12.1 CHAPTER 12. THE PARTICLES THAT SUBSTANCES ARE MADE OF
d. empirical formula
e. ball-and-stick model
3. Ammonia, an ingredient in household cleaners, is made up of one part ni-
trogen (N) and three parts hydrogen (H). Answer the following questions:a. is ammonia a covalent, ionic or metallic substance?
b. write down the molecular formula for ammonia
c. draw a ball-and-stick diagram
d. draw a space-filling diagram
4. In each of the following, say whether the chemical substance is made
up of covalent, molecular structures, covalent network structures, ionic
network structures or metallic structures:
a. ammonia gas (NH 3 )
b. zinc metal (Zn)
c. graphite (C)
d. nitric acid (HNO 3 )
e. potassium bromide (KBr)
5. Refer to the diagram below and then answer the questions that follow:O C Oa. Identify the molecule.
b. Write the molecular formula for the molecule.
c. Is the molecule a covalent, ionic or metallic substance? Explain.
6. Represent each of the following molecules using itschemical formula,
structural formulaand theball-and-stick model.
a. nitrogen
b. carbon dioxide
c. methane
d. argonMore practice video solutions or help at http://www.everythingscience.co.za(1.) 01uq (2.) 01ur (3.) 01us (4.) 01ut (5.) 01uu (6.) 01uv212 Chemistry: Matter and materials