1. Prepare 1 mmol/L Lithium standard from lithium carbonate (Li2CO3). Give the quantity in mg/L.

2. If 3 mL of a 100 mcg/mL is diluted to 100 mL. What is the concentration in mg/dL?

3. Prepare 1L of 0.06M NaOH (FW 40) solution from 1N stock solution.

4. Prepare 2L of 0.85% (W/V) NaCl (FW 58).

5. Prepare a 5% W/V calcium chloride solution from CaCl2 * 6H2O (FW 219).

Determine the thermodynamic state of 1,1,1,2-Tetrafluoroethane (R-134a) at 102 °C and 1000 kPa. Critical Pressure= 4.059 MPa, Critical Temperature = 101.06°C.

*I keep getting stuck with a quadratic equation and two volume values, when using the van der Waals equation of state (P=(RT/(V-b))-(a/V^2))....I am determining the thermodynamic state by finding if the compressibility factor (z) is less than or greater than 1, to find if attractive or repulsive forces dominate.

Calculate the equilibrium potential of a copper wire immersed in 0.0005 M CuSO4 solution. The standard electrode potential for the reaction Cu2+ + 2e- = Cu0 at 25°C is 0.34 V (NHE). Now, answer the following questions and enter your results (numerical number only). Calculate the ionic strength (M) of the solution. 2.0×10-3 You are correct. Calculate the activity coefficient of Cu2+. 0.82 You are correct. Calculate the equilibrium potential (v) of the copper wire electrode. Note: use activity instead of concentration.

A piston–cylinder device initially contains 2 kg water in 1 m3 at 500 kPa. The system then cools down and the volume drops to half and pressure of 300 kPa. At this state, the piston is resting on a set of stops, and the mass of the piston is such that a pressure of 500 kPa is required to move it. (a) Show the process on a P-v, T-v and P-T diagrams with respect to saturation lines and determine, (b) the final temperature, (c) the work done during this process, and (d) the total heat transfer. full step plz

Consider the following standard reduction potentials,

For the voltaic cell reaction below, calculate the Fe2+ concentration that would be needed to produce a cell potential equal to 0.16 V at 25 oC when the pH of the solution is 13.00, [Fe3+] = 0.50 M and [H2O2] = 0.35 M.

2 Fe2+(aq) + H2O2(aq) → 2 Fe3+(aq) + 2 OH‒(aq)

1. Calculate the permeability of electrons with energy of 0.1 eV and 0.5 eV respectively when penetrating a positional energy barrier of 1.0 eV in height and 100 pm in length by tunnel phenomenon.
k Attachment image=[2m(V-E)]^1/2
T={1+(e^kL-e^-kL)^2/16ε(1-ε)}^-1 (ε= E/V)
2. Explain the meaning of tunneling covered in the above problem with the wave and explain the difference between classical and quantum mechanics based on it.

16. Which of the following statements is false?

(a) Let S = {v1, v2, . . . , vm} be a subset of a vector space V with dim(V) = n. If m > n, then S is linearly dependent.

(b) If A is an m × n matrix, then dim Nul A = n.

(c) If B is a basis for some finite-dimensional vector space W, then the change of coordinates matrix PB is always invertible.

(d) dim(R17) = 17.

(e) If B1 and B2 are both bases for the same vector space, then B1 and B2 have the same number of vectors.

1)What potential difference is needed to stop an electron that has an initial velocity v=7.0×105m/sv=7.0×105m/s?

2)How strong is the electric field between the plates of a 0.80-μFμF air-gap capacitor if they are 3.0 mmmm apart and each has a charge of 72 μCμC ?

3)A 3700-pFpF air-gap capacitor is connected to a 30-V battery.If a piece of mica (K= 7) is placed between the plates, how much charge will flow from the battery?

How to shorten this "if-else" statements in R studio? Thank you sooo much!

fizzbuzz = function(v = NULL){
for (term in v){
if (is.infinite(term) != TRUE){
if (is.numeric(term)){
if (term == as.integer(term)){
if (term %% 3 == 0){
if (term %% 5 == 0){
print("FizzBuzz")}
else {
print("Fizz")
}
}
else if (term %% 5 == 0){
print("Buzz")
}
else {
print(term)
}
}
else {
print ("This number is not an integer.")
}
}
else {
print ("This is not a number, or this number was entered as a string.")
}
}
else {
print ("You must enter an integer for this function to work.")
}
}
}

Public health emphasizes the importance of safe home, work, and community environments. Reliable access to clean drinking water, a toilet, and fuel is critical for human health. Minimizing exposure to hazards and injuries at work is is also essential for safety and well-being. Watch the TED Talk video (the link is provided below), and discuss in this forum the related issues. Feel free to share with us your thoughts and give your personal examples and observations.

https://www.youtube.com/watch?v=FKBVwX8dVhI

https://www.youtube.com/watch?v=LlQXs0yofMs