What are the units for concentration?
cm3
mol
mol/dm3
What is the concentration of 0.5 moles of HCl dissolved in 250cm3 of solution?
0.002 mol/dm3
0.02 mol/dm3
2 mol/dm3
What is the concentration in g/dm3 of a solution of H2SO4 with a concentration of 0.25 mol dm3? (Ar of H = 1, Ar of S = 32, Ar of O = 16)
0.003 g/dm3
24.5 g/dm3
392 g/dm3
Which of the following statements about a burette is correct?
It is used to add small, measured volumes of one reactant to the other reactant
It is used to accurately measure the volume of a reactant before transferring it to a conical flask
It can be used to digitally measure the pH of a substance
Where should the meniscus be in relation to a calibration mark on glassware like a pipette or burette?
The top of the meniscus on the line
The middle of the meniscus on the line
The bottom of the meniscus on the line
Which of the following is the correct colour change for phenolphthalein indicator when there is acid in the burette and alkali in the conical flask during a titration?
Pink -> colourless
Colourless -> pink
Yellow -> pink
In a titration, 25.0 cm3 of 0.5 mol/dm3 sodium hydroxide solution are exactly neutralised by 32.6 cm3 of a dilute solution of hydrochloric acid. Calculate the concentration of the hydrochloric acid solution.
0.192 mol/dm3
0.383 mol/dm3
1.53 mol/dm3
One mole of any gas occupies what volume at 20oC and 1atm?
2.4 dm3
24 cm3
24 dm3
In the reaction of hydrogen with oxygen forming water, 2H2(g) + O2(g) -> 2H2O(l), what volume of oxygen would react with 100 cm3 of hydrogen.
50 cm3
100 cm3
200 cm3
Using the equation, calculate the atom economy of reduction of iron(III) oxide using carbon, where iron is the desired product.
2Fe2O3 + 3C -> 4Fe + 3CO2
15.7%
62.9%
100%