Short Answer
In this figure taken from your text,identify the substances shown. 
-substance 18
Definitions:
Related Questions
Q7: In an enzyme,the polypeptide chain folds into
Q11: Iron rusting is a chemical change.
Q16: The nuclear symbol of helium, <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6909/.jpg"
Q33: Which of the following examples illustrates a
Q37: A deficiency of which amine is responsible
Q38: An object with a temperature of 20
Q43: In the nuclear equation of beta decay,_.<br>A)the
Q49: According to the atomic theory,_.<br>A)all atoms are
Q75: The basic unit of mass in the
Q123: substance 15