CHM1025C Module One Sample Test

Part C1: Compounds and Chemical Formulas (Section3.4) 


1.   State the Law of Definite Composition:





2.   Define Molecule:





3.   The chemical formula for vitamin B3 is:  C6H6N2O


In One Molecule How Many:


_____ carbon atoms


_____ oxygen atoms


_____ total atoms


4.   Write the chemical formula for Vitamin B6 which has eight Carbon atoms, 11 Hydrogen atoms, one Nitrogen atom, and three Oxygen atoms:



How many total atoms are there in one Vitamin B6 molecule?


5.   Citric Acid (in citrus fruit) has the following chemical formula:




In one molecule of Citric Acid, How many:


______Carbon atoms


______Oxygen Atoms


______ Hydrogen Atoms


______ total atoms