CHEMICAL REACTIONS

What is the number placed below an element’s symbol in a chemical formula called?

The substances listed on the left side of a chemical equation are the

Which two processes could be considered opposites?

• decomposition and double replacement
• double replacement and substitution
• substitution and synthesis
• synthesis and decomposition

In a chemical reaction, a hydrocarbon compound reacts with the diatomic element oxygen. What type of reaction is this?

Type of reaction where two or more simple substances combine to form a more complex substance.

What evidence would tell that a chemical reaction has taken place?

In this reaction, a more active element replaces active element in the compound.

Is the following reaction a synthesis, decomposition, single replacement or combustion reaction? C₁₀H₈ + O₂ → CO₂ + H₂O

What would the reverse of decomposition reaction be called?

What type of reaction is FeS + HCl → FeCl₂ + H₂S?