FUE Homework Chemistry Worksheet

Homework #3

1. Which pairs of elements are likely to form ionic bonds (I) and which pairs are likely to form covalent bonds (C)?

a. Carbon and hydrogen _____

b. Sodium and sulfur _____

c. Hydrogen and oxygen _____

d. Magnesium and bromine _____

2. Positively charged ions are called _______________________ and negatively charged ions are called ______________________________

3. When the following atoms become ions what charges do they acquire?

a. Li _____

b. S _____

c. Ca _____

d. F _____

4. Write

the ion symbol for the atom with the given number of protons and electrons.

5. What

element fits each description?

a. Four protons and two electrons ______

b. 22 protons and 20 electrons _____

c. 16 protons and 18 electrons _____

d. 13 protons and 10 electrons _____

a. A period 2 element that forms a +2 cation _____

b. An ion from group 7A with 18 electrons ______

c. A cation from group 1A with 36 electrons _____

6. What

a. b. c. d.

7. Write a. b. c. d. e.

noble gas has the same electronic configuration as each ion?

O2- _____ Mg2+ _____ S2- _____ Cl- _____

the chemical formula for an ionic compound composed of each pair of ions. the sodium ion and the sulfur ion _______________________

the aluminum ion and the fluoride ion ___________________

the 3+ iron ion and the oxygen ion ______________________

the calcium ion and the nitrate ion ______________________ the magnesium ion and the carbonate ion _________________

8. The recommended dietary allowance for calcium for teenage children is 1,300 mg per day. If a typical 8.0-fl oz glass of reduced-fat milk contains 298 mg of calcium, how many fluid ounces of milk does a teenager need to drink to get the entire recommended amount of calcium from this milk?