Q1 of 29 Page 85

Draw the diagram to show the experimental setup for the law of conservation of mass.

Step 1: Take a flask and take a mixture of sodium hydroxide solution and copper sulphate solution.


Step 2: Weight the flask and note it.


Step 3: Now mix the whole mixture thoroughly.


Step 4: Now, weight the flask.



We will observe that after mixing there is no change in the mass. This explains the law of conservation of mass.


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2

Explain the process and precautions in verifying law of conservation of mass.

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15.9g. of copper sulphate and 10.6g of sodium carbonate react together to give 14.2g of sodium sulphate and 12.3g of copper carbonate. Which law of chemical combination is obeyed? How?

 4

Carbon dioxide is added to 112g of calcium oxide. The product formed is 200g of calcium carbonate. Calculate the mass carbon dioxide used. Which law of chemical combination will govern your answer.

 5

0.24g sample of compound of oxygen and boron was found by analysis to contain 0.144g of oxygen and 0.096g of boron. Calculate the percentage composition of the compound by weight.