1. Explain the structure of an Atom.
2. What is electroplating. List few uses of it.
3. Why electric fires are extinguished with either using CO2 extinguisher or mud but not water?
4. Does distilled water conduct electricity? what will happened if we add sugar or salt to it. Explain
Answers
Answer:
Ans 1 ) An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton).
Ans 2 ) the process of coating the thin layer of metals with desired metal to resist from rust is called electroplating. 1-Tin cans used for storing food are made by electroplating tin metal on to iron. 2-it is used in bicycle to resist rust or corrosion. 3-it is used in jewellery to make it lusturous.
Ans 3 ) Why electric fires are extinguished with either using CO2 extinguisher or mud but not water? Answer: As water is a good conductor of electricity so it can cause electrocution. Hence, water is avoided in extinguishing electric fires
Ans 4 ) The sugar is the covalent compound and it will not ionize in water to form ions which makes the water conductive. When the salt is added to the distilled water, then it makes the solution which can conduct the electricity.
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