Bio Chem

Question 1

A molecule

Answer 1

A substance with two or more atoms bonded together (CI2).

Question 2

A compound

Answer 2

A substance consisting of two or more elements in a fixed ratio (NaCI). A compound has emergent properties and characteristics different from those of its elements

Question 3

Energy

Answer 3

Energy is the capacity to cause change.

Question 4

Potential energy

Answer 4

The energy that matter has because of its location or structure.

Question 5

Energy levels

Answer 5

An electrons state of potential energy is called it’s energy levels or electron shell. The energy level of each shell increases with distance from the nucleus.

Question 6

Valence electrons

Answer 6

Those that occupy the valence shell. The reactivity of an atom arises from the presence of one or more unpaired electrons in the valence shell. Atoms with complete valence shells are unreactive or inert

Question 7

Covalent bonding

Answer 7

• atoms with incomplete valance shells can share or transfer electrons with certain other atoms. This results in atoms staying close together, held by attractions called chemical bonding
• it’s the sharing of a pair of valence electrons by two atoms ( non-metals)
• tow or more atoms held together by valence bonds

Question 8

Electronegativty

Answer 8

An atoms attractions for the electrons in a covalent bond.

The more electronegative an atom the more more strongly it pulls shared electrons towards itself