BIO1011 Flashcards
The bonds in water are primarily ____ and ____
Polar covalent and hydrogen
Fluorine atoms tend to take electrons from any atoms that come near. As a result, fluorine atoms _____
tend to form ionic bonds
Hydrogen bonding is most often seen _____
when hydrogen is covalently bonded to an electronegative atom
A polar covalent bond is a bond that ____
has shared electrons pulled closer to the more electronegative atom
Covalent bonds…
are the strongest between atoms of the lightest elements
Life on Earth is dependent on all the properties of water as well as the abundance of water. Which property of water is probably the most important for the functioning of organisms at the molecular level?
versatility as a solvent
An ionic bond involves _____
an attraction between ions of opposite charge
A(n) _____ refers to two or more atoms held together by covalent bonds.
molecule
Atoms with the same number of protons but with different electrical charges _____
are different ions
When the proton number and electron number are unequal, the atom or molecule _____
is an ion
What does the energy to vaporize water do?
breaks hydrogen bonds between water molecules
An ionic bond is formed when _____
one atom transfers an electron to another atom
How an atom behaves when it comes into contact with other atoms is based on their _____
electron configuration
What do the four elements most abundant in life - carbon, oxygen, hydrogen and nitrogen - have in common?
They are all relatively light elements and can exist singly or in combination with other atoms as a gas
A covalent bond is likely to be polar if _____
one of the atoms sharing electrons is much more electronegative
