Endothermic and Exothermic Reactions

Question 1

What is an exothermic reaction?

Answer 1

Energy is released.

Happens when reactants have more energy than products.

Examples: 🎆 Fireworks, 🔥 Bunsen burner.

Question 2

What is an endothermic reaction?

Answer 2

Energy is absorbed.

Happens when reactants have less energy than products.

Example: ❄️ Cold packs.

Question 3

What is combustion?

Answer 3

A chemical reaction where oxygen burns a substance.

Produces light and heat (energy).

Example:
(Hexane burning in oxygen forms carbon dioxide and water.)

Question 4

What is corrosion?

Answer 4

Corrosion is the process by which metals combine with oxygen to produce metal oxides.

Example: Iron + Oxygen + Water = Hydrated iron (III) oxide (rust)

Question 5

What is a decomposition reaction?

Answer 5

A decomposition reaction occurs when a single reactant breaks apart to form multiple products.

Example:
Carbonic acid decomposes into water and carbon dioxide

Question 6

What is thermal decomposition?

Answer 6

Thermal decomposition is a type of decomposition reaction where a reactant breaks down into simpler products when heated.

Example:
Sodium azide decomposes when heated to produce sodium and nitrogen gas

Question 7

What is a Combination Reaction?

Answer 7

When two reactions combine to form a single reaction

Question 8

What is a Precipitation Reaction?

Answer 8

A reaction where 2 soluble reactants form an insoluble product ( precipitate)