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

• aqueous 
• precipitate
• acid
• synthesis 

Tags

NGSS.MS-PS1-2

Which of the following compounds will not disassociate in water? 

• NaCl
• PbCl₂
• MgNO₃
• Na₂SO₄

Tags

NGSS.HS-ESS2-5

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

A chemical reaction that shows the formation of a solid and identifies the spectator ions

• net ionic equation 
• double replacement 
• ionic equation 
• dissociation 

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

• coefficient 
• superscript 
• subscript 
• SI unit 

Tags

NGSS.MS-PS1-1

The word oxidation describes 

• gain of electrons
• loss of electrons 
• number of electrons remains the same
• number of electrons transfered

The word reduction describes 

• gain of electrons 
• loss of electrons 
• number of electrons remains the same
• transfer of electrons

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