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Who gave the laws of chemical combination?Ītoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

Do not allow the chemical to spill from the ignition tube while recording the initial mass.

The law is verified only in closed system.

Cork should be used when the chemicals (reactants) are mixed, so that the gas, vapours formed is not allowed to escape.

Subtract the mass of conical flask + cork to get the resultant mass of product.

Fix a cork when solution X and Y are mixed.

Prepare the solution in distilled water only.

Be careful while using the weighing machine.

There is no loss of mass in a chemical reaction.

Mass of the reactants = Mass of the products.

The weight of reactants = Weight of products.

Weight of conical flask + ignition tube when solution X and Y are mixed and reaction has taken place =…….

Initial weight of conical flask + ignition tube with the respective solution X and Y = …….g.

Note the mass of the conical flask before reacti.

Now tilt and swirl the flask gently, so that the solutions X and Y get mixed.

Weigh the flask with its contents carefully.

The solution from the test tube should not spill in the flask.

Hang the ignition tube in the flask carefully as shown in the figure.Take a little amount of solution of Y in a conical flask and some solution of X in an ignition tube.Prepare a 5% solution of any one pair of substances X and Y given.Initial mass of reactant = Final mass of the product (reactant mixture).Within the resonable experimental limits:.Note: Mass of 50 ml of distilled water = 50.0 g Mass of the product formed = C 2 – C 1 = 111.65 g.Mass of reaction mixture on adding in beaker ‘C’ is C 2 = 611.65 g.

To get the mass of the product formed, subtract the mass of beaker ‘C’ before adding the solutions and after adding the solutions from ‘A’ and ‘B’ beaker.Weigh beaker ‘C’ again with the product obtained and record your observations.You will observe the white precipitate that is formed in beaker ‘C’, due to the formation of (BaSO 4) Barium Sulphate.Mix the contents of beaker ‘A’ and ‘B’ in beaker ‘C’ Stir it with glass rod.Now weigh 8.05 g of Na 2SO 4.H 2O in another watch glass of known mass and dissolve it in the other beaker containing 50 ml of distilled water.Dissolve the weighed BaCl 2.2H 2O in the beaker ‘A’.Take 100 ml beaker with 50 ml distilled water in it.Weigh 3.6g of BaCl 2.2H 2O in a watch glass of known mass.Take two watch glasses and weigh them using the physical balance and record their weight.Two watch glasses, beakers, weighing balance and glass rod.ĭistilled water and one of the following sets of chemicals. In chemical reaction, when the reactants react they may take/give heat, gas may be released, bubbles may be formed, colour may change or precipitate may be formed.Nuclear change: The nucleus of an atom can be changed by adding/reducing the number of protons, in it/by splitting of nucleus.įor example, Uranium can undergo fission to become Barium and Krypton.Chemical change: The atoms of reactants rearrange and form new compounds.Physical change: Matter only changes its phase from solid to liquid and from liquid to gas.Chemicals undergo several kind of changes, i.e.This law was proposed by Antoine Lavoisier. Total mass of reactants before reaction = Total mass of the product after reaction The reactants -> atoms of one or more substances simply get rearranged to form product. Law of conservation of mass: In a chemical reaction (except for nuclear reactions as matter can change to energy) mass can neither be created nor destroyed.Matter can neither be created nor destroyed in a chemical change.