1. Single & Double Replacement
Lesson 4.03
Single & Double Replacement

2. Lesson Standards & Objectives
SC.912.P.8.9—Characterize types of chemical reactions, for example: redox, acid-base, synthesis, and single and double replacement reactions.
After completing this lesson, you will be able to:
Identify single and double replacement reactions from examples.
Identify the properties of single and double replacement reactions.
Predict the product produced by single and double replacement reactions.

3. Mastery of Previous Material Required
Lesson 3.05/3.08
How to tell what an ionic bond is
Common charges
List of polyatomic ions
Please review these lessons as needed. Mastery of these lessons will greatly enhance your understanding of the rest of module 4 (and module 5 if you are taking segment 2).
Lesson 4.02 – Balancing reactions
You will be balancing every reaction the rest of this module.

4. Are You Sufficiently Prepared?
If you have not mastered 3.05, 3.08 and 4.02, please take some time to go back and review those lessons. Join our Live help/tutoring sessions offered each week and watch the recorded teaching sessions. Lesson 4.03 will not make sense if you have not mastered the previous lessons!

5. 4.03 – Double Replacement Reaction
Double Replacement Reaction: A type of reaction in which the ions of two compounds exchange places in an aqueous solution to form two new compounds.
AY + BZ → AZ + BY
Ionic compound + ionic compound
How do we know if something is an ionic compound (module 3)?

6. Common Charges
We MUST remember our “Common Charges” from lessons 3.05/3.08 in order to write our products

7. Polyatomic Ions
We MUST also have our polyatomic ion sheet from 3.08 in order to write many of the products.

8. 5 types of Double Replacement Reactions
A salt and a base
Ca(NO3) NaOH → 2NaNO3 + Ca(OH)2
Two Salts
2 KCl + Pb(NO3)2 → PbCl KNO3
3. A Salt and an acid
Ba(NO3)2 + H2SO4 → BaSO HNO3
4. Metal Carbonate and an acid
MgCO HCl → MgCl2 + H2CO3
5. An acid and a base
2HCl + Mg(OH)2 → MgCl H2O

9. Sample Problem #1
Mg(OH) H3PO4 →

10. Sample Problem #2
Mg3P H2SO4 →

11. Sample Problem #3
AlCl K2CO3 →

12. 4.03 – Single Replacement Reactions
Single Replacement Reaction : one element (A) reacts by replacing another (B) element in a compound.
A + BY → AY + B
To predict whether a single replacement reaction will occur, and what its products will be, you must use the “Activity Series” to determine if “A” is more reactive than “B”

13. Activity Series

14. 4 Basic Types Single Replacement Reactions: #1
A metal replacing a metal
a. Na + CuSO4 →
b. Zn + NaCl →

15. Type #2 - Metal Replace H in Water
2. A metal replacing the hydrogen in water
The highly reactive metals (such as the alkali metals in Group 1) react vigorously with water to produce a metal hydroxide and hydrogen gas.
2Na + 2H2O → 2NaOH + H2
Less active metals, such as aluminum and iron, can react with water under the right conditions to produce a metal oxide and hydrogen gas.
Zn + H2O → ZnO + H2
Au + H2O → No Reaction

16. Type #3 - Metal Replace H in Acid
3. A metal replacing the hydrogen in an acid
The more reactive metals can react with certain acids, such as hydrochloric acid and sulfuric acid, to form an ionic compound (a salt) and hydrogen gas.
Pb + 2HCl → PbCl2 + H2

17. Type #4 – Nonmetal Replace Nonmetal
4. A nonmetal replacing a less active nonmetal
A halogen in Group 17 (7A) can replace a less active halogen.
The halogens decrease in reactivity as you go down the group on the periodic table.
F NaCl →

18. Single Replacement Practice Problems
Ca + H2O →
2. Zn + FeSO4 →
3. Br2 + CaCl2 →

19. Single Replacement Summary
Use your activity series
If the element “by itself” is higher on the list, the reaction will occur. Write your products using your common charges, polyatomic ions, and diatomic element knowledge.
If the element by itself is not higher, then write “no reaction” and you are done!

20. Thank you!
It has been great working with you for Double Replacement and Single Replacement Reactions.
Please use our other recorded teaching sessions for the other lessons. Don’t forget that you can use them to review previous lessons too!