Unit 7

Reactants

• the substance(s) that undergo a change during a reaction.

Products

• the substance(s) that are formed during the reaction.

Diatomic Elements

Pure elements that naturally exist as molecules composed of two atoms bonded together.

Law of Conservation of matter

• matter cannot be created or destroyed in a chemical reaction; it can only change forms.

Activity series

• ranking of cations that participate in single-replacement reactions.

Precipitate

• a solid that forms from a solution during a chemical reaction.

Soluble

Will dissolve in water.

Insoluble

Products will not dissolve in water, instead forming a solid precipitate.

Subscript of oxygen

2 in chemical formulas indicates that there are two oxygen atoms present.

coefficient of oxygen

6 indicates there are six separate molecules of diatomic oxygen.

what does aqueous (aq)

Aqueous, meaning a substance is dissolved in water.

Single replacement

• A single-replacement reaction occurs when a metal takes the place of another metal within an ionic compound.

Balance the equation

3:4:1:4

Decomposition

• Decomposition reactions take a large molecule and break it down into two or more smaller ones.

  • Opposite of synthesis.

Synthesis Reactions

• A synthesis reaction occurs when two or more elements or compounds combine to form a single, larger molecule.

Double Displacement Reactions

• In a double displacement reaction, the cations of two ionic compounds will switch places.

Combustion

Combustion is a reaction between a carbon-based fuel and oxygen, producing carbon dioxide and water vapor.

 

Identify the following type of reaction

Combustion

 

Identify the following type of reaction

Synthesis