Physical Chemistry Answers

2𝑁𝑎 + 𝐻₂ → 2𝑁𝑎𝐻

If 10 grams of 𝑁𝑎 reacts with 8 grams of 𝐻₂, how many grams of the product will be formed? Which reactant is limiting? 

A gas expands from 12m3 to 14m3, against a constant pressure of 1 bar, at 298 K. What is the work done on the gas

A colloidal solution of AgI is prepared by two different methods shown in figure: What is the name of the process when two colloidal solutions obtained in two test tubes (A) and (B) are mixed together?

aluminum-27 absorbs an electron to form magnesium-27

ΔH and ΔS for a certain reaction are 10 kJ mol^-1 and 10 J K^-1 mol^-1 respectively. What is ΔG in kJ mol^-1 at 400 K? 

Under certain circumstances, ΔG for reaction (1) is -13.4 kJ mol^-1. Indicate whether the reaction equilibrium favours the products or the reactants. 

Given that at body temperature, Kw = 10^-13.6, what is the pH of neutral water at body temperature? 

The volume of gastric fluid in your stomach is 100 cm3 and its pH = 2. Calculate the number of H+ ions in your stomach. You need to know that Avogadro’s Number, NA, is 6.02*1023 mol^-1. 

A catalyst (e.gg an enzyme) speeds up a reaction by changing (tick one or more of these options): 

a) the heat of reaction 

b) the energy of activation 

c) the frequency of collisions of reactant molecules 

d) the frequency of successful collisions

Which of the following solutions (of similar concentration) contains the weakest base? 

Their pH values are as follow: 

a) 6.00 

b) 7.00 

c) 13.00 

d) 8.00