Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solution on the left.

A. 4.0×10⁻²M Ba(NO3)2;NaF
B. 8.5×10⁻²M CaI2;K2SO4
C. 1.8×10⁻³M AgNO3;RbCl

1. Determine the pH of the buffer solution that is prepared by mixing 259 mL of 0.0983 M BIS−TRIS propane−H (C11H27N2O6+ ) to 855 mL of 0.0729 M BIS-TRIS_propane (C11H26N2O6) ). Assume the 5% approximation is valid. Report your answer to 2 decimal places. The pKa of BIS−TRIS propane−H is 9.10. Submit Answer Tries 0/3 2. Determine the pH of the BIS−TRIS propane−H/BIS−TRIS propane buffer solution after the addition of 25.2 mL of 0.643 M solution of rubidium hydroxide to the existing buffer solution. Assume the 5% approximation is valid.

What are two most well-known "Bands" in traditional or classic (inorganic) semiconductors? For most organic materials, scientists typically do not use those " Bands" and instead using different but similar names, what are those name, and explain the differences and similarities between organics verus inorganic semiconductors inters of thoses names

Which of the following bonds would be the most polar? a. N--P b. N--Al c. N--Ga d. N--Si e. N--C

What is the pH of a saturated strontium hydroxide solution?

The pH gradient established by the electron transport chain in photosynthesis:

a.)  Exists between the matrix and the mitochondrial intermembrane space

b.)  Sets up a voltage gradient that drives GTP formation

c.)  Is established by electron transfer from FADH2 and NADPH from the TCA
cycle to oxygen

d.)  Occurs in part because Fe-S clusters can only transport electrons and not protons

e.)  None of the above 

All surface probe microscopy (SPM) techniques involve a probe which interacts with a sample surface. Atomic Force Microscopy (AFM) and Scanning Transmission Microscopy (STM) are two SPM techniques that operate on the basis of different fundamental principles, though they have many similar aspects. Describes the underlying principles of AFM and STM for measuring surfaces

The Sun delivers roughly 1 kW m−2 of power to the Earth's surface. A parabolic mirror with a 1 m radius is used to focus this energy onto a beaker containing 1 L of water. Estimate the time taken by the mirror to raise the temperature of the water by 50∘C, assuming the specific heat capacity of water to be 4200 J K−1 kg−1 and ignoring energy losses to the surroundings

1)A 55.67 g sample of a substance is initially at 22.7 °C. After absorbing 2847 J of heat, the temperature of the substance is 132.2 °C. What is the specific heat (c) of the substance?

2)An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 7785 J. What is the specific heat of the gas?

3)How much work must be done on a system to decrease its volume from 13.0 L to 5.0 L by exerting a constant pressure of 4.0 atm?

4)If a system has 5.00 × 102 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its surroundings, what is the change in internal energy of the system?

Find the pH of the following solutions: a mixture of 10.0 mL NaOH solution having pH 11.00 and 10.0 mL HClO4 having pH 1.00.

2.) Using activities calcalute the pH and concentration of H+ in pure water containing 0.05 M CaCl2 at 25 degrees C

The following data were obtained for the concentration vs. time for a certain chemical reaction. Values were measured at 1.0 s intervals, beginning at 0.00 and ending at 20.0 s. Concentrations in mM are:
10.00, 6.91, 4.98, 4.32, 3.55, 3.21, 2.61

2.50, 2.22, 1.91, 1.80, 1.65, 1.52, 1.36
1.42, 1.23, 1.20, 1.13, 1.09, 1.00, 0.92
a) Plot concentration, c, vs. time, t, ln c vs. t, and 1/c vs. t.
b) Decide whether the data best fit zero-order, first-order or second-order kinetics and calculate the rate constant (with units (!!!)).

Describe three types of charge transfer transitions that are possible in theromocromatic complexes

Complete this table of values for four aqueous solutions at 25