IB Biology – Water Final Exam Study
Guide.
A chemical bond is formed through - CORRECT ANSWER gaining, losing, or sharing electrons
Ion - CORRECT ANSWER A charged atom which gained or lost electrons
ionic bond - CORRECT ANSWER A chemical bond resulting from the attraction between oppositely
charged ions.
covalent bond - CORRECT ANSWER A chemical bond formed when two or more atoms share electrons
non-polar molecule - CORRECT ANSWER molecule that shares electrons equally and does not have
oppositely charged ends
polar molecule - CORRECT ANSWER a molecule in which one side of the molecule is slightly negative and
the opposite side is slightly positive
Oxygen atom - CORRECT ANSWER atomic number - 8 - protons and electrons
mass number - 16
neutrons - 16-8 = 8
Water is important because - CORRECT ANSWER • It allows chemical reactions to occur inside living
organisms
• Ice floats
• Requires a lot of heat to melt (hydrogen bonds)
• Surface tension/cohesion
- most organisms have high water content
Guide.
A chemical bond is formed through - CORRECT ANSWER gaining, losing, or sharing electrons
Ion - CORRECT ANSWER A charged atom which gained or lost electrons
ionic bond - CORRECT ANSWER A chemical bond resulting from the attraction between oppositely
charged ions.
covalent bond - CORRECT ANSWER A chemical bond formed when two or more atoms share electrons
non-polar molecule - CORRECT ANSWER molecule that shares electrons equally and does not have
oppositely charged ends
polar molecule - CORRECT ANSWER a molecule in which one side of the molecule is slightly negative and
the opposite side is slightly positive
Oxygen atom - CORRECT ANSWER atomic number - 8 - protons and electrons
mass number - 16
neutrons - 16-8 = 8
Water is important because - CORRECT ANSWER • It allows chemical reactions to occur inside living
organisms
• Ice floats
• Requires a lot of heat to melt (hydrogen bonds)
• Surface tension/cohesion
- most organisms have high water content
