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Intro to Chemistry, Basic Concepts - Periodic Table,
Elements, Metric System & Unit Conversion
In this video, we will be going over some of the basic topics that you need
to know if you are about to take a chemistry course
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In the next column, we have elements such as
beryllium, magnesium, calcium, and strontium
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Group 1 to 2a then groups 13 to 18 are known as
representative elements
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Nitrogen likes to form a minus three charge, and the same is true for
phosphorus when it has a negative three charge it is called phosphite
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The noble gases are chemically
inert and they are very stable; they do not usually participate much in
chemical reactions
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In chemistry, silicon and germanium are the most common metalloids that
you'll be tested on
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They
can be drawn into wires
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Sodium has
one valence electron and chlorine has seven valence electrons
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Chlorine
on the other hand becomes a negatively charged anion
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Well like charges repel but opposite
charges attract
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When you have a molecule that contains only carbon and hydrogen atoms,
it's a nonpolar molecule
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In the nucleus of an atom, helium has a mass of four and an atomic
number of two
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However, helium has two protons, two neutrons, and

helium only has two electrons
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Since helium is neutral, it doesn't have a charge
and therefore there are nine electrons in an atom of arsenic
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The most common two carbon isotopes are carbon 12 and carbon 13
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Carbon 13 has seven
neutrons and carbon 12 has six neutrons
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Carbon 13
has a mass of 13, but a percentage of 0
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In nature or on Earth, what percentage of boron atoms is the b10
isotope and what percentage is b11 isotope? Consider the following
elements: iron metal, magnesium, bromine, aluminum, and lithium
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What do you
think the answer is?
Helium is composed of atoms, and the noble gases are chemically stable
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The only element that does not conduct
electricity is the nonmetal chlorine (which is diatomic as cl2)
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I'm going to give you a quiz
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What is the difference between a pure substance and a
mixture? A mixture is simply the combination of two or more pure
substances
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One mile is equal to 5280 feet
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Feel
free to take notes in kilometers
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One meter is about 100 centimeters
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54
centimeters
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One month is approximately 30 days
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An hour is 60 minutes
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One mile is
equal to 5280 feet and one mile is 1
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To convert from

kilometers to miles, we need to divide the number by 1,600
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To
convert from miles to feet, we just need to multiply the number by 1
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So, if we have 200 miles, we would multiply it by 1
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1 feet
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Let's convert micrometers into meters and then meters to centimeters
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Convert micro is 10 to negative 6 so 1 micrometer is 1 times 10 to the
negative 6 meters since he is
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An 8
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1 milliliters of water
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The equation for
density is mass divided by volume
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