Chemical Reactions

In which type of reaction does two or more substances combine to form a compound?

• Decomposition

• Single Replacement

• Double Replacement

• Synthesis

A chemical equation is balanced when

• coefficients of the reactants equal the coefficients of the products.

• same number of each kind of atom appears in the reactants and in the products

• products and reactants are the same chemicals

• subscripts of the reactants equal the subscripts of the products.

In the equation Cu+2AgNO3--->2Ag+Cu(NO3)2, Silver has been replaced with

• Water

• Silver

• Copper

• Nitrate

Given the incomplete equation 4Fe+3O2--->2X

Which compound is represented by X?

• FeO

• Fe₂O₃

• Fe₃O₂

• Fe₃O₄

Hydrogen gas is produced when HCL is added to

• Magnesium

• Copper

• Gold

• Potassium

The equation AB---> A+ B is the general equation for

• decomposition

• Single replacement

• double replacement

• synthesis

What is the name for the whole number that appears in front of the chemical formula that balances out the equation?

• subscript

• exponent

• coefficient

• superscript

The reaction Pb(NO3)2+2KCL---->

is which type of reaction?

• Decomposition

• single replacement

• double replacement

• synthesis

The Equation 2K+H2O---->2KOH+H2

is which type of reaction

• Decomposition

• single replacement

• double replacement

• synthesis

Which of the following is a balanced equation for the decomposition of Lead (IV) oxide

• PbO₂ →  Pb + 2O

• PbO₂ →  Pb + O₂

• Pb₂O  → 2Pb + O

• PbO → Pb +  O₂