Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Chemistry is the branch of science that deals with the study of the composition, structure, and properties of matter, and the changes it undergoes.
In Agriculture, chemistry provides fertilizers like Urea , Ammonium nitrate , and pesticides to enhance crop yield and protect plants from pests.
In Food Industry, chemical preservatives like Sodium benzoate are used to increase the shelf life of food products.
In Medicine, chemistry is vital for the development of antibiotics like , analgesics for pain relief, and the production of life-saving (Oxygen) gas.
In Clothing, chemistry helps in the production of synthetic fibers such as , , and , which are more durable than natural fibers.
In Industry, chemistry is used in the manufacture of soaps, detergents, plastics like (Polyvinyl Chloride), and glass.
Chemistry helps in understanding the environment and controlling pollution by developing eco-friendly fuels and treatment methods for waste.
📐Formulae
💡Examples
Problem 1:
Name a chemical compound used in the agriculture industry as a fertilizer and provide its chemical formula.
Solution:
Urea,
Explanation:
Urea is a nitrogen-rich chemical compound that is widely used in farming to provide essential nutrients to plants for better growth.
Problem 2:
Identify the chemical symbol for the gas used in hospitals for patients with breathing difficulties and the formula for the salt we consume in our daily diet.
Solution:
and
Explanation:
represents Oxygen, which is essential for respiration, and represents Sodium Chloride, commonly known as table salt.
Problem 3:
Which chemical is often used as a food preservative to prevent spoilage by microbes?
Solution:
Sodium benzoate ()
Explanation:
Sodium benzoate is a salt that inhibits the growth of bacteria, yeast, and molds in acidic food products like jams and pickles.