Lead (II) chromate (PbCrO4) is used as the yellow pigment in traffic lanes, but it is banned form house paint because of the risk of lead poisoning. The PbCrO4 is produced from chromite, FeCr2O4, an ore of chromium, first by the following reaction 4 FeCr2O4(s) + 8 K2CO3 (aq) + 7 O2(g) → 2 Fe2O3(s) + 8 K2CrO4(aq) + 8 CO2(g) and then the K+ in the K2CrO4 is replaced by the lead (II) ion. If a yellow paint is 0.518 % PbCrO4 by mass, how many grams of the chromite, FeCr2O4, is needed per kilogram of paint? Molar masses: PbCrO4 = 323.2 g mol-1 FeCr2O4 = 223.9 g mol-1
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Lead (II) chromate (PbCrO4) is used as the yellow pigment in traffic lanes, but it is banned form house paint because of the risk of lead poisoning. The PbCrO4 is produced from chromite, FeCr2O4, an ore of chromium, first by the following reaction
4 FeCr2O4(s) + 8 K2CO3 (aq) + 7 O2(g) → 2 Fe2O3(s) + 8 K2CrO4(aq) + 8 CO2(g)
and then the K+ in the K2CrO4 is replaced by the lead (II) ion. If a yellow paint is 0.518 % PbCrO4 by mass, how many grams of the chromite, FeCr2O4, is needed per kilogram of paint?
Molar masses: PbCrO4 = 323.2 g mol-1 FeCr2O4 = 223.9 g mol-1
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