What is your trouble with this? If they are elements they are pure. If mixtures or compounds they are not.
I will get you started.
a. Gold is an element. Pure.
b. air (mixture N2 and O2 and other gases). not pure.
c. white blood (you must mean white blood cells (consists of compounds). not pure.
d. saline solution. That's a mixture of salt and water. not pure.
etc
etc.
Identify the pure substances in the list. If there is more than one, select all the apply.
a) gold (Au)
b) Air (mostly N2 and O2)
c) white blood
d) saline solution
e) alcoholic drink
f) ethanol (CH3CH2OH)
g) elemental oxygen
h) table salt (NaCl)
1 answer