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Armando's Ch. 6&7 Flashcards
Armando´s Ch. 6&7 Flashcards
20
Chemistry
8th Grade
02/01/2010

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Cards

Term

 True or False. Some elements achieve stable electron configurations through the transfer of electrons between atoms.

Definition
True.
Term
An ion with a negative charge is called a(n)
Definition
Anion
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

a.The ratio of ions 

 

b.The relative sizes of the ions

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 polar covalent bond.

Definition

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

Term

Is the following sentence true or false? In a molecule of a compound, electrons are always shared equally by both atoms.

Definition
False.
Term

When carbon is added to iron, the lattice becomes_______ than a lattice that contains only iron.

Definition
harder and stronger
Term

Explain why pure aluminum is not the best material for the body of a plane.

Definition

Although aluminum is lighter than most metals, it bends and dents too easily

Term

What type of alloy is used to make airplane parts that need to be extremely lightweight?

Definition

An aluminum-magnesium alloy

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

Chemists use a counting unit called a(n)_____ to

measure amounts of a substance because chemical reactions ofteninvolve large numbers of small particles.

Definition
mole
Term

Name five general types of chemical reactions.

Definition

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

Term

Is the following sentence true or false? A combustion reaction is a reaction in which a substance reacts with carbon dioxide, often producing heat and light.

Definition
False.
Term

Calcium reacts with oxygen to form calcium oxide. Which reactant is oxidized in this reaction?

Definition
Calcium.
Term

During a chemical reaction, energy is either released or

Definition
absorbed.
Term

In an exothermic reaction, the difference between the chemical energy of the reactants and the chemical energy of the products equals

Definition
the amount of heat released by the reaction.
Term

Is the following sentence true or false? The rate of any reaction is a constant that does not change when the reaction conditions change.

Definition
False.
Term

What happens when a chemical change does not go to completion?

Definition

A chemical equilibrium is established between the forward and reverse reactions.

Term

Is the following sentence true or false? A change in reaction conditions does not affect a chemical equilibrium.

Definition
False.
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