5 hydrogen plus oxygen produce water remember diatomic elements

Assignment: Writing Chemical Equations

Directions: Write the correct equation for each word equation given below. These reactions need to be balanced, too, once you complete the correct formulas. The first equation is done for you as an example to follow . The font used here is Garamond so the I (capital i), 1 (one) and l (lower case L) look slightly different. 2013-2014, SM2

Use this list of polyatomic ions to help you write the formulas:

CO32- --- carbonate

OH1- --- hydroxide

ClO31- ---chlorate

Remember the 7 diatomic elements:

H2, N2, O2, F2, Cl2, Br2, and I2

Also remember that a subscript can be easily made by highlighting the number and pressing the CTRL and = keys.

1. Sodium and chlorine react to make sodium chloride. (HINT: chlorine is diatomic when not combined.)

Step 1: Write formulas: Na + Cl2 ( NaCl Step 2: Balance the equation: 2 Na + Cl2 ( 2 NaCl

2. Hydrogen and oxygen combine to form water. (HINT: hydrogen and oxygen are diatomic when not combined.)

Step 1: Write formulas: H2 + O2 ( H2O,

Step 2: Balance the equation:       H2 +       O2 (       H2O

3. Magnesium reacts with gaseous oxygen to form magnesium oxide. (HINT: remember diatomic elements)

Step 1: Write formulas:       +       (      

Step 2: Balance the equation:

4. Magnesium carbonate decomposes into magnesium oxide and carbon dioxide. (HINT: Carbonate is a polyatomic ion.)

Step 1: Write formulas:       (       +      

Step 2: Balance the equation:

5. Lithium oxide and water combine to make lithium hydroxide.

Step 1: Write formulas:       +       (      

Step 2: Balance the equation:

6. Cobalt (II) bromide and sodium iodide react to produce cobalt (II) iodide and sodium bromide. (HINT: Cobalt is a transition element and the name Cobalt (II) means Co2+.)

Step 1: Write formulas:       +       (       +      

Step 2: Balance the equation:

7. Phosphorus plus oxygen produces phosphorus trioxide.

Step 1: Write formulas:       +       (      

Step 2: Balance the equation:

8. Aluminum bromide and lithium react to form lithium bromide and aluminum.

Step 1: Write formulas:       +       (       +      

Step 2: Balance the equation:

9. Sulfur dioxide and bromine and water react to form hydrogen bromide and sulfuric acid (H2SO4).

Step 1: Write formulas:       +       +       (       + H2SO4

Step 2: Balance the equation:

10. Iron (II) oxide and carbon react to produce carbon dioxide and iron.

Step 1: Write formulas:       +       (       +      

Step 2: Balance the equation: