Science Question

Chem 104NAME_____________________
Homework#4
Due Monday February 21, 2022
1. Compare/define an ionic bond and a covalent bond.
2. Label each statement as True or False
a. Ionic compounds have low melting points. _____
b. Ionic compounds are usually solids at room temperature. ____
c. Most ionic compounds are soluble in water. _____
d. When an ionic compound dissolves in water, the solution conducts electricity. __
3. Write the formula for the ionic compound formed from each pair of elements.
a. Aluminium and sulfur ________________
b. Manganese (II) and chlorine _________
c. Zinc (I) and oxygen __________________________
d. Magnesium and fluorine ______________
e. Magnesium carbonate _____________________________
f. Copper (II) hydroxide ___________________________
g. Lithium phosphate _________________________________________
4. Answer questions 4, 7, & 9 in section 4.2 of your on-line book (Covalent
Compounds – Formulas and Names)
Chem 104
NAME_____________________
5. Name each ionic compound.
a.
Na2O ____________________________________
b. AgCl _____________________________________
c. RbBr __________________________________
d. BaS ______________________________________
e. CoBr2 _______________________________
f. PbS2 ____________________________________
g. NH4Cl ________________________________
h. Cu(NO3)2 ______________________________
i. PbSO4 __________________________________
6. How many covalent bonds does an oxygen atom typically form? Why? How many
lone pairs of electrons does an oxygen atom typically have?
7. Draw a valid Lewis structure for each molecule.
a. HCl
b. BH3
c. CH2Cl2
d. CO