Chemical Reaction Middle School Chemical Change

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

• combustion
• decomposition 
• synthesis 
• single replacement

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

• double replacement 
• decomposition 
• combustion 
• single replacement

Tags

NGSS.MS-PS1-5

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

• combustion 
• synthesis 
• decomposition 
• single replacement 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A metal is reacted with an acid to produce a salt and a hydrogen gas. What type of reaction has occurred? 

• neutralization 
• double replacement 
• single replacement 
• synthesis 

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction is illustrated below?
2HI --> H₂  +  I₂

• synthesis
• decomposition
• single replacement
• double replacement

What type of reaction is illustrated below?

Zn + H₂S --> ZnS + H₂

• synthesis

• decomposition

• single replacement

• double replacement

Tags

NGSS.MS-PS1-2

Which of these is NOT a sign that a chemical change has occurred? 

• Change in shape.
• An unexpected color change
• A temperature change
• The formation of a precipitate

Tags

NGSS.MS-PS1-2

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2 NH₃+ 1 H₂SO₄ ----> 1 (NH₄)₂SO₄

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement