2- Structures, properties and uses

Question 0

Ionic bonding?

Answer 0

metallic and a non metallic atoms that give (metal) and receive (non metal) electrons

Question 1

Covalent bonding?

Answer 1

non-metallic atoms that share electrons

Question 2

Ion?

Answer 2

Charged particles

Question 3

Molecule?

Answer 3

A compound who’s atoms are covalently bonded

Question 4

Metallic bond?

Answer 4

metallic atoms
loose all electrons on outer shell (become delocalised)
Bond because the positive atoms are held together by the strong attraction of the delocalised negative electrons holding the structure together

Question 5

Delocalised electron?

Answer 5

Bonding electron that is no longer associated with a particular atom

Question 6

What do carbon atoms form?

Answer 6

4 strong covalent bonds

Question 7

When an electron is lost?

Answer 7

Becomes positive

Question 8

When an electron is gained?

Answer 8

Becomes negative

Question 9

What mass does each particle have? (P,N,E)

Answer 9

Protons- 1
Neutrons- 1
Electrons- negligible mass

Question 10

What are isotopes?

Answer 10

An element with a different number of neutrons than normal, giving it a different relative atomic mass

Question 11

How does melting and evaporating substances happen?

Answer 11

Using energy to break or lower the forces of attraction

Question 12

What are intermolecular forces?

Answer 12

Weak forces of attraction between molecules (forces of repulsion)

Question 13

What are intramolecular forces?

Answer 13

Strong forces of attraction holding together the atoms making up molecules or compounds

Question 14

Why do simple covalent molecules have a low boiling point?

Answer 14

They have weak intermolecular forces which are easy to overcome using energy (does not break the covalent bond)

Question 15

Why do ionic compounds have a high boiling point?

Answer 15

They have strong electrostatic charges and there are many atoms

Question 16

What is nano science’s advantages and disadvantages?

Answer 16

Ad: can be used for unique things such as very efficient catalysts and new cosmetics and medically
Dis: if they are used to much, there is a theory that they could get into the air and our bodies and cause environmental or health issues

Question 17

What are two key need to knows about nano particles?

Answer 17

They are one billionth of a metre

They have a large surface area to volume ratio (big surface area)