chemical bonding

Question 1

Ionic bonding

Answer 1

attraction between oppositely charged ions

Question 2

Covalent bonding

Answer 2

formed when atoms share a pair of electrons

Question 3

Pure covalent bond

Answer 3

occurs when electrons are shared equally

Question 4

polar covalent bond

Answer 4

occurs when electrons are not shared equally

Question 5

Electronegativity

Answer 5

of an element is a measure of the attraction of an atom of that element for a shared pair of electrons in a covalent bond

Question 6

trends in EN

Answer 6

Increase across a period due to decreasing atomic radius
Decreasing down a group due to increasing atomic radius

Question 7

Properties of ionic compounds

Answer 7

Ionic compounds usually form a crystalline solid because of the oppositely charged ions
The positive end of one molecule is attracted to the negative end of an adjacent molecule forming a regular solid and repeating structure known as a crystal lattice

Question 8

ionic properties summary

Answer 8

form crystalline solids
have a high melting and boiling point of water
conduct electricity when molten or when dissolved in water
soluble in water
have fast reactions

Question 9

covalent properties

Answer 9

usually in liquid or gas form
low melting and boiling point
do not conduct electricity
insoluble in water
slow reactions