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Material Type: Notes; Professor: Espino; Class: Intro Physics Surv; Subject: Physics (PHYS); University: East Tennessee State University; Term: Unknown 1989;
Typology: Study notes
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Water is made up of hydrogen and oxygen, so
water cannot be an element.
Substances made up of more than one element
are called chemical compounds.
Water H 2 O
Salt NaCl
Chemical compounds can be split up into smaller
and smaller pieces. The smallest particles of a
compound that still retains the properties of the
compound is called a molecule.
Macroscopic – phenomena that can be easily
observed. Occurs on a ‘large’ scale. Temperature is macroscopic. When you smell something, a macroscopic observation occurs.
Microscopic – occurs on a very small scale. An
unseen level for humans. The speed of the individual atoms that results in the given temperature is microscopic. The atoms that produce the smell can be studied microscopically.
solid – has fixed shape, fixed volume, molecules are close to together and locked in fixed arrangement, hardest to compress
liquid – has fixed volume, does not have a fixed shape. Think about pouring water into different shaped cups. Molecules are close to together but not rigidly fixed to each other, hard to compress
gas – no fixed shape, no fixed volume (gas expands to fill the container it is in), molecules are relatively far away. Gases can be compressed.
TN is about 500 miles long
1 mile about 1.6 km
So TN is about 800 km long.
Reach of a person is about 1 meter.
800km is 800*1000 meters.
You would need about 800 000 people.
Any rearrangement of molecules to produce different molecules is called a chemical reaction.
example: burning, respiration, photosynthesis
Conservation of matter- during any chemical reaction,
the total number of each type of atoms must stay constant.
C O 2 CO 2
In this reaction the number of each atom types is
not balanced.
Chemical reactions need to be balanced, that way
the conservation of matter rule is held true.
Now the are equal numbers of each type of atom
on both sides of the equation.