Question

1. read and match the types of reactions with the descriptions

when a substance reacts with oxygen to create energy in the form of heat or light
when one substance breaks down into two or more substances
when the cations of one compound replaces the cations of another compound to form two
newly ionic compounds
when two or more substances combine to form a new compound
when one element is replaced by another element in a compound
types of
reactions

1. decomposition reaction
2. combination reaction
3. single - replacement reaction
4. double - replacement reaction
5. combustion reaction

Explanation:

1. Combustion reaction: Defined as a substance reacting with oxygen to release heat/light energy.
2. Decomposition reaction: Defined as a single substance breaking down into multiple simpler substances.
3. Double replacement reaction: Defined as cations (or positive ions) of two compounds swapping places to form new compounds.
4. Synthesis reaction: Defined as multiple substances combining to form a single new compound.
5. Single replacement reaction: Defined as one element being replaced by another element within a compound.

Answer:

• when a substance reacts with oxygen to create energy in the form of heat or light → combustion reaction
• when one substance breaks down into two or more substances → decomposition reaction
• when the cations of one compound replace the cations of another compound to form two entirely new compounds → double replacement reaction
• when two or more substances combine to form a new compound → synthesis reaction
• when one element is replaced by another element in a compound → single replacement reaction