Practice 4.2                                                                             Name________________________________________

 

1. Write the numbers and kinds of atoms or ions contained in the following compounds:

a. NaCl ___________________________________

b. CO2 ___________________________________

c. KBr ___________________________________

d. NH3 ___________________________________

e. MgO___________________________________

2. Explain why a substance with a network structure has a high melting point.

 

 

 

 

 

 

 

3. Determine whether the following are ionic or covalently bonded.

a. NaCl ___________________________________

b. CO2 ___________________________________

c. KBr ___________________________________

d. NH3 ___________________________________

e. MgO___________________________________

4. Explain why solid table salt is a poor conductor of electricity, while salt water is a good conductor of electricity.

 

 

 

 

 

 

5. Explain why table salt does not melt easily.

 

 

 

 

 

 

 

6. Contrast ionic and covalent bonds.

 

 

 

 

 

 

7. Predict whether a gold ring would be a good conductor of electricity. What kind of bonds does gold have? How do these bonds explain gold’s properties?


8. Show how the following compounds form using covalent bonds.

 

a. CCl4

 

 

 

 

 

 

 

 

            b. H2S

 

 

 

 

 

 

 

            c. PF3

 

 

 

 

 

 

            d. I2

 

 

 

 

 

 

            f. CH4

 

 

 

 

 

 

            g. CH3OH