Chem. 2nd Semester Final

Describes the number of molecules in a compound and is used to balance a chemical reaction. 

• coefficient 
• subscript
• superscript
• SI unit

Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?

• double replacement 
• decomposition 
• combustion 
• single replacement

A compound is reacted and forms two new substances. What type of reaction is this? 

• combustion 
• synthesis 
• decomposition 
• single replacement 

Describes the number of atoms in a compound of each element. 

• coefficient 
• superscript 
• subscript 
• SI unit 

What are the correct coefficients when this equation is balanced?
KClO₃  --> KCl  +  O₂

• 2,2,2
• 2,2,3
• 1,2,3
• 3,3,3

Potassium iodide is a catalyst in a chemical reaction where would this be placed when writing the chemical reaction? 

• product side
• reactant side
• above the arrow
• left out 

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders

A change in the shape of an object is an example of _________________.

• a chemical change

• energy

• an endothermic change

• a physical change

Which of the following is an example of a chemical change?

• rusting of a bicycle
• painting a house
• washing a dog
• tearing up a newspaper

What is the BEST definition of a chemical reaction?

• A change in matter that produces one or more NEW substances

• When two things combine and EXPLODE.