How many sodium ions surround each chloride ion in this three-dimensional structure?


Describe a covalent bond.;

A covalent bond is a chemical bond in which two atoms share a pair of valence electrons.

;Describe a molecule.;

;A molecule is a neutral group of atoms that are joined together by one or more covalent bonds.

How many pairs of electrons must two nitrogen atoms share in order for each atom to have eight valence electrons?


Describe a polar covalent bond.;

;A polar covalent bond is a covalent bond in which electrons

are not shared equally

What information is provided by the formula for an ionic


The formula for an ionic compound describes the ratio of the ions in the compound. The formula indicates which elements the compound contains.

What is a polyatomic ion?;

A polyatomic ion is a covalently bonded group of atoms that has a positive or negative charge and acts as a unit.

What information is provided by the name and formula of a molecular compound?;

The name and formula of a molecular compound describe the type and

number of atoms in a molecule of the compound.

Describe the general rule for naming molecular compounds.;

The most metallic element appears first in the name.

Name five general types of chemical reactions.;

Synthesis, decomposition, single replacement, double replacement, and combustion

Write the equation for the decomposition of calcium carbonate into calcium oxide

and carbon dioxide.;


What is a double-replacement reaction?;

A double-replacement reaction is a reaction in

which two different compounds exchange positive ions and form two new compounds.

What is an oxidation-reduction reaction?;

An oxidation-reduction reaction is a reaction in which electrons are transferred from one reactant to another.

;Calcium reacts with oxygen to form calcium oxide. Which reactant

is oxidized in this reaction?



What is chemical energy?;

Chemical energy is the energy stored in the chemical bonds of a substance.

What is an exothermic reaction?;

An exothermic reaction is a chemical reaction that releases energy to its surroundings.

Where does the energy term appear in the equation for an endothermic reaction?;

The energy term appears on the left side.

What is a reaction rate?;

A reaction rate is the rate at which reactants change into products

over time.

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