Question

Answer the question please​

Answer 1

Answer:

1. In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution. Lower values correspond to solutions which are more acidic in nature, while higher values correspond to solutions which are more basic or alkaline. At room temperature, pure water is neutral and therefore has a pH of 7.

Answer 2

➪The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

➪An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.

➪Example

C5H12 + O2 ---> CO2 + H2O

Answer »

There are five carbons on the left but only one on the right, and on each side the carbon is in a single chemical species. Put a 5 in front of the CO2 on the right hand side.

C5H12 + O2 ---> 5CO2 + H2O

There are twelve hydrogens on the left but only two on the right hand side, and hydrogen is in a single species on each side. Put a 6 in front of the H2O on the right hand side.

C5H12 + O2 ---> 5CO2 + 6H2O

Finally, there are only two oxygens on the left hand side but 16 of them on the right hand side. So put a 8 in front of the O2 on the left hand side.

C5H12 + 8O2 ---> 5CO2 + 6H2O

It's now a balanced chemical equation.