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.
Be clear/specific/detailed
![What evidence of chemical change might you expect to observe from this reaction?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4840bccc-df4f-4123-9456-49a5ffddf0b1%2F9e9d5149-16df-4b54-a038-9119cb6370b4%2Fna4baz_processed.png&w=3840&q=75)
![A Chemical Change & Conservation Scenario
When heated, calcium hydroxide and ammonium chloride react to produce ammonia
gas, water vapor, and solid calcium chloride according to the chemical equation:
CaOH + NH4Cl ==> NH3 + H₂O +CaCl₂
Suppose 5.00 g of calcium hydroxide and 10.00 g of ammonium chloride are mixed in
a test tube and heated until no more ammonia is given off.
The remaining material in the test tube has a mass of 1.27 g.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4840bccc-df4f-4123-9456-49a5ffddf0b1%2F9e9d5149-16df-4b54-a038-9119cb6370b4%2Fkktrcc_processed.png&w=3840&q=75)
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