators are substances found in nature that change color when they come into contact with acids or bases, helping us identify the pH of a solution without using synthetic chemicals.Examples of natural indica...
Acids: Sour taste (e.g., lemon juice) Bases: Bitter and soapy (e.g., baking soda) Identified using indicators like litmus: acids turn blue litmus red, bases turn red litmus blue.
A thermometer measures temperature. The clinical thermometer is used to measure body temperature, usually in Fahrenheit.
Conduction: Heat transfer in solids (e.g., metal rod) Convection: In liquids and gases (e.g., boiling water) Radiation: Without medium (e.g., sunlight)
Silk is obtained from the cocoon of the silkworm. The process involves rearing of silkworms, harvesting cocoons, and extracting silk threads by boiling.
Steps include: Shearing Scouring Sorting Dyeing Spinning Weaving or knitting
Chewing the Cud (First Chewing)· Cows quickly chew and swallow grass without chewing it completely.· The food goes into the first part of the stomach called the rumen, where bacteria start breaking d...
Mouth (chewing & saliva) Esophagus (food pipe) Stomach (acid & enzymes) Small intestine (digestion & absorption) Large intestine (water absorption) Anus (waste removal)
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