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.
2 ZnS + 3 O2 --> 2 ZnO + 2 SO2
a) Determine the mass of zinc oxide that should be produced in the reaction between 46.5 g of zinc sulfide and 13.3 g of oxygen gas.
b) Identify the limiting reactant and the excess reactant.
c) Calculate the percent yield for the reaction if 18.5 grams of zinc oxide are actually recovered after filtration.
d) How much of the excess reactant is left over?
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