Reaction Review

The reaction Pb(NO₃)₂ + 2KI --> PbI₂ + 2KNO₃ is a

• synthesis reaction.

• decomposition reaction.

• double-replacement reaction.

• combustion reaction.

The reaction 2HgO --> 2Hg + O₂ is a(n)

• ionic reaction.

• single-replacement reaction.

• decomposition reaction.

• synthesis reaction.

The reaction Mg + 2HCl --> H₂ + MgCl₂ is a

• composition reaction.

• decomposition reaction.

• single-replacement reaction.

• double-replacement reaction.

The reaction 2Mg + O₂ --> 2MgO is a

• single-replacement reaction.

• double-replacement reaction.

• decomposition reaction.

• synthesis reaction.

Which equation is balanced?

• 2H₂ + O₂ --> H₂O

• H₂ + O₂ --> 2H₂O

• 2H₂ + O₂ --> 2H₂O

• 3H₂ + 2O₂ --> 4H₂O

Tags

NGSS.HS-PS1-7

What is significant about the following seven elements: Hydrogen, Oxygen, Fluorine, Bromine, Iodine, Nitrogen, and Chlorine?

• All have 7 valence electrons
• They are all diatomic in nature when uncombined with other elements
• Each of those elements were discovered during the 1930’s
• All of them have been used as experimental sources of fuel

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

According to the law of conservation of mass, the total mass of the reacting substances is

• always more than the total mass of the products.
• always less than the total mass of the products.
• always equal to the total mass of the products.
• sometimes more and sometimes less than the total mass of the products.

Tags

NGSS.HS-PS1-7

In the equation 2Al + 3Fe(NO₃)₂ --> 3Fe + 2Al(NO₃)₃ , iron has been replaced by

• water.

• nitrogen.

• aluminum.

• nitrate.

In a double-replacement reaction, hydrogen chloride (HCl) and sodium hydroxide (NaOH) react to produce sodium chloride (NaCl). Another product is

• potassium chloride.
• hydrogen gas.
• sodium hydride.
• water.

MgBr₂ + Cl₂ -->

• MgBrCl.

• MgCl₂ + Br₂.

• Mg + BrCl.

• MgCl + Br₂.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2