types of chemical reaction

Question 1

Synthesis (Combination):

Answer 1

Two or more substances combine to form a single compound.

E.g. hydrogen and oxygen combine to form water

Question 2

Decomposition:

Answer 2

A compound breaks down into simpler substances.
water breaking into hydrogen and oxygen

Question 3

single displacement

Answer 3

One element replaces another in a compound.

Example: (zinc replaces hydrogen in hydrochloric acid).

Question 4

double displacement

Answer 4

Two compounds swap components to form two new compounds.

Example: (sodium chloride and silver nitrate exchange ions).

Question 5

combustion

Answer 5

A substance reacts with oxygen, producing heat and light, often resulting in carbon dioxide (CO₂) and water (H₂O).

Example: (methane burning in oxygen).

Question 6

neutralization

Answer 6

An acid reacts with a base to form water and a salt.

Question 7

define combustion

Answer 7

Combustion specifically is one of the most energy-releasing reactions, often powering vehicles, heating homes, and lighting candles. Combustion is a chemical reaction where a substance (called a fuel) reacts with oxygen to release energy in the form of heat and light. This reaction usually produces carbon dioxide (CO₂) and water (H₂O) as the main products, depending on the fuel used.

Question 8

reactants

Answer 8

Reactants are the original substance in a chemical reaction.

Bonds between atoms in the reactants are broken.

Question 9

what does the arrow mean in chemical reactions

Answer 9

reacts to form