Science Chapter 6 Questions

Front 1

What holds metal ions together in a metal lattice?

Back 1

The cations in a metal form from a lattice that is hed in place by strong metallic bonds between the cations and the surronding valence electrons.

Front 2

What characteristics of a metallic bond explains some of the properties of metals.

Back 2

The mobility of electrons within a metal lattice explains some of the properties of metals.

Front 3

How can scientist design alloys with specific properties.

Back 3

Scientists can design alloys with specific properties by varying the types and amount of elements in an alloy.

Front 4

Explain why the matallic bonds in some metals are stronger that the bonds in other metals.

Back 4

The more valence electrons an atom can contribute to the shared pool, the stonger the matallic bond will be.

Front 5

How does adding carbon to steel make the steel harder and stonger?

Back 5

The carbon atoms form bonds with neighboring iron atoms. These bonds make the lattice harder and stronger that a lattice that contains only iron.

Front 6

Which elements has a higher melting point, potassium in Group 1A or calcium in Group 1B? Give a reason for your answer.

Back 6

Calcium in Group 1B because it has a higher melting point.

Front 7

Can two different elements form a metallic bond together?

Back 7

Yes

Front 8

What information is provided by the formula for an ionic compound?

Back 8

The formula of an ionic compound descibes the ratio the ions in the compounds.

Front 9

What compound is made from only two elements?

Back 9

Binary

Front 10

When a metal forms more than one ion, the name of the ion contains a Roman numeral to indicate the _______ on the ion.

Back 10

Charge

Front 11

The formula for sodium sulfide is Na2S. The sodium ion has a charge of 1+. What must the charge on the sulfide ion be?

Back 11

0

Front 12

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

Back 12

The name and formula of a molecular compound describes the type and number of atoms in a molecule of the compund.

Front 13

Describe the general rule for naming molecular compunds.

Back 13

The general rule is that the most metallic element appears first in the name.

Front 14

In the formula of a molecular compound, the number of atoms of an element in the molecule is represented by a ________.

Back 14

Subscript

Front 15

What is the metal with the highest melting point?

Back 15

Tungsten

Front 16

The cations in a metal form a lattice. What holds the lattice in place?

Back 16

By strong metallic bonds between cation and the surronding valence electrons.

Front 17

Some of the properties of metals can be explained by the _______ of the electrons within a metal lattice.

Back 17

Mobility

Front 18

Name two important properties of metals that can explained by metallic bonding.

Back 18

Conductivity and Mallebility

Front 19

What percentage of gold in jewelry that is labeled 18-karat gold?

Back 19

75 percent

Front 20

How do the hardness and strength of bronze compare to the hardness and strength of copper alone and tin alone?

Back 20

Because bronze is hard used for many things also brass is softer than bronze makes it easier to form things.

Front 21

Name two factors that scientist can vary to designalloys with specific properties.

Back 21

1.By varying the types
2. amounts of elements in an alloy.

Front 22

When carbon is added to iron, the lattice becomes _____ and ________ than a lattice thaat contains only iron.

Back 22

Harder and Stonger

Front 23

What elements that all types of steel contain.

Back 23

carbon and iron

Front 24

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

Back 24

It bends and dents easily

Front 25

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

Back 25

Aluminium- Magnesium Alloy

Front 26

Describe the type of electron configuration that makes an atom stable and not likey to react.

Back 26

When the highest occupied energy level of an atom is filled with electrons, the atom is stable, and not likely to react.

Front 27

Some elements achieve stable electron configurations through the transfer or _____ between atoms

Back 27

Electrons

Front 28

By losing one valence electron, a sodium atom achieves the sme electron arrangement as an atom of ____.

Back 28

Neon

Front 29

An ion with a negative charge is called a _____.

Back 29

Anion

Front 30

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

Back 30

electrons

Front 31

The formula for magnesium chloride is MgCl2. The charge on the magnesium ion is 2+. What is the charge on each chloride ion. What is the answer?

Back 31

1-

Front 32

The shape of an ionic crytal depends on _______ of _____.

Back 32

Arrangement of ions.

Front 33

Nitrogen has five valence electrons. How many pairs of electrons must two nitrogen atoms share in order for each atm to have eight valence electrons?

Back 33

Three

Front 34

What molecular models that show orbitals of atoms overlapping when a covalent bond forms.

Back 34

Space-Filling

Front 35

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

Back 35

Top..........................Bottom

Front 36

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

Back 36

Chlorine................Hydrogen

Front 37

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

Back 37

Negative

Front 38

Water has a higher boiling pint than carbon dioxide because attractions between polar molecules are _____ than attrctions between nonpolar molecules.

Back 38

Stronger