Chemical Reaction Unit Test

Identify all factors to help a chemist recognize that a chemical reaction had occurred. There may be more than 1 answer to this question.

• Change in temperature

• Solid dissolves in solution

• Combustion occurred

• Change in color

• Formation of bubbles

Write the following reaction in a chemical equation:

A gas stove is lit due to a reaction between methane (CH₄) and oxygen (O₂). The reaction releases carbon dioxide (CO₂) and water (H₂O).

Tags

NGSS.HS-PS1-4

The chemical reaction in an alkaline battery can be represented by the following chemical equation:

Zn + 2MnO₂ + H₂O ---> ZnO + 2MnOOH

What are the reactant(s) for this experiment?

• Zn

• 2MnO₂

• H₂O

• 2MnOOH

• ZnO

An element plus additional element reacts to form one product is an example of which type of chemical reaction? 

• combustion
• decomposition 
• synthesis 
• single replacement

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

• combustion 
• synthesis 
• decomposition 
• single replacement 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Increasing the temperature of a chemical solution will.......

• increase the kinetic energy of the molecules in the solution

• decrease the kinetic energy of the molecules in the solution

• not change the kinetic energy of the molecules in the solution

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-2

If the reactant particles collide with more than the activation energy, the particles will be react, and new chemical bonds will be formed.

• True

• False

Tags

NGSS.HS-PS1-4

The chemical reaction in an alkaline battery can be represented by the following chemical equation:

Zn + 2MnO₂ + H₂O ---> ZnO + 2MnOOH

What are the product(s) for this experiment?

• Zn

• 2MnO₂

• H₂O

• 2MnOOH

• ZnO

The chemical reaction to synthesize ammonia from nitrogen and hydrogen can be represented as below. However, the equation is not balanced. Balance the equation by answering the questions below:

N₂ + H₂ ---> NH₃

a. How many N2 molecules is required for this reaction?

b. How many H2 molecules is required for this reaction?

c. How many NH3 compounds will be produced?

Your answer should be clearly stated in three parts.

Tags

NGSS.MS-PS1-5

An acid has a pH

• higher than 7

• lower than 7

• 7

• greater than 14