: You can find a complete breakdown of unit answers on Scribd , which includes Unit 7: Living Things and Air.

ii Tar accumulates on smokers' air sac. ( 1 m) This slows down / hinders gas exchange. ( 1 m) Smokers have to breathe faster (1 m) Acids and Alkalis Unit 9 Answers | PDF | Ph - Scribd

By focusing on understanding rather than simply finding the , you turn a homework task into real scientific literacy. And that, truly, is the only answer that matters for your future exams.

: Identification of acidic and alkaline substances using indicators (litmus paper, pH paper, and natural indicators like red cabbage).

Always wear safety goggles and gloves when handling corrosive chemicals. If acid splashes in eyes, wash with an eye wash bottle for at least 10 minutes. Unit 10: Sensing the Environment