Exam 1 Flashcards
(25 cards)
What is the fundamental difference between covalent and ionic bonding?
In a covalent bond, the partners share a pair of electrons, in an ionic bond, one partner accepts electrons from the other
A neutral atom of boron has an atomic number of 5 and an atomic mass of 11. How many electrons does boron have?
5
Typically, nitrogen atoms are composed of electrons, protons and neutrons. As isotope of nitrogen could..?
Have more neutrons than the usual nitrogen atom
What happens to an atom if the electrons in the outer shell are altered?
The charge of atom changes
Table salt if formed when..?
Sodium donates its single outer elctron to chlorine
In a water molecule, hydrogen and oxygen are held together by a _ bond?
polar covalent
The hydrogen atom of a water molecule are bonded to the oxygen atom by _ bonds, whereas neighboring water molecules are held together by _bonds
polar covalent, hydrogen
Which of the following statements about the pH is true?
Increase on hydrogen ion concentration means decrease in pH scale units
A buffer..?
Donates H+ ions when conditions because too basic and accepts h+ ions when conditions become too acidic
Propanol and isopropanol are isomers. this means they have?
The same molecular formula but different chemical properties
The results of dehydration reactions can be reversed by…?
Hydrolysis reactions
The molecular formula of most monosaccharides represnts a multiple of…?
CH2O
Sucrose is formed..?
From two monosaccharides through dehydration reactions
Which of the following list only contain polysaccharides?
Cellulose, starch, glycogen
Cellulose differs from starch in that..?
Most animals cannot breakdown cellulose, whereas starch is easily digested
The storage form of carbohydrates is_ in animals and _ in plants?
Glycogen and starch
Fatty acids are..?
Composed of hydrocarbon chains and a carboxylic acid group
Amino acids can be distinguished from one another by..?
The type of bond between the R group and the rest of the amino acid molecules
Peptide bonds..?
Link amino acids
The tertiary structure of a polypeptide refers to..?
The overall three- dimensional structure
Carbon-14 has the same?
Number of protons but more neutrons than carbon-12
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a molecular made by linking three glucose molecules together by dehydration reactions?
C18H32O16
How do phospholipids interact with water molecules?
Polar heads interact with water, the nonpolar tails do not.
A tripeptide has _?
Three amino acids and two peptide bonds
