reactions

What reaction type is characterized by the reactant breaking down as the reaction progresses?

• Synthesis
• Decomposition
• Combustion
• Double Replacement

What is the term for the → sign in a reaction?

• makes
• produces
• yields
• all are correct

Which set of coefficients properly balances the reaction below?
_Cu + _H₂O →_ CuO₃ + _H₂

• 1,3,1,5
• 2,6,2,6
• 1,3,1,3
• 1,2,3,4

Tags

NGSS.MS-PS1-5

What is the coefficient of silver nitrate in this reaction?

_AgNO₃ + _H₂S →_Ag₂S+_HNO₃

• 1

• 2

• 3

• 4

What type of reaction is displayed below?
HCl + NaOH → NaCl + H₂O

• Neutralization
• Combustion
• Double Replacement
• Decomposition

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

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

• aqueous 
• precipitate
• acid
• synthesis 

Tags

NGSS.MS-PS1-2

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

Provides evidence that a chemical reaction has occurred. 

• dissolving 
• melting
• formation of a gas
• bending

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5