Quiz 20 Flashcards
- A liquid having a higher vapor pressure will have ________.
higher molecular weight
lower boiling point
higher boiling point
higher surface area
lower boiling point
- Which of the following properties indicates very strong intermolecular forces in liquids?
very low surface tension
very low critical temperature
very low boiling point
very low vapor pressure
very low vapor pressure
- The two strands of DNA are said to be
oppositely charged
complementary
identical
partners
complementary
- The amino acid sequence of a polypeptide chain comprises the _______ structure of the protein.
primary
secondary
tertiary
quaternary
primary
- An amino acid with a polar R group.
cysteine
phenylalanine
leucine
valine
cysteine
- An amino acid with a basic R group.
alanine
arginine
proline
glutamine
arginine
- An amino acid that is electrically neutral at pH 5.
aspartic acid
histidine
glycine
threonine
threonine
- An amino acid that will move towards the cathode at pH 10.
glutamic acid
tyrosine
alanine
valine
alanine
- A test for the presence of benzene ring in protein.
Biuret
Million’s
Hopkin’s Cole
Xanthoproteic
Xanthoproteic
- Protein presence in bones
collagen
fibroin
elastin
keratin
collagen
- How do you classify liquids that vaporized easily?
ideal liquid
saturated liquid
volatile liquid
osmotic liquid
volatile liquid
- Defines the classification of water resources
DAO 34
DAO 14
DAO 29
DAO 18
DAO 34
- In tubes having very small diameters, liquids are observed to rise or fall relative to the level of the surrounding liquid. What do you call this phenomenon?
fluidity
capillarity
surface tension
viscosity
capillarity
- Which of the following is not an SI unit?
meter
kilogram
angstrom
pasca
angstrom
- In the process of freeze drying, ice goes directly into water vapor. What is the temperature at which this process can take place?
above the triple point of water
any of the above, depending on the pressure
at the triple point of water
below the triple point of water
below the triple point of water
- It is the imaginary envelope which encloses the system and separates it from its surroundings.
boundary
control surface
control volume
interaction
boundary
- The prefix giga is equivalent to
10^6
10^9
10^12
10^18
10^9
- After engaging in a short, intensive burst of exercise, an athlete has
dehydration
electrolytes depletion
more slow-twitch muscle
an oxygen debt
an oxygen debt
- Substances that absorb ultraviolet light and reemit it as a visible light are called
bleaches
optical brighteners
fabric softeners
water softeners
optical brighteners
- “Laughing gas” can be decomposed into two simpler substances, nitrogen and oxygen. Therefore laughing gas
is an intoxicant
is a mixture
cannot be an element
has the formula NO
cannot be an element
- A substance is oxidized if it
gains oxygen atoms
gains hydrogen atoms
gains electrons
all of these
gains oxygen atoms
- The most abundant element on the Earth’ surface is
oxygen
carbon
hydrogen
silicon
oxygen
- As the temperature of the reaction is increased, the rate of the reaction increases because the
reactant molecules collide less frequently
reactant molecules collide less frequently and with greater energy
activation energy is lowered
reactant molecules collide with greater energy
reactant molecules collide with greater energy
- Which of the following will lower the activation for a reaction?
raising the temperature of the reaction
increasing the concentration of reactants
adding a suitable catalyst
all of these
adding a suitable catalyst
- In a series of reactions, what is the rate determining step?
the main reaction involving the major reactant
the slowest reaction
the fastest reaction
the reaction with the highest order
the slowest reaction
