Reactions - 1 Test Review

Match the following terms with the proper definition

• Whole number that is placed in front of an element in a chemical equation

• Coefficient

• Chemical formula in its simplest, reduced form

• Product

• A new substance that is formed

• Empirical Formula

• Chemical equation with the same number of elements in the reactants and products

• Reactant

• Substance consumed in a chemical reaction

• Balanced Equation

Which type of reaction is:

H₂ + O₂ → H₂O

• Synthesis

• Decomposition

• Single Displacement

• Double Displacement

What type of reaction occurs between an element and a compound?

Ex: Zn + 2HCl --> ZnCl₂ + H₂

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

What kind of reaction is this:
2H₂O₂ →2 H₂O + O₂

• Synthesis
• Decomposition
• Single Replacement 
• Combustion

Answer explanation

Compounds break down 

into simpler substances.

Ex: AB --> A + B

What kind of reaction is this:
2C₃H₇OH +9O₂ -> 6CO₂ + 8H₂O

• Double Replacement
• Combustion
• Single Replacement
• Decomposition

Answer explanation

Reactants: A hydrocarbon and oxygen

Products: water and carbon dioxide

The reaction below is an example of?
AgNO₃ + NaCl → AgCl + NaNO₃

• Single Replacement

• Double Replacement

• Decomposition

• Combustion

Answer explanation

Reactants: 2 compounds

Products: 2 new compounds

(a.k.a. ion swap)

Ex: AB + CD --> AD + CB

An element and a different element react to form one product- this is an example of which type of chemical reaction? 

• combustion
• decomposition 
• synthesis 
• single replacement

Answer explanation

Ex: A + B --> AB

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

• double replacement 
• decomposition 
• combustion 
• single replacement

Answer explanation

Reactants: A hydrocarbon and oxygen

Products: water and carbon dioxide

In a combustion reaction, one of the reactants is ____.

• carbon

• oxygen

• hydrogen

• nitrogen

Answer explanation

You need OXYGEN to combust (or burn).

Calculate the Percentage of Hydrogen in H₂O₂. If the molar mass of H₂O₂ is 34.02 g/mol

• 5.93 %

• 5.94 %

• 94 %

• 94.01 %