6.2 reading guide

In a ______________ reaction, two or more substances combine to form a new compound.

• synthesis

• decomposition

• single replacement

• combustion

______________ reactions break down a compound into simpler substances.

• Decomposition

• Combination

• Displacement

• Neutralization

In a combustion reaction, a substance reacts with ______________ to release energy.

• oxygen

• hydrogen

• carbon dioxide

• nitrogen

In a ____________ reaction, one element takes the place of another in a compound.

• single displacement

• double displacement

• synthesis

• decomposition

In a __________ reaction, ions appear to be exchanged between compounds.

• single displacement

• double displacement

• combustion

• oxidation-reduction

A radical is ______ and it is so reactive because ______.

• a molecule with an extra proton; it is unstable

• an atom or molecule with an unpaired electron; it seeks to pair its electron

• a molecule with a double bond; it is highly energetic

• an ion with a negative charge; it attracts positive ions

Predict the products of this reaction: The decomposition of CaCO₃. What type of reaction is this?

• CaO and CO₂; Decomposition reaction

• Ca and CO₃; Synthesis reaction

• CaCO and O₂; Redox reaction

• CaO₂ and CO; Displacement reaction

The transfer of electrons in a redox reaction differs from the sharing of electrons in a covalent bond in which of the following ways?

• Electrons are transferred in redox reactions, while they are shared in covalent bonds.

• Electrons are shared in redox reactions, while they are transferred in covalent bonds.

• Both involve only the sharing of electrons.

• Both involve only the transfer of electrons.