A: barium carbonate
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Dolomite is a double carbonate, CaMg(CO₃)₂, and can be used instead of calcium carbonate for treating acidic soils. T…
A reaction scheme for a Group 2 metal, M, is shown. M --(reacts with oxygen)--> X --(reacts with water)--> Y --(react…
River water in an agricultural area contains NH4⁺, CO3²⁻, HCO3⁻, Cl⁻ and NO3⁻ ions. This water is treated by adding a…
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 …