me 160 12. Anaerobic bacteria digest animal waste and produce biogas (Chang- ( statements pertain to these changes. Choose the correct one. (i) Process - A is a chemical change. a (ii) Process – B is a chemical change.
Answers
Explanation:
As we know anaerobic bacteria are bacteria that do not live or grow when oxygen is present in humans .and chemical change may be defined as the , when a chemical substances is transformed into one or more different substance , such as when iron being rust or displacement of zinc from zinc sulphate via copper .
Chemical change occurs or produces through a chemical reaction and the resulting substance has different properties from reactant because their atoms or molecules are differently arranged .
Some examples are , digestion of food , burning of paper , chemical battery usage , baking of cake etc .
Now , comes to the solution part in change A ,
Anaerobic bacteria digest animal waste and produce biogas that means a new product is formed that is biogas at the end of reaction .
animal waste(input)→biogas(output)animal waste(input)→biogas(output)
From the above reaction , it is clear that change A is a chemical change .
In change B , biogas is then burnt as fuel that is energy is formed as a new product .
fuel→energy+ashfuel→energy+ash
New products are formed from old reactants , hence change B is also a chemical change .
The correct answer is option C.