a cool day the beach Isabella ants to propose to her boyfriend, she has a sign that reads, "Will you marry me?". The sign weighs 21.2 lbs. To carry the sign into the air Isabella fills 2 balloons with Helium gas. How many liters of helium must Isabella fill each balloon with? (453.6 g = 1 lb) The buoyancy of He is the difference between the density of helium and the density of air (whose weighted average molar mass can be calculated from the gasses that make it up and their % (N₂ = 78%, O₂ = 21%, Ar = 1%). HINT: calculate the mass in grams Helium can lift.

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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.