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.
Prior to 1983, pennies were made almost entirely of copper. If the scrap value of copper is $3.81 per pound, and each penny contains 2.95 g of copper, what is the scrap value of 7159.0 pennies (i.e., having a face value of $71.59)? Note: selling currency for scrap is illegal in the U.S.!
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