what are two experimental considerations when running PXRD (powder X-ray diffraction) using a flat disk sample holder? And why is the scan time and 2theta range important parameters in the experiment?

in an experiment, 60g of ice at -18C is mixed with 9g of steam at 130C (at 1 atm pressure). Neglecting any heat exchange with the surrounding.

(a)Determine the final state of the mixture.

(b) Determine the final temperature.

while transferring the weighed salt to the test tube during the experiment, a student spilled some.Will this salt loss result in calculated salt solubilities that are too high, too low, or unchaged? briefly explain.

What are some explanations for a yield going above 100%? Referring specifically to a yield produced when re-using products from a previous experiment (re-using recovered NaI to produce CuI).

A magnetic field with induction B = 15 · 10−4T is directed perpendicular to the electric field with intensity E = 10V /cm. The beam of electrons flying at the speed v enters the space with the mentioned fields. The velocity of the electrons is perpendicular to the plane containing the vectors E and B. Calculate: 1) the electron velocity v, if the electron beam does not deviate under the simultaneous action of both fields; 2) the radius of curvature of the electron trajectory when only the magnetic field is on. 3) What is the kinetic energy of the electron in both cases?

3) Solve the initial value problems

c) R′ + (R/t) = (2/(1+t² )) , R(1) = ln 8.

e) ) cos θv′ + v = 3 , v(π/2) = 1.

5) Express the general solution of the equation x ′ = 2tx + 1 in terms of the erf function.

7) Solve x ′′ + x ′ = 3t by substituting y = x ′

9) Find the general solution to the differential equation x ′ = ax + b, where a and b are constants, first by separation of variables, and second by integrating factors

A three phase 30 hp 460 volt 60 hz, 1770 rpm design B induction motor with class F insulation and service factor of 1.0 is operating at rated shaft load in a 40 degree C environment and has an expected 20 yr life. A maintenance check shows line to line voltages to be 449.2 V, 431.3 V and 462.4 volts. The percent unbalanced voltage for this motor is:

the expected temperature rise equals?

The expected insulation life equals?

the rerating in horsepower equals?

Anna dissolves 32. grams of glucose with water and the final volume of solute and solvent is 122. mL. What is the concentration of glucose in her solution using the %(m/v) method? Amanda dissolves 0.14 moles of NaCl in 300 ml of solution. What is the concentration of NaCl in the solution using the molarity method? Remember that 1,000 mL = 1 Liter

Anna dissolves 32. grams of glucose with water and the final volume of solute and solvent is 122. mL. What is the concentration of glucose in her solution using the %(m/v) method

Consider a galvanic cell based on the following two half reactions at 298 K: SRP Fe3+ + e-  Fe2+ 0.77 V Cu2+ + 2 e-  Cu 0.34 V How many of the following changes will increase the potential of the cell? Why?

1. Increasing the concentration of Fe+3 ions

2. Increasing the concentration of Cu2+ ions

3. Removing equal volumes of water in both half reactions through evaporation

4. Increasing the concentration of Fe2+ ions

5. Adding a NO3 - solution to the anode portion of the cell