Chemical Reactions

Which is the name of the kind of solid substance formed in this figure?  

• aqueous 
• precipitate
• acid
• synthesis 

Tags

NGSS.MS-PS1-2

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

• combustion
• decomposition 
• synthesis 
• single replacement

Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because? 

• Magnesium is higher on the reactivity series then hydrogen
• magnesium is more reactive than hydrogen
• magnesium is able to break the bond between HCl and form MgCl₂
• both b and c are correct

Tags

NGSS.HS-PS1-2

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

• coefficient 
• subscript
• superscript
• SI unit

Tags

NGSS.MS-PS1-5

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-PS1-2

Provides evidence that a chemical reaction has occurred. 

• dissolving 
• melting
• formation of a gas
• bending

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of chemical reaction takes place when fluorine reacts with sodium bromide?

• single replacement 
• double replacement 
• combustion
• synthesis 

Tags

NGSS.HS-PS1-2

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

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

• coefficient 
• superscript 
• subscript 
• SI unit 

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-5