Basic concept of chemistry

1. Biochemistry Lecture
GBSN (Unit 1)
Basic concept of Chemistry
by,
Miss Areesha Ahmad
Lecturer

14. Plasma is often called “the fourth state of matter,” along with solid, liquid and gas. Just as a liquid will boil,
changing into a gas

17. Atom

40. pH
• In chemistry, pH also referred to as acidity or basicity, historically denotes
"potential of hydrogen" (or "power of hydrogen").
• It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions.
•
• A solution with a higher concentration of hydrogen ions than pure water is an acid, while
a solution with a lower concentration is a base.
• The pH scale is logarithmic and inversely indicates the activity of hydrogen ions in the
solution.
• pH is measured on a scale of 0 to 14. On this scale, a pH value of 7 is neutral, which
means it is neither acidic nor basic. A pH value of less than 7 means it is more acidic, and
a pH value of more than 7 means it is more basic.