Chemical Reactions

Question 1

Are phase changes chemical reactions?

Answer 1

No.

Question 2

What are the five types of chemical reactions?

Answer 2

Synthesis
Decomposition
Displacement or Replacement 
Combustion
Oxidation-Reduction

Question 3

What is a synthesis reaction?

Answer 3

When two or more reactants combine to synthesize a single product.

Question 4

What is a decomposition reaction?

Answer 4

When a single reactant breaks down into multiple products (endothermic so 𝚫H > 0 )

Question 5

What are the different types of displacements/replacements

Answer 5

Single = AB + C —> AC + B
Double = AB + CD —> AD + BC
Neutralization = subtype of double.
Acid + Base —> H2O + Salt

Question 6

What is a combustion reaction?

Answer 6

When a compound reacts (burns) in the presence of oxygen. Reactant contains C,H, and O and products are always CO2 and H2O. (Highly exothermic so 𝚫H < 0)

Question 7

What is an Oxidation-Reduction reaction?

Answer 7

It is characterized by electron transfer. A molecule is oxidized when it loses and electron and it is reduced when it gains an electron (OIL-RIG)

Question 8

What does the Conservation of Mass state?

Answer 8

That mass in an isolated system is neither created nor destroyed. This applies to charge as well. (Number of each atoms and charge is same on both sides of reaction)