Zadania z chemii IB HL

Bathers release nitrogen-containing compounds, including ammonia, into the pool water. Ammonia reacts with hypochlorous acid to form chloramines. (i) Deduce an equation for the reaction of ammonia with hypochlorous acid that forms trichloramine,…

Some users have asked for the water to be heated in winter. Suggest two reasons why leaving the water unheated is the better choice for the environment.

Determine the empirical formula of HA from the percentage composition.

A solution is prepared by dissolving 1.29 g of HA in water and making the volume up to $20.00\ \mathrm{cm^3}$. When the whole of this solution is titrated with $0.600\ \mathrm{mol\,dm^{-3}}$ sodium hydroxide, NaOH(aq), exactly $24.90\ \mathrm{cm^3}$ of the…

State the molecular formula of HA, using your answers to (a) and (b).

HA reacts with aqueous sodium carbonate according to the equation: $\ce{2HA(aq) + Na2CO3(aq) -> 2NaA(aq) + CO2(g) + H2O(l)}$ Identify the functional group in HA that is responsible for this reaction.

The IR spectrum of HA is shown. Two absorption bands are labelled: Y is a very broad band centred near $3000\ \mathrm{cm^{-1}}$ and Z is a band of medium intensity near $1650\ \mathrm{cm^{-1}}$. (i) Using section 20 of the data booklet, identify the functional…

Heavy water, $\ce{^{2}H2O}$, boils at 101.4 °C, whereas ordinary water, $\ce{^{1}H2O}$, boils at 100.0 °C at the same pressure. Which statement is correct? A. The boiling points differ because $\ce{^{2}H2O}$ molecules have a greater mass, while the chemical…

Identify two controlled variables in this investigation.