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1. What is science? Science is the systematic study of the natural world that involves observation and experimentation. 2 . What is chemistry? The study of elements and compounds is called chemistry.               Or       The study of elements, compounds, and their properties, structures, reactions, and interactions is called chemistry. It also encompasses the study of how these substances combine and change to form new substances. 3. What is boiling point? The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. 4. What is the boiling point of water?  The boiling point of water is 100°C (212°F) at standard atmospheric pressure (1 atmosphere or 101.3 kPa). 5. What is an element? An element is a substance that is made up of only one kind of atom. 6.What are compounds? Compounds are substances made from two or more different elements that are chemically bonded together. For exam...

 1. Which one of the following is an artificial ecosystem? (a) Pond (b) Crop field (c) Lake (d) Forest Answer: (b) Crop field Explanation: A crop field is an artificial ecosystem because it is created and managed by humans. In this type of ecosystem, humans control various factors, such as the type of plants grown, soil treatment, water supply, and pest control. On the other hand, ponds, lakes, and forests are natural ecosystems that exist without human intervention. 2. In a food chain, the third trophic level is always occupied by (a) Carnivores (b) Herbivores (c) Decomposers (d) Producers 2. Answer: (a) Carnivores Explanation: In a food chain, the third trophic level is typically occupied by carnivores, also known as secondary consumers. The first trophic level consists of producers (plants), the second trophic level consists of herbivores (primary consumers), and the third level consists of carnivores that feed on herbivores. 3. An ecosystem includes (a) All living organisms (b)...

  1.What is an atom? An atom is the smallest particle of an element.  Or An atom is the smallest particle of an element that retains its chemical properties. 2. Mention the  subatomic particles of an atom. The three main subatomic particles of an atom are: 1. Protons Charge: Positive (+) Location: Inside the nucleus Role: Protons determine the atomic number of an element and give the atom its identity. For example, an atom with 1 proton is hydrogen. 2. Neutrons Charge: Neutral (no charge) Location: Inside the nucleus Role: Neutrons contribute to the atom's mass and help stabilize the nucleus. The number of neutrons can vary, resulting in isotopes. 3. Electrons Charge: Negative (−) Location: Orbiting the nucleus in electron shells or energy levels Role: Electrons are involved in chemical bonding and reactions. Their arrangement determines the atom's chemical properties. Together, these subatomic particles form the structure of an atom. 3. What are molecules? A molecule is ...