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

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

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

a.The ratio of ions 

b.The relative sizes of the ions

Describe a covalent bond.

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

Describe a polar covalent bond.

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

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

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

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

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

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

An aluminum-magnesium alloy

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

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

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

Name five general types of chemical reactions.

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

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.

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

During a chemical reaction, energy is either released or

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

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

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

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

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