Physical Chemistry Answers

what is ligands?

25cm³ of 0.7 M HCl acid solution was added to 25cm³ of 0.7 M KOH solution in a calorimeter. The temperature of the mixture rose from 19.7⁰c to 21.8⁰c,given that the heat of the calorimeter and its content is 488j/K. Calculate the standard enthalpy of neutralization, given that the specific heat capacity of solution is 4.2 J per grams per degree Celsius

As a sample of bismuth-210 decays, the sample is transformed into a mixture of bismuth-210 and other isotopes in its decay chain. The time needed for the amount of the other isotopes to reach a certain percent of the sample can be obtained from the logarithmic model for bismuth-210 by replacing pin the function's rule. Write a function that gives the time t needed for the amount of the other isotopes to reach p percent of the sample.

 Strontium forms a face centered cubic unit cell and has a density of 2.64 g/cm³. What is the radius of a strontium atom?

4. You have 20ml of a concentrated plant extracts, how much water will you add to produce a 1:5 dilution

5. What will be the dilution factor if you added 195ml water to 5ml of a concentrated plant extract.

2. A solution of sodium chloride was prepared by dissolving 70g 250ml of distilled water.

a) Calculate the concentration of the solution which was made by dissolving 120g of in 250ml in distilled water

b) Calculate how much of this solution you will need to make up 500ml of 200mM NaCL

You are told you need to prepare 300ml of 20M NaOH stock solution. How would you go about this show calculations and give explanations

How many grams of nitrogen gas are present in a 65.0 L gas cylinder at 25oC and 1 atm pressure?