How much heat is required to convert solid ice with a mass of
750 g and at a temperature of -26.5 °C to liquid water at a
temperature of 72.0 °C? (The specific heat of ice is cice = 2100
J/kgK, the specific heat of water is cwater = 4186.8 J/kgK, and the
heat of fusion for water is: Lf = 334 kJ/kg.)
How much heat is required to convert solid ice with a mass of
605 g and at a temperature of -12.5 °C to liquid water at a
temperature of 55.5 °C? (The specific heat of ice is
cice = 2100 J/kgK, the specific heat of water is
cwater = 4186.8 J/kgK, and the heat of fusion for water
is: Lf = 334 kJ/kg.)
For each of the following nonbiological processes, state
whether you think it is analogous to physiological positive
feedback, negative feedback, or neither of these, and justify each
answer: (a) the cruise control of a car maintaining a preset
highway speed; (b) a flushed toilet tank refilling to its original
resting level; (c) a magnifying glass focusing the sun’s rays and
catching a piece of paper on fire; (d) a house fire in which heat
from the flames ignites adjacent flammable...
Pre-Lab ( LACTOSE)
1. What does heat and/or acid do to proteins like casein?
2. What is the purpose of adding calcium carbonate after removal
of the casein?
3. Explain the purpose and function of the addition of ethanol
to the aqueous solution.
4. Draw the structure of lactose. Is it a mono-, di-, oligo-, or
polysaccharide?
5. If lactose were hydrolyzed (broken apart into its component
sugars) what sugars would be isolated?
a) At what distance from a 2 solar mass neutron star would a
planet like the Earth be tidally disrupted (that is, literally
pulled apart)? That is, how close would the planet need to be to
the NS for the difference between the NS’s gravity at the center of
the planet and at the surface of the planet to be greater than the
gravity holding the planet together?
b) Would the asteroid Pallas be able to get any closer? (Pallas...
HEAT TRANSFER: HEAT EXCHANGER
Oil flows in a heat exchanger with a mass flow rate of 20 kg/s
and is to be cooled from 175 to 65°C with water as a coolant
flowing at a rate of 30 kg/s and an inlet temperature of 12°C. The
overall heat transfer coefficient is U = 1250
W/m2⋅K.
a) Sketch the temperature profile and calculate the mean
temperature for parallel flow, counter flow, and cross flow heat
exchangers..
b) Determine the area required...
Know what is meant by entropy and how certain processes are
irreversible (e.g. heat flow into the environment, many phase
changes, mixing of two substances initially separated) lead to
changes in entropy while certain ideal cyclic processes not.
Know the relationship between reversible and irreversible
processes and how to recognize whether a process is reversible or
not. Please give an example of each
the specific heat of copper (0.092) and the specific
heat of silver is (0.056). The mass of silver is 1.02 times greater
than the mass of the copper. The heat gained by the silver is 1.33
times the heat gained by copper. The temperature change of copper
is 20 degrees Celsius. What is the temperature change of the
silver?
What is the indirect evidence of evolution? What are
homologous and analogous structures? What is convergent evolution?
How does similarity of proteins between different species support
the idea of evolution?