Question

Id give a reason for your bo cac" the defir Biochem/pH review 1. State whether cach of the following is a molecule or an atom and give a reason for answer: Na CO2 KCI COOH Students in an animal physiology lab were experimenting with various imitations of body fluids to see the effects of adding an acid to a sample of the fluid. The experiment yielded the following data: pH after 30 drops of acid Initial pH of solution Solution pH after 10 drops of acid 7.4 pH after 20 drops of acid 7.37 7.35 Blood plasma 7.4 4.5 Urine 6.4 5.8 5.0 Tissue fluid 7.42 7.38 Stomach secretion Bile How are blood plasma and bile different in terms of their response to acid addition? What accounts for this difference? Why does tissue fluid behave similarly to blood plasma? Inok at the urine. Initially it has a pH of 6.4 which drops to 5.8 upon the addition of acid Why does it not drop as rapidly as the pH of bile nor as slowly as the pH of plasma

Answer 1

Answer to the first question is given here.

An atom is the smallest unit of mass containing a nucleus surrounded by electrons. A molecule is a particle that is made up of 2 or more atoms combined by chemical bonds.

CO₂ is a molecule because it is a combination of one Carbon atom and two Oxygen atoms chemically bonded to each other.

Na⁺ is atom because it is made up of a single nucleus surrounded by electrons.

H⁺ is atom because it is made up of a single nucleus surrounded by electrons.

COOH is a molecule because it is a combination of one Carbon atom, one Hydrogen atom and two Oxygen atoms chemically bonded to each other.

Ca²⁺ is atom because it is made up of a single nucleus surrounded by electrons.

KCl is a molecule because it is a combination of one Potassium atom(carrying positive charge) and one Chlorine atom(carrying negative charge) chemically bonded to each other.