General Chemistry Answers

Balance the each of the following half-reactions and write the net-equation               

Al3+ (aq) + 3e- → Al (s)     and   Sn2+ (aq) + 2e- → Sn(s)

Pros and cons of acid and base

The heat of dissolution of a solid substance was determined using an insulated calorimeter containing 180 grams of water initially at 27.8°C. If the temperature of the water increased to 36.5°C, what is the heat (in J) of dissolution of the solid?

What properties must a compound have to make it suitable for use as a primary standard?

For BCA estimation, 50: 1: Solvent A: Solvent B of working reagent is required. How much solvent A and solvent B will you take for a total volume of 5mL?

You have to dilute chemical X 5 times (i.e. 1:5 dilution) for 200µL. How much chemical X and solvent will you take?

Determine the ΔS system given the reaction : 

       C6H12O6 (s) + O2(g) --------------→ CO2 (g) + H2O(l)

In that problem, is R a know value that never changes?

A gas occupies a volume of 31.0L at 17.0⁰C. If the gas temperature rises to 34.0⁰C at constant pressure, would you expect the volume to double to 2.0L?

A sample of a gas occupies 75.0mL at 0.400atm. If the temperature remains constant, a.)what volume would the gas occupy at 4.00atm? b.) How about 0.00400 atm? (Note: 1atm = 1.01325 x10⁵ Pa)