Question

pls answer this anyone

Answer 1

ohms law states that the current flowing through the conductor is directly proportional to the potential difference across the ends of the conductor.

V=IR
Resistance is defined as the ratio of the potential difference across the ends of the conductor to the current flowing through it.
30 units-
electric charge - coulomb
current - ampere

Answer 2

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✔️(1) Products are Zinc Chloride and Hydrogen.

✔️(2) Magnesium ribbon should be cleaned before burning in air because it have a coating of Magnesium oxide formed due to the slow reaction of moist air. So this layer is removed by rubbing with sand paper.

✔️(3) We apply paint on iron particles to prevent it from rusting.

✔️(4) Curd and sour substance contains acids which reacts with brass and copper vessels. Thus, brass and copper get corroded and make the food unfit for eating.

✔️(5) An aqueous solution of an acid conducts electricity because it contains H+ ions.

✔️(6) The common name of CaOCl2 is bleaching powder.

✔️(7) Bleaching powder is produced by the action of Chlorine on Dry Slaked Lime.

✔️(8) Washing Soda is used to remove the hardness water.

✔️(10) The ability of metal to be beaten up into thin sheets is called Malleability.

✔️(11) The ability of a metal to be drawn into thin wires is called ductility.

✔️(12) School bells are made up of metals because they are sonorous. It make sound on striking a hard surface.

✔️(13) Iodine is a non-metal which is lustrous.

✔️(14) Gallium and Caesium are two soft metals.

✔️(15) Sodium reacts vigorously with air that it catch fire if it kept in the open. Hence, to protect it and to prevent accidental fires they are kept immersed in kerosene.

✔️(16) All metals are generally solids at room temperature. Buy mercury is liquid at room temperature.

✔️(18) Gold, Silver, Platinum are the metals which don't corrode.

✔️(19) An alloy is a homogeneous mixture of two or more metals or a metal and non metal.

✔️(20) Platinum, Gold and Silver are used to make jewellery because they are very lustours. Also they are very less reactive and don't corrode easily.

✔️(21) Dobereiner tried to arrange the elements with similar properties into groups. He identified some groups having three elements each. So he called these groups traits.

✔️(22) Octaves means every eight element is similar to that of first.

✔️(23) Johann Wolfgang Dobereiner proposed Law of Traids.

✔️(24) John Newland proposed the Law of Octaves.

✔️(25) Mendeleev's Periodic Law states that “the properties of elements are the periodic function of their atomic masses”.

✔️(26) Modern Periodic Law states that “the properties of elements are periodic function of their atomic number”.

✔️(27) The unique ability to form bonds with other atoms, giving rise to large molecules. This property is called Catenation.

✔️(28) The valency of element first increases then decreases in period going left to right .

✔️(29)

⏺Ohm's Law :- The potential difference across the end of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provides it temperature remains the same. This is called Ohm's Law.

⏺Power :- The rate at which electric energy is consumed in an electric is called Power

⏺Resistance :- It is the property of a conductor to resist the flow of charges through the circuit.

⏺1 Coulomb :- 1C is constituted by the flow of 1A of current in 1s.

⏺ Potential Difference :- Potential Difference between two points in an electric circuit carrying some current as the work done to move a unit of charge from one point to the other.

⏺1 volt :- 1 V is the potential difference between two points in a current carrying conductor when 1 J of work is done to move a charge of 1 C from one point to the other.

⏺1 ohm :- If potential difference across the two ends of a conductor is 1 V and the current through it is 1 A, then the resistance of the conductor is 1 ohm.

✔️(30)

a. Ampere (A)

b. Coulomb (C)

c. Joule (J)

d. Ohm meter

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