Zadania z chemii IB SL

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Filtry i umiejętności2

State the SI-derived unit used to measure the size of the current flowing through the bulb.

A student compiles data on the solubility of bromine in water at different temperatures from several websites and textbooks. Source Temperature / °C Solubility of bromine A 5 3.90 g per 100 $\mathrm{cm^3}$ of water B 15 1.15 $\mathrm{cm^3}$ of liquid bromine…

Suggest why hot-tub owners rarely add bromine itself to the water and instead use solid tablets that release HOBr.

The iron(II) concentration is found by titrating against a standard solution of potassium manganate(VII), $\ce{KMnO4}$ . At intervals of a few days, a 20.00 $\mathrm{cm^3}$ sample is withdrawn from each flask and made up to 250.0 $\mathrm{cm^3}$ with water;…

The following readings are recorded during one titration. Final burette reading = $23.20 \pm 0.05\ \mathrm{cm^3}$ Initial burette reading = $3.20 \pm 0.05\ \mathrm{cm^3}$ Calculate the percentage uncertainty in the volume of $\ce{KMnO4}$ solution delivered…

The student's results are shown in the graph. (i) Calculate the average rate at which the iron(II) concentration fell in the 24 h flask during the 21 days. Include units. (ii) Before starting, the student proposed the hypothesis: "The longer a solution is left…