classifying chemical reactions

Question 1

A+B–>AB

• Example: hydrogen and oxygen combine and make water- 2H₂+O₂–>2H₂O
• 2 molecules of hydrogen are needed to react with 1 molecule of oxygen to form 2 molecules of water.

Answer 1

Synthesis/Combination

Question 2

AB–>A+B

• More than one molecule of water is needed to start the reaction.
• Example: When water decomposes, it makes hydrogen and oxygen gas- 2H₂O–>2H₂+O₂
• 2 water molecules produce 2 molecules of hydrogen gas and 1 molecule of oxygen gas.

Answer 2

Decomposition

Question 3

AB+C–>A+BC
A+BC–>B+AC
* Only one element is trading partners

Answer 3

Single Replacement

Question 4

AB+CD–>AC+BD

• Two elements trade partners.
• No mass is lost.

Answer 4

Double Replacement

Question 5

CH₄+2O₂–> CO₂+2H₂O+Energy

* Compounds of hydrogen and carbon react with oxygen to form carbon dioxide and water.

Answer 5

Combustion

Question 6

What type of reaction is 2Mg+O₂–>2MgO

Answer 6

Synthesis

Question 7

What type of reaction is 2H₂O₂–>2H₂0+O₂?

Answer 7

Decomposition

Question 8

What type of reaction is Mg+2HCl–>MgCl₂+H₂?

Answer 8

Single Replacement

Question 9

What type of reaction is NaOH+HCl–NaCl+H₂O?

Answer 9

Double Replacement

Question 10

Metal + H₂O –> Metal hydroxide + H₂

Answer 10

single replacement of active metal with water

Question 11

acid + base –> salt + water (this is a type of double replacement reaction)

Answer 11

Neutralization Reaction

Question 12

What kind of reaction is this? C₁₀H₈ + 12O₂ –> 10CO₂ + 4H₂O

Answer 12

Combustion Reaction