Chemistry chapter 6

KBr is the formula for an ionic compound. The fact that neighter symbol is followed by a subscript means that there is a ________ratio of ions in the compound

1 to 1

In the name carbon dioxide te prefix of the second word indicates that a molecule or carbon dioxide cotains

2 oxygen molecules

Which statment about metals is true

Alkali metals and alkali earth metals are reactive meaning they combine esily to other elemetns by sharing/ transferring valence electrons

Beryllium and chlorine form a binary ionic compound with a one to two ration of beryllium ions to chloride ions. The formula for the compound is

BeCl2

In a metal lattice, _____ are surrounded by a pool of shared electrons.

Cations

The chemical formula for calcium chloride CaCl2 shows that the compound contains two _______ ions for every _________ ion.

Chlorine, Calcium

Alkali metals alkaline earth metals and aluminum all form ions with positive charges equal to the

Group number

Which of the following groups contain three elements with stable electron configurations?

Helium, xenon, neon

Which phrase best describes a metallic bond

The attraction between a metal cation in a shared pool of electrons.

Which of the following statements correctly describes the substance with the formula KI

There is a one to one ration of potassium ions to iodide ions.

A polar covalent bond forms when_________are not equally shared between atoms.

Two atoms

Which statement vest dewscribes the properties of sodium chloride

a good conductor of electric current and other polar solvents

Typically, atoms gain or lose electrons to achieve

a stable electron configuration

The metallic bonds in a transition metal such as tungsten are stronger than the metallic bonds in an_______metal such as sodium

alkali

In an ionic compound the attractions between cations and________ hold the compound together.

anions

Many metals can be drawn into thin wires without breaking because

cations are still surrounded by electrons when they shift position in the lattice.

To produce stainless steel steelmakes add________to iron

chromium

In its simplest form the alloy brass consists of zinc and

copper

You see a structural formula in which the symbols for elements are connected by a long dash. You can assume that the chemical bonds in the compound are

covalent

When two atoms of the same nonmetal react they ofen form a

diatomic molecule

If there are two long dashes between two atoms in a structural formula, molecules of the compound contain a

double valence bond

In general the more______a metal has the stronger its metallic bonds will be

electrons

In a polar covalent bond

electrons are shared unequally

The formation of an ionic bond ivolves the

electrons being transferred from one atom to another

when cesium and fluorine react they form an ionic compound called cesium

fluoride.

You are given the melting points of hree unknown substances and are asked to predict which one is an ionic compound. You would select the compound with the _______melting point

highest

How does increasing the amount of carbon in steel affect its properties

increases hardness and strength

The ions in solid sodium chloride are arraned in a structure called an______lattive

ionic

The name iron(II) indicates that a compound contains

irion ions with a 2+ charge

Among the elemtns potassium lithium and iron the metallic bonds are likely to be strongest in

iron

ionization energy ncrease from

left to right

Fluorine forms a binary ionic compound with lithium what is the name of this compound

lithium fluoride

Which of the following formulas represents a compound whose molecules contain a triple bond

n=n

Study the electron dot diagrams for lithium fluorine and neon in figure 6-1. Choose the statement that correctly identifies the most stable of the elements.

neon

A______ion is a covalently bonded group of atoms that has a positive or negative charge.

polyatomic

Inthe binary ionic compound potassium bormide the element that forms cations is

potassium

The water molecule h2o is polar because it contains two polar single bonds and

s molecule has a bent shape

Two factors that determine whether a molecule is polar are the types of atoms in the molecule and the _______ of the molecule

shape

An alloy that contains mainly iron and carbon is

steel

Which of the follwing is a typical property of an ionic compound

tendency to shatter when struck

in an electron dot diagram the symbol for an element s used to represent

the nucleus and all other electrons in the atom.

Water has a higher boiling point than expected because of

the strong attraction between polar molecules.

in the comound mgCl2 the subscript indicates that

there are to chloride ions for every magnesium ion.

Metallic bonding issimilar to ionic bonding because

there is attraction between positively charged and negatively charged particles

The elements most likely to form more than one type of ion are the

transition metals

The compound whose formula is SO3 is called sulfur

trioxide

In an electron dot diagram each dot represents a

valence electorn

Because water molecules are polar and carbon dioxide molecules are nonpolar,

water has a higher boiling point than carbon dioxide.

In ionic compounds the sum of the charges of all the cations and anions must add to be

zero