Science 10 DP Ionic and Covalent Compounds Assignment Name: ______

Using your knowledge of ionic and covalent bonding, answer the following questions. For questions that require explanation, be sure to be clear and concise.

1. Examine the electron dot diagrams of three hypothetical elements:

a. Which elements are non-metals? How do you know?

b. Predict which element(s) will not combine with oxygen. Give reasons to support your answer.

2. An unknown element forms ions with a -2 charge.

a. Classify the element as a metal or non-metal. Give reasons to support your decision.

b. In what group would you expect to find this element?

3. Ionic compounds are considered to be electrolytes because when they are dissolved in water, they are able to conduct electricity. Determine which of the following compounds are probably electrolytes by placing a check in the appropriate column.

Forms electrolyte Does not form electrolyte

a. KBr

b. AlCl3

c. C3H8

d. CS2

e. CaF2 4. Which types of elements combine to form molecular compounds? Give one example.

5. Could a lithium atom and a hydrogen atom share a pair of electrons to form a covalent bond? Why or why not?

6. Element Q has 2 valence electrons and element X has 5 valence electrons.

a. Which element is the metal? _____

b. Which is the non-metal? _____

c. If they combine to form an ionic compound, what would be the chemical formula of the compound?

7. For each of the following compounds, determine if they are ionic or covalent. i. Using the proper method, show how the bonds between each element form (give/take or share). ii. Determine the type of bond formed (ionic or covalent and if covalent, single, double, or triple bond).

a. K2O b. Cs3N

Ionic or covalent? ______Ionic or covalent? ______Type of Bond if covalent? ______Type of Bond if covalent? ______

c. H2O d. N2

e. Al2S3 f. H2