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Alejandro Falsiroli`s Ch.6 and Ch.7 Flashcards
Alejandro Falsiroli`s Ch.6 and Ch.7 Flashcards
20
Chemistry
8th Grade
01/30/2010

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Cards

Term

Describe an electron dot diagram.

Definition

An electron dot diagram is a model of an atom in which

each dot represents a valence electron.

 

 

 

 

Term

By losing one valence electron, a sodium atom achieves the same electron arrangement as an atom of _____

Definition

Neon.

Term

An ionic bond forms when _____ are transferred from one atom to another.

Definition
Electrons.
Term

Is the following sentence true or false? The lower the ionization energy, the easier it is to remove an electron from an atom.

Definition
True.
Term

Identify two factors that determine the arrangement of ions in an ionic crystal.

Definition
The ratio of ions, The relative sizes of the ions.
Term

Is the following sentence true or false? In a covalent bond, the atoms are held together by the attractions between the shared electrons and the protons in each nucleus.

Definition
True.
Term

In general, elements at the _____ of a group have a greater attraction for electrons than elements at the ____ of a group have.

Definition
Top, Bottom.
Term

In a hydrogen chloride molecule, the ____ shared electrons spend more time near the ____ atom than near the atom.

Definition
Clorine, Hydrogen.
Term

Describe a polar covalent bond.

Definition

A polar covalent bond is a covalent bond in which electrons are not shared equally.

Term

When atoms form a polar covalent bond, the atom with the greater attraction for electrons has a partial ____ charge.

Definition
Negative.
Term

 Is the following sentence true or false? The new substances formed as a result of a chemical reaction are called products.

Definition
True.
Term

 Is the following sentence true or false? A chemical equation must be balanced in order to show that mass is conserved during a reaction.

Definition
True.
Term

Is the following sentence true or false? Because the equation N2H4 ! O2hN2 ! H2O has two nitrogen atoms on each side, the equation is balanced.

Definition
False.
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

Is the following sentence true or false? When calcium reacts with oxygen, each calcium atom gains two electrons and becomes a calcium ion with a charge of 2–.

Definition

 False.

Term

Is the following sentence true or false? Oxygen must be present in order for an oxidation-reduction reaction to take place.

Definition
False.
Term

The process in which an element gains electrons during a chemical reaction is called _____.

Definition
Reduction.
Term

What is chemical energy?

Definition

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

Term

Chemical reactions involve the breaking of chemical bonds in the reactants and the formation of chemical bonds in the _____.

Definition
Products.
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