Question

what is the purpose of measuring conductivity and temperature in
determining a reaction type?

Answer #1

Conductivity changes as a product increases or reactant decreases, so we can follow the concentration or extent of reaction if we measure conductivity. This is typically for Titrations (i.e. the molecular HA will form ionic H+ and A- in solution, which make conduciton possible)

The temperature is helpful for those reaciton which are either endothermic or exothermic.

As T increases, if this is exothermic, we can assure the reaction is proceeding in the forward direction

If T decreases, and this is endothermic, the reaction is also going in the forward direction

Therefore, both are excellent types of variables which let us know the type of reaction and extent of reaction

In order to monitor a chemical reaction for the purpose of
determining reaction rates, what practical and creative decision
must a scientist make? What important criteria must this choice
fulfill?

Determination of Thermal Conductivity. In
determining the thermal conductivity of an insulating material, the
temperatures were measured on both sides of a flat slab of 25 mm of
the material and were 318.4 and 303.2 K. The heat flux was measured
as 35.1 W/m^2. Calculate the thermal conductivity in
btu/h*ft*Fahrenheit and in W/m*Kelvins

Why does the conductivity of a semiconductor increase with
increased temperature, but a metal’s conductivity decreases?

How to the four techniques of measuring salinity (evaporation,
electrical conductivity, refractometer, titration) compare to each
other? What are the pros and cons of each technique?

Measuring the electrical conductivity of a solution. Ammonia
solution is added from a burette to 50.0 cm3 of hydrochloric acid
in a beaker. When the NH3 is added to the solution, the
conductivity decreases until 20 cm3 of NH3 is added. The ammonia
solution has a density of 0.075 g cm-3 and contains 40% by mass of
ammonia. Find the molarity of the hydrochloric acid.

5. (a) Calculate the conductivity of intrinsic Si at room
temperature. (b) Calculate the conductivity of Si doped at
Nd=1017/cm3. (c) Calculate the
conductivity of Si doped at
Na=1017/cm3. (d) Why are the
results different and does this result suggest electron or hole
dope Si may be preferred for some devices? (e) Calculate the
position of the Fermi energy of the three cases described in (a)
–(c).

what is the purpose of determining the degree of polymerisation
in microcrystalline cellulose raw material in the formulation of
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why thermal conductivity decreases when the temperature
difference increases

To determine the effect of the temperature dependence of the
thermal conductivity on the temperature distribution in a solid,
consider a material for which this dependence may be represented
by: k = k0 + a T, where “k0“ is a positive constant and “a” is a
coefficient that may be positive or negative. Starting with a
steady-state energy balance, derive a relationship for temperature
(T) as a function of distance (x) from the lower temperature wall.
You may assume that...

Experimental investigation determining the thermal conductivity
for three different materials, silver painted zincalume, acrylic
and black timber. Expected that zincalume would have the highest
conductivity followed by acrylic and then timber (best
insulator).
Results found the opposites where timber had the highest
conductivity (k= 0.317) then acrylic (k=0.307) and zincalume
(k=0.303)
How do I scientifically explain these results using the theory
of heat transfer?

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