Atomic bonding

Question 1

What are isotopes

Answer 1

Atoms with the same atomic number but different mass numbers

Question 2

Why do isotopes have different masses

Answer 2

They have different numbers of neutrons

Question 3

What is relative atomic mass

Answer 3

The average mass of all isotopes of an element taking abundance into account

Question 4

Why is carbons RAM 12.01

Answer 4

Most atoms are carbon 12 with small amounts of heavier isotopes

Question 5

What is carbon dating used for

Answer 5

Finding the age of dead organisms using carbon 14

Question 6

What is a covalent bond

Answer 6

The electrostatic Attraction between 2 positive nuclei for shared pair of electrons

Question 7

Which elements form covalent bonds

Answer 7

Non metals

Question 8

Why are noble gases unreactive

Answer 8

their outer electron shell is full

Question 9

Why are noble gases unreactive

Answer 9

They already have full outer electron shells

Question 10

What do dot and cross diagrams show

Answer 10

How outer electrons are shared in covalent bonds

Question 11

Which electrons are shown in dot and cross diagrams

Answer 11

Valance (outer shell) electrons only

Question 12

How many outer shells does hydrogen need

Answer 12

2 electrons in its outer shell

Question 13

What does one line represent in a structural formula

Answer 13

One shared pair of electrons (single bond)

Question 14

What is a double bond

Answer 14

Two shared pairs of electrons

Question 15

What is a triple bond

Answer 15

Three shared pair of electrons

Question 16

What is the shape of a 2 atom molecule

Answer 16

linear

Question 17

What is the shape of a 3 atom molecule with single bonds

Answer 17

Angular (bent)

Question 18

What is the shape of a 4 atom molecule

Answer 18

Trigonal pyramidal

Question 19

What is the shape of a 5 atom molecule

Answer 19

Tetrahedral

Question 20

Examples of trigonal pyramidal

Answer 20

Ammonia NH3

Question 21

Why is water angular

Answer 21

Lone pairs repel bonding pairs

Question 22

What are the 2 types of covenant structure

Answer 22

Molecular and network

Question 23

What are covenant molecular substances made of

Answer 23

Small, separate molecules

Question 24

Why do covalent molecular substances have low melting points

Answer 24

Weak forces between molecules

Question 25

Do any covenant molecular substances conduct electricity

Answer 25

No

Question 26

Why is a covalent network structure

Answer 26

Thousands of atoms bonded together

Question 27

Covalent network elements

Answer 27

Boron, silicon and carbon

Question 28

Why do covalent networks have high melting points

Answer 28

Strong covenant bonds throughout the structure

Question 29

Which covalent substance conducts electricity

Answer 29

Graphite

Question 30

What elements form ionic compounds

Answer 30

Metals and non metals

Question 31

What is am ionic lattice

Answer 31

A giant structure of positive and negative ions

Question 32

Why do ionic compounds have high melting points

Answer 32

Strong electrostatic attractions between ions

Question 33

Why do ionic solids not conduct electricity

Answer 33

Ions are fixed in the lattice and can't move

Question 34

When do ionic compounds conduct electricity

Answer 34

When molten or dissolved in water

Question 35

When molten ionic compounds Conduct

Answer 35

Ions are free to move and carry charge

Question 36

How can bonding type be identified

Answer 36

By a conductivity test

Question 37

If it conducts as solid and liquid

Answer 37

Metallic

Question 38

Conducts as only liquid

Answer 38

Ionic

Question 39

Melting point and boiling point very high and doesn't conduct besides graphite

Answer 39

Covalant network

Question 40

Melting point and boiling point low and doesn't conduct

Answer 40

Covalent molecular