Unit 5 Chemical Reactions Test rev 2026

In this equation, which are the reactant(s)? Mg(s) + O₂(g) --> MgO(s)

• Mg(s)

• O₂(g)

• Mg(s) + O₂(g)

• MgO(s)

Tags

NGSS.HS-PS1-7

Which type of chemical reaction is shown?

• double replacement

• combustion

• synthesis

• decomposition

Which is the name of the kind of solid substance formed in the picture?

• aqueous

• precipitate

• coordinate complex

• decomposition

Which type of reaction can be recognized by the general pattern

A + BX --> AX + B ?

• combustion

• synthesis

• single replacement

• decomposition

What is the correct description of this reaction? 

Cu(s) + 2HCl(aq) →  CuCl₂(aq) + H₂(g)

• Hydrogen gas reacts with a solution of copper chloride to produce solid copper metal in a solution of hydrochloric acid.

• A solution of copper metal reacts with solid hydrochloric acid to produce a solution of copper chloride and hydrogen gas

• Hydrogen gas reacts with solid copper chloride to produce solid copper metal in a solution of hydrochloric acid.

• Solid copper reacts with a solution of hydrochloric acid to produce a solution of copper chloride and hydrogen gas.

Which of these chemical equations correctly represents the reaction: solid copper metal, Cu, reacts with a solution of silver nitrate, AgNO₃, to produce a solution of copper nitrate, Cu(NO₃)₂, and silver metal, Ag?

• 2Ag(s) + Cu(NO3)2(l) → 2AgNO3(l) + Cu(s)

• 2Ag(s) + Cu(NO3)2(aq) → 2AgNO3(aq) + Cu(s)

• 2AgNO3(l) + Cu(s) → 2Ag (s) + Cu(NO3)2(l)

• 2AgNO3(aq) + Cu(s) →  2Ag(s) + Cu(NO3)2(aq)

When the chemical equation below is correctly balanced, what coefficient is placed in front of water?

C₂H₆(g) + O₂(g) →  CO₂(g) + H₂O(g)

• 3

• 4

• 6

• 12

What are the correct coefficients when this equation is balanced?

Sb  +  O₂  → Sb₄O₆ 

• 1, 2, 10

• 4, 6, 1

• 4, 3, 1

• 10, 5, 1

Which are the product(s) of this chemical reaction?  

FeCl₃  +  NH₄OH  →

• Fe(OH)3 +  NH4Cl

• NH4Fe + Cl3OH

• NCl3 + FeOH5

• FeCl3 + NOH4

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which type of chemical reaction would this be classified as:  

C₃H₈  +  O₂  →  CO₂  + H₂O

• synthesis

• double replacement

• combustion

• decomposition