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Mauricio's CHAPTER 6 AND 7 FLASHCARDSS
CHAPTER 6 AND 7
19
Chemistry
8th Grade
01/31/2010

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Cards

Term

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

Definition
6
Term

Describe a covalent bond. 

Definition

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

Term

 Describe a molecule. 

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

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

Definition
3
Term

Describe a polar covalent bond. 

Definition

 A polar covalent bond is a covalent bond in which electrons

are not shared equally

Term

What information is provided by the formula for an ionic

compound? 

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

What is a polyatomic ion? 

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

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

Definition

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

number of atoms in a molecule of the compound.

Term

Describe the general rule for naming molecular compounds. 

Definition
The most metallic element appears first in the name.
Term

Name five general types of chemical reactions. 

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

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

and carbon dioxide. 

Definition
CaCOCaO 
Term

What is a double-replacement reaction? 

Definition

A double-replacement reaction is a reaction in

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

Term

What is an oxidation-reduction reaction? 

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

 Calcium reacts with oxygen to form calcium oxide. Which reactant

is oxidized in this reaction?

 

Definition
calcium
Term

What is chemical energy? 

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

What is an exothermic reaction? 

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

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

Definition
The energy term appears on the left side.
Term

What is a reaction rate? 

Definition

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

over time.

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