The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U.S. half dollars would be in a stack of the same height? Each half dollar is 2.15 mm. number of half dollars: Each half dollar has a mass of 11.340 g. How much would the stack of half dollars from the previous question weigh? mass in g: What is the value, in dollars, of the same stack of half dollars? value in dollars: The 2017 U.S. gross domestic product (GDP) was valued at 19,390,604,000 dollars. How many Gateway Arch‑height stacks of half dollars are needed to match the GDP in value? number of stacks:
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.
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