Chemical Bonding (topic 4)

Question 1

What does BARF stand for?

Answer 1

Break a bond by Absorbing energy, Release energy when you Form a bond.

Question 2

Which two atoms full shells only contain 2 valence electrons?

Answer 2

Hydrogen and Helium.

Question 3

What rule do bonds between atoms work to achieve?

Answer 3

The octet rule.

Question 4

What three things will atoms do with electrons to achieve a full outer shell?

Answer 4

Lose, gain, or share electrons.

Question 5

You cannot have a single metallic bond. True or false?

Answer 5

True

Question 6

In metallic bonds what happens to the electrons?

Answer 6

They move all around the metal, sea of electrons.

Question 7

Examples of a metallic crystal.

Answer 7

Copper, silver, gold, brass

Question 8

What metals are metallic substances made from?

Answer 8

Transition metals

Question 9

Metallic substances have low melting and boiling points. True or false?

Answer 9

False

Question 10

How do Ionic bonds form? What to they result in?

Answer 10

When a metal transfers own or more electrons to a non metal. This results in an ion.

Question 11

Where do ion-ion electrostatic forces occur?

Answer 11

Ionic compounds.

Question 12

Which structure is a part of ionic bonding?

Answer 12

Crystal lattice

Question 13

Example of crystal lattice.

Answer 13

Salt crystals.

Question 14

Ionic substances are conductors in a solid state. True or false?

Answer 14

False

Question 15

Ionic substances are good conductors in solutions. True or false?

Answer 15

True

Question 16

Do ionic substances have high melting and boiling points? If so why?

Answer 16

Yes, because of ion-ion forces.

Question 17

Ionic substances dissolve is polar substances. True or false?

Answer 17

True (water is polar and salt is ionic)

Question 18

How do covalent bonds form? What has to be the electronegativity difference?

Answer 18

Formed when to non metals share electrons. Electronegativity difference has to be less than 2.0.

Question 19

What is a coordinate covalent bond ?

Answer 19

A covalent bond that forms when both electrons come from the same atom.

Question 20

What is a non polar bond?

Answer 20

A bond with equal sharing of electrons due to atoms participating in the bond, having the same electronegativities.

Question 21

What is a polar bond?

Answer 21

A polar bond is the unequal sharing of electrons due to the atoms in the bond, having a different electronegativity from each other.

Question 22

What does NASL stand for?

Answer 22

Needed
Available
Shared
Lone

Question 23

How do you use NASL?

Answer 23

Needed (2 for He+H, 8 for most others)

Available (add up valence electrons)

Shared (needed-available, this # divided by 2 tells you the number of bonds.)

Lone (Available-shared)

Question 24

How many bonds are made from one element being in group 14?

Answer 24

4

Question 25

How many bonds are made from one element being in group 15?

Answer 25

3

Question 26

How many bonds are made from one element being in group 16?

Answer 26

2

Question 27

How many bonds are made from one element being in group 17?

Answer 27

1

Question 28

How many bonds are made from one element being in group 18?

Answer 28

0

Question 29

What are the three ways to tell if a molecule is non polar?

Answer 29

1.Symmetrical 2. Hydrocarbon (made of just hydrogen and carbon) 3. One of the 7 diatomics

Question 30

What are the three ways to tell if a molecule is polar?

Answer 30

1. Asymmetrical 2. H-F, H-N, or H-O bonds are present 3. Lone electrons pairs on the central atom.

Question 31

What does SNAP stand for?

Answer 31

Symmetrical means Nonpolar molecule, Asymmetrical means Polar molecule.

Question 32

Is H2O/water always polar or nonpolar?

Answer 32

Polar

Question 33

What is the structure of a molecule H2O/ water?

Answer 33

Bent

Question 34

What type of bond does dipole dipole intermolecular forces occur between?

Answer 34

Polar covalent

Question 35

In dipole dipole intermolecular forces the partial positive side of the molecules attracted to the partial negative side of a different molecule. True or false?

Answer 35

True

Question 36

Do intermolecular forces, connect atoms or molecules?

Answer 36

Molecules

Question 37

Where does hydrogen bonding occur?

Answer 37

Between molecules where a hydrogen is bonded to either an oxygen, nitrogen , or fluorine.

Question 38

In hydrogen bonding, does the hydrogen have the partially positive or the partially negative end?

Answer 38

Partially positive

Question 39

What type of intermolecular force occurs between all types of molecules?

Answer 39

LDF, london dispersion forces, Van Der Wall forces.

Question 40

What two types of intermolecular forces only occur between polar molecules?

Answer 40

Dipole dipole forces, and hydrogen bonding.

Question 41

What is the weakest type of intermolecular force?

Answer 41

LDF, london dispersion forces, Van Der Wall forces.

Question 42

The stronger, the intermolecular force, the lower, the melting and boiling points. True or false?

Answer 42

False

Question 43

What is a network solid?

Answer 43

A network solid is covalent bonds in a continuous network.

Question 44

Example of a network solid

Answer 44

Diamond, graphite, quartz

Question 45

What theory is used to name covalent molecules structure?

Answer 45

The VESPER theory

Question 46

What does VESPER in VESPER theory stand for?

Answer 46

Valence shell electron pair repulsion.

Question 47

Out of metallic, ionic, and covalent molecules which molecule is the only one that is soft?

Answer 47

Covalent

Question 48

What are the four types of structures in covalent molecules?

Answer 48

Linear, bent, trigonal pyramidal, and tetrahedral.

Question 49

Do covalent molecules have strong or weak intermolecular forces?

Answer 49

Weak

Question 50

What is the true definition of a chemical bond?

Answer 50

The forces that hold atoms together within a compound that’s goal is to have a full valance shell of electrons.