A student observed the reactions when sodium chloride and sodium iodide were each reacted separately with concentrated sulfuric acid and with concentrated phosphoric acid. Some observations are recorded in the table. sodium chloride with conc. H2SO4: colourless acidic gas formed sodium chloride with conc. H3PO4: colourless acidic gas formed sodium iodide with conc. H2SO4: purple vapour formed sodium iodide with conc. H3PO4: colourless acidic gas formed Which deduction can be made from these observations?

Chlorine reacts with hot aqueous sodium hydroxide. Which oxidation states does chlorine show in the products of this …

Under standard conditions, which statement is correct?

Hot aqueous sodium hydroxide reacts with chlorine. 6NaOH(aq) + 3Cl2(g) → 5NaCl(aq) + NaClO3(aq) + 3H2O(l) Which state…

A sample of gas occupies 240 cm³ at 37 °C and 100 kPa. How many moles of gas are present in the sample?

The standard enthalpy changes of combustion of carbon, hydrogen and methanol are shown. C(s) + O₂(g) → CO₂(g) ∆Hᶜ = −…

The equation for a chemical reaction is shown. All substances are in their standard states. XeF₆ + 3H₂O → XeO₃ + 6HF …