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Copper voltameter, to determine the electro chemical equivalent of copper, physics practical std 11 & 12

Copper voltameter

Copper voltameter

AIM :-

Connect given copper voltameter in an appropriate circuit determine the electro chemical equivalent of copper.

PRINCIPLE :-

On passing electric current through CuSO₄solution, Cu⁺² and SO^-2₄ ions are separated or chemical effect of electric current.

PRECAUTIONS

The cathode plate should be throughly cleaned after rubbing with sand paper.

Pass only that much current as is obtained from the calculation of the area of the immersed part of the cathode plate.

Use only a fresh solution of CuSo₄. To prepare the solution dissolve about 25 g of CuSO₄ crystals in 100 cm³ water. Add a few drops of sulphuric acid (H₂SO₄) to make it more conducting.

Hold the plate from its upper end so as to avoid touching its surface.

Cathode plate should be washed immediately after it is taken out of the solution.

PROCEDURE :-

1. To Cathode plate dip in clean water, and wash off all the CuSO₄, solution sticking to it. Thereafter wash it again with tap water.

2. Hold it in the sunshine for some time till it dries out. Now find out its mass by Physical balance.

Anode, Cathod, Sulphuric, Copper, voltameter,

Electric, Solution, Water,

Copper voltameter apparatus

Copper voltameter line diagram

Copper voltameter practical

Copper voltameter practical result

Table of Copper voltameter result

Calculation of copper voltameter

For more details View Video.

Copper voltameter.

BeautifulPictures of Magnet and its properties science std 8 to 12 GSEB

Magnet and its properties

Magnet and its properties picture for science.

Natural magnet

Natural magnet properties

Bar magnet properties

Magnetic Needle

Horse Shoe Magnet

Horse shoe Magnet with Keeper

Different types of Magnet

Bar magnet Properties

Replusion of Bar Magnet

Attract of Bar magnet

Mechanical method of making magnet

Bar magnet keeper

Electric method of making Magnet

Galvanometer using magnet

lines of force of Magnet

Lines of force of bar magnet

Magnetic Lines of force around magnet

Electric meter using magnet

Fuse use for electric

Voltmeter

Uses of different magnets in products

Yoga with Pramoda Patel

Sonometer relation between frequency and the length, GSEB physics practical std 11 & 12

Sonometer

Sonometer

AIM :-

To study the relation between frequency and the length of a stretched string with the help of a sonometer.

PRECAUTIONS

1 The wire should be of uniform cross-section and there should not be any twist or bend in it.

2 The pulley should rotate without friction.

3 Put that much weight in the pan so that the deformation produced in the wire should not exceed the elastic limit.

4 The stem of the tuning fork, not its prongs, should be placed on the sonometer box or on the support.

Apparatus:- A sonometer, tuning forks ( of frequencies from 256 Hz – 512 Hz), a pan or a hanger of known weight, four to five 500 gm weights, a paper rider, a rubber-pad and a meter rule.

Sonometer Apparatus

Sonometer Practical

OBSERVATION TABLE

Sonometer reading

Sonometer Graph

For more details View Video.

To study the relation between frequency and the length of a stretched string with the help of a sonometer.

EFFECT OF TEMPERATURE ON RESISTANCE, GSEB Physics practical std 8 to 12

Effect of Temperature on Resistance

EFFECT OF TEMPERATURE ON RESISTANCE

AIM :-

You are given a Wheatstone bridge, a container filled with a liquid, a resistor made from an iron wire etc. Immerse the resistor in liquid and connect it in an appropriate arm of Wheatstone bridge. Measure the resistance at different temperatures. Draw the graph of resistance versus temperature and from it find the resistance at 20⁰ c and 100⁰c. Use the following formula to determine(a ), the temperature coefficient of resistance.

Formula to calculate Effect of temperature on Resistance

PRINCIPLE :- On increasing the temperature of a conductor its resistance increases.

APPARATUS :- A coil of iron wire, container filled with liquid, a battery (2 V), a rheostat, a sensitive galvanometer, a simple key, a thermometer, a calorimeter, a burner, wire gauge, resistance box.

Apparatus for Effect of Temperature on Resistance

Practical Effect of Temperature on Resistance

Procedure of Effect of Temperature on Resistance

PRECAUTION :-

(1) Keep the iron cylinder completely immersed in liquid.

(2) Keep all connections tight.

(3) Stir the calorimeter for uniform heating of water. Note the temperature of the liquid immediately after the null point is obtained at every observations.

Graph of Effect of Temperature on Resistance

Draw the graph of R_t ® t. it is a linear graph. Extend this straight line on both the sides. Find R₂₀ and R₁₀₀ at the temperatures 20 ⁰C and 100 ⁰C respectively.

R₂₀ = …………… W at temperature 20 ⁰C

R₁₀₀= …………… W at temperature 100⁰C

\ The temperature co-efficient of resistance of the given iron-wire is

RESULT :- Temperature coefficient of resistance at given iron wire a = ………( ⁰c) ^-1

Beautiful Science Picture of Accessories use In Laboratory for students 8 to 12 std GSEB

Beautiful Science Accessories use in Laboratory.

Accessories used in Science Laboratory

Practical’s in chemistry and introduction of apparatus used

Before beginning the experiment in chemistry the student should have aware about

Principle,

Aim,

Apparatus,

Chemicals used in experiments,

experimental method,

systematic note of observation during the experiment chemical reactions and scientific conclusion.

Apparatus used during the experiment :

Test tube, Spatula, Tong, Stand, Test tube holder, Wire gauge, Tripod stand, Wash bottle, Measuring cylinder, Thistle funnel, Funnel, Distillation flask, Bunsen burner, Condenser, Watch glass, Dropper, Beaker, Conical flask, Evaporating dish etc.

During experiments, should not taste or drink solutions, nor touch or smell hot solutions or apparatus.

If the need arises to smell, slowly and carefully do the same.

Care should be taken to handle Bunsen burner.

Glass rod should be used to stir the solution.

Acid should always be added in the container containing water.

Test tube,

Spatula,

Tong,

Stand,

Test tube holder,

Tripod & wire gauge,

Wash bottle,